@inproceedings{OPUS4-3785, title = {30. Forum Bauinformatik}, editor = {Steiner, Maria and Theiler, Michael and Mirboland, Mahsa}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20180917-37854}, pages = {424}, abstract = {Die Bauhaus-Universit{\"a}t Weimar ist seit langer Zeit mit dem Forum Bauinformatik eng verbunden. So wurde die Veranstaltung 1989 hier durch den Arbeitskreis Bauinformatik ins Leben gerufen und auch das 10. und 18. Forum Bauinformatik (1998 bzw. 2006) fand in Weimar statt. In diesem Jahr freuen wir uns daher besonders, das 30. Jubil{\"a}um an der Bauhaus-Universit{\"a}t Weimar ausrichten zu d{\"u}rfen und viele interessierte Wissenschaftler und Wissenschaftlerinnen aus dem Bereich der Bauinformatik in Weimar willkommen zu heißen. Das Forum Bauinformatik hat sich l{\"a}ngst zu einem festen Bestandteil der Bauinformatik im deutschsprachigen Raum entwickelt. Dabei steht es traditionsgem{\"a}ß unter dem Motto „von jungen Forschenden f{\"u}r junge Forschende", wodurch insbesondere Nachwuchswissenschaftlerinnen und ‑wissenschaftlern die M{\"o}glichkeit geboten wird, ihre Forschungsarbeiten zu pr{\"a}sentieren, Problemstellungen fachspezifisch zu diskutieren und sich {\"u}ber den neuesten Stand der Forschung zu informieren. Zudem wird eine ausgezeichnete Gelegenheit geboten, in die wissenschaftliche Gemeinschaft im Bereich der Bauinformatik einzusteigen und Kontakte mit anderen Forschenden zu kn{\"u}pfen. In diesem Jahr erhielten wir 49 interessante und qualitativ hochwertige Beitr{\"a}ge vor allem in den Themenbereichen Simulation, Modellierung, Informationsverwaltung, Geoinformatik, Structural Health Monitoring, Visualisierung, Verkehrssimulation und Optimierung. Daf{\"u}r m{\"o}chten wir uns ganz besonders bei allen Autoren, Co-Autoren und Reviewern bedanken, die durch ihr Engagement das diesj{\"a}hrige Forum Bauinformatik erst m{\"o}glich gemacht haben. Wir danken zudem Professor Große und Professor D{\´i}az f{\"u}r die Unterst{\"u}tzung bei der Auswahl der Beitr{\"a}ge f{\"u}r die Best Paper Awards. Ein herzliches Dankesch{\"o}n geht an die Kollegen an der Professur Informatik im Bauwesen der Bauhaus-Universit{\"a}t Weimar f{\"u}r die organisatorische, technische und beratende Unterst{\"u}tzung w{\"a}hrend der Planung der Veranstaltung.}, subject = {Bauinformatik}, language = {de} } @inproceedings{OPUS4-2451, title = {International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering : July 20 - 22 2015, Bauhaus-University Weimar}, series = {Digital Proceedings, International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering : July 20 - 22 2015, Bauhaus-University Weimar}, booktitle = {Digital Proceedings, International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering : July 20 - 22 2015, Bauhaus-University Weimar}, editor = {G{\"u}rlebeck, Klaus and Lahmer, Tom}, organization = {Bauhaus-Universit{\"a}t Weimar}, issn = {1611-4086}, doi = {10.25643/bauhaus-universitaet.2451}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20150828-24515}, pages = {230}, abstract = {The 20th International Conference on the Applications of Computer Science and Mathematics in Architecture and Civil Engineering will be held at the Bauhaus University Weimar from 20th till 22nd July 2015. Architects, computer scientists, mathematicians, and engineers from all over the world will meet in Weimar for an interdisciplinary exchange of experiences, to report on their results in research, development and practice and to discuss. The conference covers a broad range of research areas: numerical analysis, function theoretic methods, partial differential equations, continuum mechanics, engineering applications, coupled problems, computer sciences, and related topics. Several plenary lectures in aforementioned areas will take place during the conference. We invite architects, engineers, designers, computer scientists, mathematicians, planners, project managers, and software developers from business, science and research to participate in the conference!}, subject = {Angewandte Informatik}, language = {en} } @article{Abdalla2004, author = {Abdalla, Jamal}, title = {Elements of an Agent-based Mediative Communication Protocol for Design Objects}, doi = {10.25643/bauhaus-universitaet.220}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2207}, year = {2004}, abstract = {Integrated structural engineering system usually consists of large number of design objects that may be distributed across different platforms. These design objects need to communicate data and information among each other. For efficient communication among design objects a common communication protocol need to be defined. This paper presents the elements of a communication protocol that uses a mediator agent to facilitate communication among design objects. This protocol is termed the Mediative Communication Protocol (MCP). The protocol uses certain design communication performatives and the semantics of an Agent Communication language (ACL) mainly the Knowledge and Query Manipulation Language (KQML) to implement its steps. Details of a Mediator Agent, that will facilitate the communication among design objects, is presented. The Unified Modeling Language (UML) is used to present the Meditative protocol and show how the mediator agent can be use to execute the steps of the meditative communication protocol. An example from structural engineering application is presented to demonstrate and validate the protocol. It is concluded that the meditative protocol is a viable protocol to facilitate object-to-object communication and also has potential to facilitate communication among the different project participants at the higher level of integrated structural engineering systems.}, subject = {Mehragentensystem}, language = {en} } @inproceedings{Abramian1997, author = {Abramian, A. K.}, title = {Superelliptic Shells as new constructive Forms}, doi = {10.25643/bauhaus-universitaet.434}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4347}, year = {1997}, abstract = {In the superelliptic shell joined to a circular cylinder bending stresses are absent when it is subjected to uniform pressure.Some geometrical characteristics have been found. Expressions for determining stresses in the shell crest(in the singular point of plane type) are suggested. The problem of a theoretical critical buckling load of an elongated shell supported by frames is studied. A critical buckling load for two shells with different specifications was found experimentally.}, subject = {Schale}, language = {en} } @inproceedings{AbramianLitvin2000, author = {Abramian, A. K. and Litvin, S.S.}, title = {AUTOPARAMETRIC STABILIZER OF OSCILLATION AMPLITUDE}, doi = {10.25643/bauhaus-universitaet.567}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5674}, year = {2000}, abstract = {A method of automatic maintenance of vibration amplitude of a number of mechanisms at given level, when exiting force amplitude is varied greatly is given. For this purpose a pendulum is attached to a mechanism through a viscoelastic hinge. Load of a pendulum can move along an arm and it is viscoelastic connected to it.}, subject = {Schwingung}, language = {en} } @inproceedings{AdamskiBryniarska1997, author = {Adamski, A. and Bryniarska, Z.}, title = {Schedule Synchronisation in public Transport by Tabu Search and Genetic Method}, doi = {10.25643/bauhaus-universitaet.414}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4146}, year = {1997}, abstract = {This paper concerns schedule synchronization problems in public transit networks. In particular, it consists of three main parts. In the first the subject area is introduced, the terms are defined and framework for optimal synchronization in the form of problem representation and formulation is proposed. The second part is devoted to transfer synchronization problem when passengers changing transit lines at transfer points. The intergrated Tabu Search and Genetic solution method is developed with respect to this specific problem. The third part deals with headways harmonization problem i.e. synchronization of different transit lines schedules on a common segments of routes. For the solution of this problem a new bilevel optimization method is proposed with zones harmonization at the bottom level and co-ordination of zones, by time buffers assigned to timing points, at the upper level. Finally, the synchronization problems are numerically illustrated by real-life examples of the public transport lines in Cracow.}, subject = {{\"O}ffentlicher Personennahverkehr}, language = {en} } @inproceedings{Ahler2003, author = {Ahler, Marco}, title = {Mobile Software-Agenten f{\"u}r neuartige Funktionen und Nutzeffekte in intelligenten Geb{\"a}udesystemen}, doi = {10.25643/bauhaus-universitaet.83}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-834}, year = {2003}, abstract = {Anwendungsbezogene Software innerhalb vernetzter Geb{\"a}ude nimmt immer mehr zu. Neue Standards erlauben den einfachen Fernzugriff, um neue Services zu installieren oder um Updates aufspielen zu k{\"o}nnen. Zu diesem Thema wird der OSGi-Standard vorgestellt, der ein Management von Software w{\"a}hrend des Betriebs vornehmen kann. Außerdem nimmt die Netzlast der heterogenen Netze innerhalb und zu den H{\"a}usern stetig zu. Hier k{\"o}nnen mobile Softwareagenten ihre Vorteile gegen{\"u}ber herk{\"o}mmlichen, statischen Kommunikationsmechanismen hervorheben. Im folgenden Text wird die Integration solcher mobilen Softwareagenten in bestehende Standards intelligenter H{\"a}user beschrieben und anhand des Innovationszentrum Intelligentes Haus Duisburg (www.inhaus-duisburg.de) beispielhaft erl{\"a}utert. Nach der Einleitung wird in Kapitel 2 der aktuelle Stand der Technik beschrieben. Dabei wird vor allem auf den OSGi-Standard und die Technik der mobilen Softwareagenten eingegangen. Im Kapitel 3 wird stehen vor allem Voranalysen zur Fernwartung, Optimierungen von Regelungen und die Integration dynamischer Netzteilnehmer im Vordergrund, die durch die beschriebenen Mechanismen erleichtert werden. Im Kapitel 4 werden die Ergebnisse kurz zusammengefaßt und einen Ausblick gegeben.}, subject = {Leitsystem}, language = {de} } @inproceedings{AlDiabHenryBoulemia2003, author = {Al Diab, Ali and Henry, Eric and Boulemia, Cherif}, title = {A concerted and multi-criterion approach for helping to choose a Structure- Foundation system of building}, doi = {10.25643/bauhaus-universitaet.273}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2732}, year = {2003}, abstract = {The research of the best building design requires a concerted design approach of both structure and foundation. Our work is an application of this approach. Our objective is also to create an interactive tool, which will be able to define, at the early design stages, the orientations of structure and foundation systems that satisfy as well as possible the client and the architect. If the concerns of these two actors are primarily technical and economical, they also wish to apprehend the environmental and social dimensions of their projects. Thus, this approach bases on alternative studies and on a multi-criterion analysis. In this paper, we present the context of our work, the problem formulation, which allows a concerted design of Structure and Foundation systems and the feasible solutions identifying process.}, subject = {Bauwerk}, language = {en} } @article{AlbertFreischladPullmann2004, author = {Albert, Andrej and Freischlad, Mark and Pullmann, Torben}, title = {Acquisition of Conceptual Design Knowledge in Structural Engineering}, doi = {10.25643/bauhaus-universitaet.215}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2154}, year = {2004}, abstract = {Expert systems integrating fuzzy reasoning techniques represent a powerful tool to support practicing engineers during the early stages of structural design. In this context fuzzy models have proved themselves to be very suitable for the representation of complex design knowledge. However their definition is a laborious task. This paper introduces an approach for the design and the optimization of fuzzy systems based upon Genetic Programming. To keep the emerging fuzzy systems transparent a new framework for the definition of linguistic variables is also introduced.}, subject = {Mehragentensystem}, language = {en} } @inproceedings{AldaCremersBilek2004, author = {Alda, Sascha and Cremers, Armin B. and Bilek, Jochen}, title = {Support of Collaborative Structural Design Processes through the Integration of Peer-to-Peer and Multiagent Architectures}, doi = {10.25643/bauhaus-universitaet.148}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1481}, year = {2004}, abstract = {Structural engineering projects are increasingly organized in networked cooperations due to a permanently enlarged competition pressure and a high degree of complexity while performing the concurrent design activities. Software that intends to support such collaborative structural design processes implicates enormous requirements. In the course of our common research work, we analyzed the pros and cons of the application of both the peer-to-peer (University of Bonn) and multiagent architecture style (University of Bochum) within the field of collaborative structural design. In this paper, we join the benefits of both architecture styles in an integrated conceptual approach. We demonstrate the surplus value of the integrated multiagent-peer-to-peer approach by means of an example scenario in which several structural engineers are co-operatively designing the basic structural elements of an arched bridge, applying heterogeneous CAD systems.}, subject = {Ingenieurbau}, language = {en} } @inproceedings{AldaCremersMeissner2003, author = {Alda, Sascha and Cremers, Armin B. and Meißner, Udo F.}, title = {Wahrnehmung und Verarbeitung von Ereignissen bei der verteilten Planung im baulichen Brandschutz}, doi = {10.25643/bauhaus-universitaet.1548}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-158}, year = {2003}, abstract = {Der Bauplanungsprozess ist durch ein hohes Maß an Kooperation zwischen Planungsbeteiligten verschiedener Fachrichtungen gekennzeichnet. Hierbei werden zum einen Planungen auf der Basis von Planungsinformationen anderer Planungsbeteiligter detailliert, zum anderen geben Planungen einzelner auch wichtige Rahmenbedingungen f{\"u}r die Gesamtplanung vor. Der vorliegende Beitrag beschreibt einen Ansatz zur ganzheitlichen Unterst{\"u}tzungen verteilter Planungen am Beispiel des baulichen Brandschutzes. Der Antrag tr{\"a}gt hierbei der verteilten und parallelen Planung Rechnung, wie sie heute bei der Planung großer und mittlerer Bauwerke angewendet wird. Die Verteiltheit wird nicht nur f{\"u}r die Planungsbeteiligten modelliert, sondern auch die einzelnen Planungsinformationen liegen im gemeinsamen Kooperationsverbund verteilt vor. Der Fokus dieses Beitrags liegt auf der Wahrnehmung von Planungs{\"a}nderungen und Ereignissen w{\"a}hrend der Planung und die Verarbeitung dieser Informationen um eine durchg{\"a}ngige Planung zu gew{\"a}hrleisten. Dies wird zum einen durch das CoBE Awarenessmodell erreicht, mit dem Ereignisse erkannt und dem Informationsverbund zur Verf{\"u}gung gestellt werden k{\"o}nnen. Zum anderen werden die Ereignisbehandlung und die darauf folgende fachgerechte Informationsverarbeitung mit Hilfe eines Multi-Agentensystems beschrieben.}, subject = {Bauplanung}, language = {de} } @inproceedings{Althoefer2000, author = {Alth{\"o}fer, Ingo}, title = {Multiple Choice Systems for Decision Support}, doi = {10.25643/bauhaus-universitaet.568}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5685}, year = {2000}, abstract = {Humans are able to think, to feel, and to sense. We are also able to compute but not very well. In contrast, computers are giants in computing. Yet, they can not do anything else besides computing. Appropriate combinations of the different gifts and strengths of human and computer may result in impressive performances. In the 3-Hirn approach one human and two computers are involved. On the computers different programs are running. The human starts the machines and inspects the solutions they propose. He compares these candidate solutions and finally decides for one of the alternatives. So, the human makes the final choice from a small number of computer proposals. In performance-oriented chess, 3-Hirn combinations consisting of an amateur player and commer-cial software have reached world class level. 3-Hirn is a Decision Support System with Multiple Choice Structure. Such Multiple Choice Systems will be exhibited and discussed.}, subject = {Entscheidung bei mehrfacher Zielsetzung}, language = {en} } @inproceedings{AmezianeLasserre2003, author = {Ameziane, Farid and Lasserre, Stephane}, title = {SYSBAT - An Application to the Building ProductionBased on Computer Supported Cooperative Work}, doi = {10.25643/bauhaus-universitaet.274}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2748}, year = {2003}, abstract = {Our proposed solution is to enable partners of a construction project to share all the technical data produced and handled during the building production process by building a system through the use of internet technology. The system links distributed databases and allows building partners to access remotely and manipulate specific information. It provides an updated building representation that is being enriched and refined all along the building production process. A recent collaboration with Nemetschek France (subsidiary company of Nemetschek AG, AEC CAD software leader) focus on a building product repository available in a web context. The aim is to help building project actors to choose a technical solution that fits its professional needs, and maintain our information system with up to date information. It starts with the possibility to build on line building product catalogs, in order to link Allplan CAD entities with building technical features. This paper presents the conceptual approaches on which our information system is built. Starting from a general organization diagram organization, we focus on the product and the description branches of construction works (including last IFC model specifications). Our aim is to add decisional support to the construction works selection process. To do so, we consider the actor's role upon the system and the pieces of information each one needs to achieve a given task.}, subject = {Bauplanung}, language = {en} } @inproceedings{AsayamaMae2004, author = {Asayama, Shuichi and Mae, Toshifumi}, title = {Fractal Truss Structure and Automatic Form Generation Using Iterated Function System}, doi = {10.25643/bauhaus-universitaet.104}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1046}, year = {2004}, abstract = {This paper describes a couple of new truss structures based on fractal geometry. One is the famous Sierpinski Gasket and another is a fractal triangle derived by means of applying a process forming leaves of a cedar tree using M. F. Barnsley's contraction mapping theory. Therefore a pair of x-y coordinates of an arbitrary nodal point on the structures are generated easily if IFS(Iterated Function System) codes and a scale of them are specified. Structural members are defined similarly. Thus data for frame analysis can be generated automatically, which is significant if the objective structure has complex configuration. Next analytical results under vertical and wind loadings in Japanese Building Code are shown. Here members are assumed to be timber and to have cross section of 15cm×15cm. Finally authors conclude that geometrically new truss structures were developed and automatic data generation for frame analysis was attained using IFS. Analytical results show they contribute to saving material when compared it with King-post truss.}, subject = {Konzipieren }, language = {en} } @article{AzizAnumbaMiles2004, author = {Aziz, Zeeshan and Anumba, Chimay and Miles, John}, title = {Towards a Semantic Grid Computing Platform for Disaster Management in Built Environment}, doi = {10.25643/bauhaus-universitaet.208}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2084}, year = {2004}, abstract = {Current disaster management procedures rely primarily on heuristics which result in their strategies being very cautious and sub-optimum in terms of saving life, minimising damage and returning the building to its normal function. Also effective disaster management demands decentralized, dynamic, flexible, short term and across domain resource sharing, which is not well supported by existing distributing computing infrastructres. The paper proposes a conceptual framework for emergency management in the built environment, using Semantic Grid as an integrating platform for different technologies. The framework supports a distributed network of specialists in built environment, including structural engineers, building technologists, decision analysts etc. It brings together the necessary technology threads, including the Semantic Web (to provide a framework for shared definitions of terms, resources and relationships), Web Services (to provide dynamic discovery and integration) and Grid Computing (for enhanced computational power, high speed access, collaboration and security control) to support rapid formation of virtual teams for disaster management. The proposed framework also make an extensive use of modelling and simulation (both numerical and using visualisations), data mining (to find resources in legacy data sets) and visualisation. It also include a variety of hardware instruments with access to real time data. Furthermore the whole framework is centred on collaborative working by the virtual team. Although focus of this paper is on disaster management, many aspects of the discussed Grid and Visualisation technologies will be useful for any other forms of collaboration. Conclusions are drawn about the possible future impact on the built environment.}, subject = {Mehragentensystem}, language = {en} } @inproceedings{BaitschHartmann2004, author = {Baitsch, Matthias and Hartmann, Dietrich}, title = {Object Oriented Finite Element Analysis for Structural Optimization using p-Elements}, doi = {10.25643/bauhaus-universitaet.108}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1089}, year = {2004}, abstract = {The optimization of continuous structures requires careful attention to discretization errors. Compared to ordinary low order formulation (h-elements) in conjunction with an adaptive mesh refinement in each optimization step, the use of high order finite elements (so called p-elements) has several advantages. However, compared to the h-method a higher order finite element analysis program poses higher demands from a software engineering point of view. In this article the basics of an object oriented higher order finite element system especially tailored to the use in structural optimization is presented. Besides the design of the system, aspects related to the employed implementation language Java are discussed.}, subject = {Konzipieren }, language = {en} } @article{BakurovaPerepelitsaZin'kovskaya1997, author = {Bakurova, A. V. and Perepelitsa, V. A. and Zin'kovskaya, J. S.}, title = {Research of Stability of Vector Problem of spanning Tree with topological Criteria}, doi = {10.25643/bauhaus-universitaet.515}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5159}, year = {1997}, abstract = {A multicriterial statement of the above mentioned problem is presented. It differes from the classical statement of Spanning Tree problem. The quality of solution is estimated by vector objective function which contains weight criteria as well as topological criteria (degree and diameter of tree). Many real processes are not determined yet. And that is why the investigation of the stability is very important. Many errors are connected with calculations. The stability analysis of vector combinatorial problems allows to discover the value of changes in the initial data for which the optimal solution is not changed. Furthermore, the investigation of the stability allows to construct the class of the problems on base of the one problem by means of the parameter variations. Analysis of the problems with belong to this class allows to obtaine axact and adecuate discription of model}, subject = {Spannender Baum}, language = {en} } @inproceedings{Bannwart1997, author = {Bannwart, E.}, title = {"CyberCity" - die Stadt im Kopf}, doi = {10.25643/bauhaus-universitaet.424}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4247}, year = {1997}, abstract = {>CyberCity< ist ein Konzept, das durch ein virtuelles Abbild der r{\"a}umlichen Realit{\"a}t einer Stadt (Berlin) eine uns bekannte Wahrnehmungsumgebung als Orientierungs- und Navigationserleichterung bereitstellt, um {\"u}ber diesen virtuellen Browser m{\"o}glichst schnell und anschaulich an eine gew{\"u}nschte Information zu kommen. Dieses Umgebungsmodell ist auch als Simulationsmodell f{\"u}r die Visualisierung stadtr{\"a}umlicher Beurteilungen neuer Projekte, verkehrstechnischer Massnahmen und {\"o}kologischer Belastungen geeignet. Insbesondere ist es als Orientierungsumgebung f{\"u}r die Telepr{\"a}senz {\"u}ber die Kommunikationsnetze gedacht, die {\"u}ber die virtuellen Repr{\"a}sentanten (Avatare) eine besondere gesellschaftliche Brisanz erh{\"a}lt.}, subject = {Stadtplanung}, language = {de} } @inproceedings{BaranskiBoron2003, author = {Baranski, Jacek and Boron, Jacek}, title = {Computer Modeling of the Joints for WGP Construction Systems}, doi = {10.25643/bauhaus-universitaet.293}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2935}, year = {2003}, abstract = {Poland is not situated in any seismic region of the earth, however there are still areas were underground mining is being conducted. In these areas, so-called 'paraseismic tremors', are very frequent phenomena. In the situation when a building examination is realized in order to define its safety, it is necessary to make a complete analysis, in which an influence of tremors should be included. To decide if a building is able to carry out any dynamic loads or not, it is necessary to compute its dynamic characteristics, i.e. natural frequencies. It is not possible using any standard techniques. After diagnosis a building in situ by an expert, computer techniques together with specialized software for dynamic, static, and strength analyses become a suitable tool. In this paper a special attention was paid to a typical twelve-store WGP (Wroclaw Great Plate) prefabricated building, concerning special type of joints. During dynamic actions these joints have a decisive influence on building's behavior. Paraseismic tremors are especially dangerous for these buildings and can be the reason of pre-failure states. It can be difficult and very expensive to prepare laboratory investigations of the part of a building or of a separate joint; therefore the computer modeling suitable to investigate behavior of such elements and whole buildings under different kinds of loads was used.}, subject = {Geb{\"a}ude}, language = {en} } @inproceedings{Becker2003, author = {Becker, Rainer}, title = {Vernetzte Embedded Systems und Visualisierung mit Java}, doi = {10.25643/bauhaus-universitaet.275}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2755}, year = {2003}, abstract = {In modernen Geb{\"a}uden nimmt die Komplexit{\"a}t der Heizungstechnik st{\"a}ndig zu. Damit wird es auch immer schwieriger, ein {\"o}kologisch und {\"o}konomisch vern{\"u}nftiges Zusammenspiel der Komponenten zu gew{\"a}hrleisten. Die Vernetzung der verschiedenen Komponenten eines Heizsystems mittels Netzwerktechnik aus der EDV soll helfen, die Energieeffizienz zu erh{\"o}hen. Embedded Systems und Mikrocontroller fungieren als Regler f{\"u}r die Teilsysteme. Durch Kommunikation untereinander sollen sie ihr Regelverhalten aneinander anpassen. Eine Internetanbindung erm{\"o}glicht die Nutzung weiterer Informationen f{\"u}r die Betriebsf{\"u}hrung. Außerdem kann der Internetanschluss f{\"u}r die Fernwartung der Anlage genutzt werden. Mit kleinen, im Webbrowser eines Rechners ausgef{\"u}hrten Java-Programmen, sogenannten Applets, k{\"o}nnen die Betriebszust{\"a}nde von Heizsystemen in Echtzeit visualisiert werden. Durch das Aufzeichnen von Betriebsdaten wird deren Analyse erm{\"o}glicht.}, subject = {Heizung}, language = {de} } @phdthesis{Beer2005, author = {Beer, Daniel G.}, title = {Systementwurf f{\"u}r verteilte Applikationen und Modelle im Bauplanungsprozess}, doi = {10.25643/bauhaus-universitaet.750}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20060418-7892}, school = {Bauhaus-Universit{\"a}t Weimar}, year = {2005}, abstract = {Der Planungsprozess im Konstruktiven Ingenieurbau ist gekennzeichnet durch drei sich zyklisch wiederholende Phasen: die Phase der Aufgabenverteilung, die Phase der parallelen Bearbeitung mit entsprechenden Abstimmungen und die Phase der Zusammenf{\"u}hrung der Ergebnisse. Die verf{\"u}gbare Planungssoftware unterst{\"u}tzt {\"u}berwiegend nur die Bearbeitung in der zweiten Phase und den Austausch der Datenbest{\"a}nde durch Dokumente. Gegenstand der Arbeit ist die Entwicklung einer Systemarchitektur, die in ihrem Grundsatz alle Phasen der verteilten Bearbeitung und unterschiedliche Arten der Kooperation (asynchron, parallel, wechselseitig) ber{\"u}cksichtigt und bestehende Anwendungen integriert. Das gemeinsame Arbeitsmaterial der Beteiligten wird nicht als Dokumentmenge, sondern als Menge von Objekt- und Elementversionen und deren Beziehungen abstrahiert. Elemente erweitern Objekte um applikationsunabh{\"a}ngige Eigenschaften (Features). F{\"u}r die Bearbeitung einer Aufgabe werden Teilmengen auf Basis der Features gebildet, f{\"u}r deren Elemente neue Versionen abgeleitet und in einen privaten Arbeitsbereich geladen werden. Die Bearbeitung wird auf Operationen zur{\"u}ckgef{\"u}hrt, mit denen das gemeinsame Arbeitsmaterial konsistent zu halten ist. Die Systemarchitektur wird formal mit Mitteln der Mathematik beschrieben, verf{\"u}gbare Technologie beschrieben und deren Einsatz in einem Umsetzungskonzept dargestellt. Das Umsetzungskonzept wird pilothaft implementiert. Dies erfolgt in der Umgebung des Internet in der Sprache Java unter Verwendung eines Versionsverwaltungswerkzeuges und relationalen Datenbanken.}, subject = {Planungsprozess}, language = {de} } @inproceedings{BeerFirmenich2003, author = {Beer, Daniel G. and Firmenich, Berthold}, title = {Freigabebest{\"a}nde von strukturierten Objektversionsmengen in Bauprojekten}, doi = {10.25643/bauhaus-universitaet.8}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-80}, year = {2003}, abstract = {Die verteilte Bearbeitung gemeinsamer Produktmodelle ist im Bauwesen Gegenstand der aktuellen Forschung. Der vorgestellte L{\"o}sungsansatz bewegt sich in einem Spannungsfeld: Zum einen sollen die zu bearbeitenden Teilmengen des Produktmodells sehr flexibel durch die Planer zu bilden sein, zum anderen m{\"u}ssen Revisions- und Freigabest{\"a}nde dauerhaft und unver{\"a}nderlich definiert werden. In einer versionierten Umgebung mit vielen Abh{\"a}ngigkeiten sind diese Anforderungen schwierig zu erf{\"u}llen. Der vorgestellte L{\"o}sungsansatz zeigt die Bildung von Revisions- und Freigabest{\"a}nden, ohne die flexible verteilte Bearbeitung einzuschr{\"a}nken. Die Freigabest{\"a}nde m{\"u}ssen bestimmte Eigenschaften erf{\"u}llen: Es darf beispielsweise nur eine Version eines Objekts enthalten sein und es m{\"u}ssen die Bindungen zu anderen Objektversionen in einer konsistenten Weise ber{\"u}cksichtigt werden. Es wird eine mathematische Beschreibung gew{\"a}hlt, die auf der Mengenlehre und der Graphentheorie basiert.}, subject = {Bauvorhaben}, language = {de} } @article{BeerFirmenichRichter2004, author = {Beer, Daniel G. and Firmenich, Berthold and Richter, Torsten}, title = {A Concept for CAD Systems with Persistent Versioned Data Models}, doi = {10.25643/bauhaus-universitaet.204}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2046}, year = {2004}, abstract = {The synchronous distributed processing of common source code in the software development process is supported by well proven methods. The planning process has similarities with the software development process. However, there are no consistent and similarly successful methods for applications in construction projects. A new approach is proposed in this contribution.}, subject = {Produktmodell}, language = {en} } @inproceedings{BerbigMenzelEisenblaetter2003, author = {Berbig, Torsten and Menzel, Karsten and Eisenbl{\"a}tter, Karin}, title = {"Mobile Computing" - Anforderungen \& Einf{\"u}hrungsstratgie aus Sicht der Baupraxis}, doi = {10.25643/bauhaus-universitaet.294}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2948}, year = {2003}, abstract = {Die Sicherung der Wettbewerbsf{\"a}higkeit im Bereich des Bauwesens, insbesondere kleinerer und mittelst{\"a}ndischer Betriebe erfordert ein aktives Handeln als Antwort auf die sich {\"a}ndernde Wettbewerbssituation. Einen wesentlichen Wettbewerbsvorteil k{\"o}nnen kleine unternehmerische Einheiten durch h{\"o}here Flexibilit{\"a}t, schnelle Reaktion auf Kundenw{\"u}nsche oder aktuelle Situationen auf der Baustelle und Marktn{\"a}he erreichen. Dazu ist es n{\"o}tig, die Informations- und Kommunikationsstr{\"o}me durch Einsatz standardisierter und kosteng{\"u}nstiger Hard- und Software wie z.B. Handhelds zu unterst{\"u}tzen und insbesondere die existierenden Hindernisse im Informationsfluss zwischen Baustelle und B{\"u}ro zu beseitigen. Am Beispiel der Projekte >IuK - SystemBau< und >eSharing< wird eine Einf{\"u}hrungsstrategie f{\"u}r >Mobile Computing< in kleinen unternehmerischen Einheiten des Bauwesens (KMU) basierend auf einer umfangreichen Anforderungsanalyse vorgestellt. Folgende Aspekte sollen beschrieben werden: durchg{\"a}ngiger Einsatz der Technik unter Beachtung der verschiedenen Qualifikationsniveaus, Einf{\"u}hrungsunterst{\"u}tzung durch Schulungen, Prozessanalyse und m{\"o}gliche Integration in bestehende Software-Umgebungen sowie Feldtests.}, subject = {Bauablauf / Ablaufplanung}, language = {de} } @inproceedings{BergerGraeffWeinberg1997, author = {Berger, Hans and Graeff-Weinberg, K.}, title = {FEM-Detailuntersuchungen an Tragwerken unter Einsatz von pNh-{\"U}bergangselementen}, doi = {10.25643/bauhaus-universitaet.426}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4267}, year = {1997}, abstract = {Detailuntersuchungen an Tragwerken f{\"u}hren bei FE-Berechnungen immer wieder auf das Problem einer geeigneten Netzgestaltung. W{\"a}hrend in weiten Bereichen ein grobes Netz ausreicht, muß an kritischen Stellen ein sehr feines Netz gew{\"a}hlt werden, um gerade dort hinreichend genaue Ergebnisse zu erhalten. Bei der Realisierung lokaler Netzverdichtungen stellt die Gestaltung des {\"U}bergangs vom groben zum feinen Netz das Hauptproblem dar. Im Beitrag wird hierzu eine Familie von FE-{\"U}bergangselementen vorgestellt, mit denen sich eine voll-kompatible Kopplung von wenigen großen Elementen mit vielen kleinen Elementen bereits {\"u}ber nur eine Stufe erzielen l{\"a}ßt. Diese neu entwickelten sogenannten pNh-Elemente erm{\"o}glichen an einer oder mehreren Seiten den Anschluß von N kleineren Elementen (Elementseiten f{\"u}r h-Verfeinerung). Das wird durch N st{\"u}ckweise definierte Ansatzfunktionen an den entsprechenden Seiten erreicht, wobei die Teilung nicht {\"a}quidistant sein braucht. Dar{\"u}ber hinaus ist es m{\"o}glich, Elemente unterschiedlichen Polynomgrades p an den Standardseiten und den Verfeinerungsseiten anzuschließen. Der praktische Einsatz der {\"U}bergangselemente setzt geeignete automatische oder halbautomatische Netzgeneratoren voraus, die diese Elemente einbeziehen. Im Rahmen einer substrukturorientierten Modellierung l{\"a}ßt sich dies besonders g{\"u}nstig realisieren. Im Beitrag wird gezeigt, wie durch Zerlegung des Gesamtmodells in Bereiche mit grobem Netz, mit {\"U}bergangsnetz und mit feinem Netz, eine effektive Generierung der Netzverdichtungen zu erreichen ist. An einem praktischen Beispiel aus dem Bauingenieurwesen werden die Vorteile des vorgestellten {\"U}bergangselementkonzeptes umfassend demonstriert.}, subject = {Tragwerk}, language = {de} } @inproceedings{BerkhahnKinkeldeySchleinkofer2004, author = {Berkhahn, Volker and Kinkeldey, Christoph and Schleinkofer, Matthias}, title = {Re-Engineering Based on Construction Drawings - From Ground Floor Plan to Product Model}, doi = {10.25643/bauhaus-universitaet.183}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1832}, year = {2004}, abstract = {For the management or reorganisation of existing buildings, data concerning dimensions and construction are necessary. Often these data are given exclusively by paper-based drawings and no digital data such as a computer based product model or even a CAD-model are available. In order to perform mass calculation, damage mapping or a recalculation of the structure these drawings of the building under consideration have to be analysed manually by the engineer. This is a very time-consuming job. In order to close this gap between drawings of an existing building and a digital product model an approach is presented in this paper to digitise a drawing, to build up geometric and topologic models and to recognise construction parts of the building. Finally all recognised parts are transformed into a three-dimensional geometric model which provides all necessary geometric information for the product model. During this import process the semantics of a ground floor plan has to be converted into a 3D-model.}, subject = {Architektur}, language = {en} } @article{BerkowskiBoron1997, author = {Berkowski, P. and Boron, Jacek}, title = {An Algorithm of compromise structural Optimisation of Bar Structures}, doi = {10.25643/bauhaus-universitaet.526}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5264}, year = {1997}, abstract = {Authors' own research in applied unicriterial and multicriterial optimisation of bar structures, and also an analysis of accessible bibliography on structural synthesis allows to present herein an attempt to define a general algorithm for proceeding in formulation of a structural optimisation problem. A practical aspect of such an algorithm consists, in author's opinion, in enabling a designer a correct creation of a mathematical model of synthesis problems, independently of known mathematical methods employed to looking for an unconditional extremum of function of several variables. A proposed algorithm is not a ready-for-use tool for solving all the optimisation problems, but it constitutes an easy-to-expand theoretical basis. This basis should allow a designer to create a proper set of compromises on the way to construct a mathematical model of a specific optimisation problem. The algorithm, presented in the paper, is constructed as a sequence of the one-after-another problem questions, on which the designer answers: yes or no, and a set of selections from the knowledge base consisting of the elements of an optimisation problem components. The order of making questions adopted by the authors in the algorithm is subjective, however it is supported by their experience, both in applied optimisation and in designing of structures like trusses or frames.}, subject = {Stabwerk}, language = {en} } @inproceedings{Bernstein2003, author = {Bernstein, Swanhild}, title = {Lippmann-Schwinger's integral equation for quaternionic Dirac operators : Integral Representations for Solutions of Quaternionic Dirac-type equations}, doi = {10.25643/bauhaus-universitaet.277}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2772}, year = {2003}, abstract = {Maxwell's equations can be rewritten in terms of a Dirac operator D+a. The advantage is that in this setting Maxwell's equations are treated as a system of first order differential equations. To ensure the uniqueness of a non-homogeneous differential equation in the whole space additional conditions are needed.}, subject = {Quaternion}, language = {en} } @inproceedings{BernsteinRichter2003, author = {Bernstein, Swanhild and Richter, Matthias}, title = {The Use of Genetic Algorithms in Finite Element Model Identification}, doi = {10.25643/bauhaus-universitaet.276}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2769}, year = {2003}, abstract = {A realistic and reliable model is an important precondition for the simulation of revitalization tasks and the estimation of system properties of existing buildings. Thereby, the main focus lies on the parameter identification, the optimization strategies and the preparation of experiments. As usual structures are modeled by the finite element method. This as well as other techniques are based on idealizations and empiric material properties. Within one theory the parameters of the model should be approximated by gradually performed experiments and their analysis. This approximation method is performed by solving an optimization problem, which is usually non-convex, of high dimension and possesses a non-differentiable objective function. Therefore we use an optimization procedure based on genetic algorithms which was implemented by using the program package SLang...}, subject = {Finite-Elemente-Methode}, language = {en} } @inproceedings{Beucke1997, author = {Beucke, Karl}, title = {Entwicklung der Bauinformatik in Deutschland}, doi = {10.25643/bauhaus-universitaet.423}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4233}, year = {1997}, abstract = {Die Informatik im Bauwesen oder kurz Bauinformatik hat sich in den vergangenen Jahren in Deutschland kontinuierlich entwickelt und sie hat einen festen Platz in den Fakult{\"a}ten im Bauingenieurwesen an den deutschen Universit{\"a}ten erhalten. Diese Entwicklung war anf{\"a}nglich sehr stark fixiert auf die Berechnungen des physikalischen Verhaltens von Bauwerken. In den letzten Jahren kamen weitere Gebiete hinzu. Hier ist vor allem die Zeichnungserstellung (CAD) hervorzuheben. Diese Entwicklungen haben einen großen Reifegrad erlangt und sie haben einen festen Platz in Lehre und Forschung in der Bauinformatik. Die Rolle der Bauinformatik allgemein hat in den letzten Jahren eine st{\"u}rmische Entwicklung genommen. Die Breite der Anwendungen hat st{\"a}ndig zugenommen und die Forderung nach einer durchg{\"a}ngigen Nutzbarkeit aller Informationen, die in diesem Zusammenhang bearbeitet werden, wird immer st{\"a}rker gestellt. Besonders zwei Problemstellungen stehen im Mittelpunkt vieler Entwicklungen in der Bauindustrie und in den entsprechenden Softwareh{\"a}usern. Dies sind die Entwicklung und Nutzung technischer Modelle zur Unterst{\"u}tzung des Bauprozesses und die Unterst{\"u}tzung betriebswirtschaftlicher Anforderungen in der Bauindustrie. Vor allem die zweite Anforderung war bisher kaum Gegenstand der Bauinformatik. Aktuelle Bestrebungen vor allem aus der Praxis wirken darauf hin, diesen Zustand zu {\"a}ndern. Die Fakult{\"a}t Bauingenieurwesen an der Bauhaus-Universit{\"a}t beginnt diesen Anforderungen dadurch Rechnung zu tragen, daß kontinuierlich die notwendigen Voraussetzungen geschaffen werden, um diese Thematik in Lehre und Forschung kompetent aufnehmen zu k{\"o}nnen. Externe Referenten, die an der Spitze entsprechender Entwicklungen sind, werden in die Lehre mit eingebunden. Dies soll eine kontinuierliche Weiterentwicklung einleiten, die helfen soll, eine zeitgem{\"a}ße Ausbildung der zuk{\"u}nftigen Bauingenieure sicherzustellen.}, subject = {Bauwesen}, language = {de} } @inproceedings{BiehounekGrolik2000, author = {Biehounek, Josef and Grolik, Helmut}, title = {Zur voll-probabilistischen Verallgemeinerung des Kraftgr{\"o}ßenverfahrens}, doi = {10.25643/bauhaus-universitaet.572}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5728}, year = {2000}, abstract = {Die Versagenswahrscheinlichkeit nach einem Grenzzustand wird gew{\"o}hnlich mit dem Integral I der Basisvariablen-Verteilungsdichte {\"u}ber den Versagensbereich bestimmt. Dabei ist eine geschlossene L{\"o}sung nur im Spezialfall normalverteilter Basisvariablen bei Linearit{\"a}t der Grenzzustandsgleichung m{\"o}glich. In anderen F{\"a}llen sind verschiedene N{\"a}herungsverfahren gebr{\"a}uchlich, die auf den Momenten der Basisvariablen und geeignet gew{\"a}hlten Indizes als Sicherheitskenngr{\"o}ßen beruhen. Eine gr{\"o}ßere Genauigkeit bieten die Zuverl{\"a}ssigkeitstheorien erster bzw. zweiter Ordnung, die ebenfalls von I ausgehen. Im Beitrag wird ein neuartiges Verfahren vorgestellt, dessen Ausgangspunkt nicht I, sondern das Kraftgr{\"o}ßenverfahren als einem Standardalgorithmus des konstruktiven Ingenieurbaus ist. Die Einbeziehung der maßgebenden Zufallsgr{\"o}ßen in die Matrix der Vorzahlen und die Belastungszahlen f{\"u}hrt zur Verallgemeinerung des Systems der Elastizit{\"a}tsgleichungen zum zuf{\"a}lligen System der Elastizit{\"a}tsgleichungen. Dessen L{\"o}sung, die durch den {\"U}bergang zu einem deterministischen Ersatzsystem gewonnen wird, liefert die statisch Unbestimmten als Funktionen der im System wirkenden Zufallsgr{\"o}ßen (z.B. E-Modul der St{\"a}be und Belastung). Da dieser Zusammenhang analytisch vorliegt, kann die Wirkung einzelner Zufallseinfl{\"u}sse auf die statisch Unbestimmten und die daraus folgenden sicherheitsrelevanten Zustandsgr{\"o}ßen beurteilt werden. Die Dichtefunktion der Grenzzustandsgleichung kann berechnet oder durch Simulation ermittelt werden. Daraus folgt . Nicht normalverteilte Zufallsgr{\"o}ßen werden durch Entwicklung in orthogonale Polynome Gaußscher Zufallsgr{\"o}ßen ber{\"u}cksichtigt.}, subject = {Kraftmethode}, language = {de} } @inproceedings{BiehounekGrolikHerz2003, author = {Biehounek, Josef and Grolik, Helmut and Herz, Susanne}, title = {Zur Anwendung von Chaos-Entwicklungen in der Tragwerksstatik}, doi = {10.25643/bauhaus-universitaet.278}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2784}, year = {2003}, abstract = {Seit mehr als f{\"u}nfzig Jahren werden zur Untersuchung der Tragwerkssicherheit auch Methoden der Wahrscheinlichkeitsrechnung herangezogen. Ungeachtet der inzwischen erreichten Fortschritte und der offensichtlichen Vorz{\"u}ge, konnte dieses Vorgehen in der Praxis bis jetzt noch nicht ausreichend Fuß fassen. Im Beitrag wird das Problem der Tragwerkssicherheit mit einem neuartigen Verfahren behandelt. Im Unterschied zu den {\"u}blichen probabilistischen Methoden geht es nicht von Verteilungsfunktionen aus. Vielmehr werden die maßgebenden Zufallsgr{\"o}ßen in den Mittelpunkt gestellt und direkt in die Rechenvorschrift eingef{\"u}hrt. Als mathematisches Hilfsmittel dienen die WIENERschen Chaos-Polynome. Sie stellen im Raum der Zufallsgr{\"o}ßen mit beschr{\"a}nkter Varianz eine Basis dar, mit der sich eine beliebige Zufallsgr{\"o}ße nach orthogonalen Polynomen GAUSSscher Zufallsgr{\"o}ßen entwickeln l{\"a}ßt. So entsteht ein effektiver Formalismus, der sich eng an die herk{\"o}mmliche Deformationsmethode anlehnt und als deren probabilistische Verallgemeinerung angesprochen werden darf. Die Methode liefert die Grenzzustandsbedingung als Funktion der auf das Tragwerk wirkenden Zufallsgr{\"o}ßen. Die Versagenswahrscheinlichkeit kann daher durch Monte-Carlo-Simulation bestimmt werden. Die mit der Auswertung des Wahrscheinlichkeitsintegrals der First Order Reliability Method (FORM) verbundenen Schwierigkeiten werden vermieden. An einem Beispieltragwerk wird dargestellt, wie sich Ver{\"a}nderungen gewisser Konstruktionsparameter auf die Versagenswahrscheinlichkeit auswirken.}, subject = {Baustatik}, language = {de} } @inproceedings{BilekHartmann2003, author = {Bilek, Jochen and Hartmann, Dietrich}, title = {Agentenbasiertes Kooperationsmodell zur Unterst{\"u}tzung vernetzter Planungsprozesse in der Tragwerksplanung}, doi = {10.25643/bauhaus-universitaet.279}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2791}, year = {2003}, abstract = {Die heutige Situation in der Tragwerksplanung ist durch das kooperative Zusammenwirken einer gr{\"o}ßeren Anzahl von Fachleuten verschiedener Disziplinen (Architektur, Tragwerksplanung, etc.) in zeitlich befristeten Projektgemeinschaften gekennzeichnet. Bei der Abstimmung der hierdurch bedingten komplexen, dynamischen und vernetzten Planungsprozesse kommt es dabei h{\"a}ufig zu Planungsm{\"a}ngeln und Qualit{\"a}tseinbußen. Dieser Artikel zeigt auf, wie mit Hilfe der Agententechnologie L{\"o}sungsans{\"a}tze zur Verbesserung der Planungssituation erreicht werden k{\"o}nnen. Hierzu wird ein Agentenmodell f{\"u}r die vernetzt-kooperative Tragwerksplanung vorgestellt und anhand der Planung einer Fußg{\"a}ngerbogenbr{\"u}cke anschaulich demonstriert. Das Agentenmodell erfasst (1) die beteiligten Fachplaner und Organisationen, (2) die tragwerksspezifischen Planungsprozesse, (3) die zugeh{\"o}rigen (Teil-)Produktmodelle und (4) die genutzte (Ingenieur-)Software. Hieraus leiten sich die drei Teilmodelle (1) agentenbasiertes Kooperationsmodell, (2) agentenbasierte Produktmodellintegration und (3) Modell zur agentenbasierten Software-Integration ab. Der Fokus des Artikels liegt auf der Darstellung des agentenbasierten Kooperationsmodells.}, subject = {Tragwerk}, language = {de} } @inproceedings{Biltchouk2003, author = {Biltchouk, Irina}, title = {Entwicklung einer Datenbasis f{\"u}r Anwendungen im Bauwesen}, doi = {10.25643/bauhaus-universitaet.312}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-3123}, year = {2003}, abstract = {Die Aufgaben des Bauwesens erfordern den direkten Zugriff auf Objekte einer Datenbasis, die in dem Arbeitsspeicher einer Sitzung und in mehreren Bin{\"a}rdateien verteilt sind. In den Methoden einer Anwendung soll jedes Objekt unabh{\"a}ngig vom Ort seiner Speicherung mit seinem Namen als persistentem Identifikator direkt ansprechbar sein. Bei Bedarf sollen Objekte automatisch aus Dateien nachgeladen werden. Der Anwender soll bestimmen k{\"o}nnen, in welcher Datei ein bestimmtes Objekt gespeichert wird. Die Zugriffszeit auf ein Objekt soll im Mittel mit der Zugriffszeit auf ein Objekt in einer Java-Methode vergleichbar sein. Ein Konzept einer generalisierten Datenbasis wird vorgestellt. Seine Leistungsf{\"a}higkeit wird mit der vorhandenen Software f{\"u}r die Aufbewahrung und Verwaltung von Daten im Bauwesen verglichen. Es erweist sich als zweckm{\"a}ßig, bereits im Entwurf einer Anwendung streng zwischen persistenten und transienten Objekten zu unterscheiden. Alle persistenten Objekte der Anwendung werden benannt. Unbenannte persistente Objekte der Java Plattform, beispielsweise Kollektionen und graphische Objekte, sind ebenfalls mit einem Griff (einem von der Datenbasis zugeteilten Namen) speicherbar. Der Zugriff auf ein Objekt ist schnell, da nur primitive Datentypen und Strings in bin{\"a}rer Form ohne R{\"u}ckgriff auf Datenbanken gespeichert werden.}, subject = {Bauplanung}, language = {de} } @inproceedings{BiltchoukPahl2004, author = {Biltchouk, Irina and Pahl, Peter Jan}, title = {Interaction of Data Bases and Graphical Interfaces in Civil Engineering}, doi = {10.25643/bauhaus-universitaet.163}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1636}, year = {2004}, abstract = {Applications for civil engineering tasks usually contain graphical user interfaces for the engineering processes. Persistent objects of the applications are stored to data bases. The influence of the interaction between a graphical user interface and a data base for the development of an civil engineering application is investigated in this paper. A graphic application for the linear elastic analysis of plane frames, which was previously developed with standard tools of the Java platform, is compared to a redesigned implementation using a generalized data base for persistent objects. The investigation leads to the following results : - A strict distinction between persistent and transient objects influences the class structure of an application, in particular the class structure of a graphical user interface. - The structure of an application depends on the logic for updating of references to persistent and transient graphical objects after an application is read from a file. - The complexity of the reference management can usually be handled better by just in time referencing associated with String - identifiers rather than by automated referencing associated with Name - identifiers.}, subject = {Baubetrieb}, language = {en} } @inproceedings{Bittrich2000, author = {Bittrich, Daniel}, title = {Verbunddokumente als Nutzeroberfl{\"a}che von Software f{\"u}r die Tragwerksplanung}, doi = {10.25643/bauhaus-universitaet.573}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5739}, year = {2000}, abstract = {Der Schwerpunkt von Forschung und Entwicklung auf dem Gebiet der Tragwerksplanungs-Software lag in den letzten Jahren auf der Erweiterung des funktionalen Umfangs. In der Folge ist es notwendig, den gestiegenen Funktionsumfang einem m{\"o}glichst breiten Anwenderkreis durch ingenieurgem{\"a}ß gestaltete Arbeitsumgebungen zug{\"a}nglich zu machen, so dass ein m{\"o}glichst effizientes und fehlerarmes Arbeiten erm{\"o}glicht wird. Aus der Sicht der Tragwerksplaner muss eine ingenieurgem{\"a}ß gestaltete Software eine dem spezifischen Arbeitsablauf angepasste Nutzer-Software-Interaktion aufweisen. Dabei sind die ben{\"o}tigten Funktionalit{\"a}ten in ein einheitliches System zu integrieren und eine Anpassbarkeit durch den Anwender sicherzustellen. Die Ber{\"u}cksichtigung dieser Anforderungen mit herk{\"o}mmlichen Mitteln w{\"u}rde einen unverh{\"a}ltnism{\"a}ßig hohen Entwicklungsaufwand erfordern. Infolgedessen muss aus der Sicht der Software-Entwickler eine moderne Software-Architektur f{\"u}r die Tragwerksplanung eine Erh{\"o}hung des Wiederverwendungsgrades und eine unabh{\"a}ngige Erweiterbarkeit als zus{\"a}tzliche Anforderungen erf{\"u}llen. In diesem Beitrag wird ein auf Verbunddokumenten basierendes Konzept vorgestellt, mit dem eine Zusammenf{\"u}hrung von Standard-Software und fachspezifischen Software-Komponenten zu einer ingenieurgem{\"a}ßen Arbeitsumgebung erm{\"o}glicht wird. Damit kann die Analyse und die Dokumentation eines Tragelementes einschließlich der zugeh{\"o}rigen Datenhaltung innerhalb eines Verbunddokumentes erfolgen. Gleichzeitig kann der software-technische Wiederverwendungsgrad durch die Definition eines Component Frameworks als unabh{\"a}ngig erweiterbare Software-Architektur und durch den Einsatz von Software-Komponenten mit eigener Nutzeroberfl{\"a}che {\"u}ber das bisher erreichte Niveau hinaus gesteigert werden. Die Umsetzbarkeit des Konzeptes wird durch eine Pilotimplementierung demonstriert.}, subject = {Tragwerk}, language = {de} } @phdthesis{Bittrich2001, author = {Bittrich, Daniel}, title = {Verbunddokumente als Nutzeroberfl{\"a}che von Software f{\"u}r die Tragwerksplanung}, doi = {10.25643/bauhaus-universitaet.20}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20040212-229}, school = {Bauhaus-Universit{\"a}t Weimar}, year = {2001}, abstract = {Das Ziel der Arbeit besteht in der Entwicklung von Konzepten zur effizienten Implementierung von ingenieurgem{\"a}ßer Tragwerksplanungs-Software. Der vorgeschlagene L{\"o}sungsansatz basiert auf einer optimalen Anpassung der Nutzeroberfl{\"a}che an den spezifischen Arbeitsablauf, der Erh{\"o}hung des Wiederverwendungsgrades sowie der M{\"o}glichkeit der unabh{\"a}ngigen Erweiterbarkeit von Software-Systemen. Verbunddokumente werden als Nutzeroberfl{\"a}che und Software-Architektur benutzt, um eine Zusammenf{\"u}hrung von Standard-Software und fachspezifischen Software-Komponenten zu ingenieurgem{\"a}ßer Tragwerksplanungs-Software zu erm{\"o}glichen. Die Umsetzbarkeit des Konzeptes wird durch eine Pilotimplementierung verifiziert.}, subject = {Tragwerk}, language = {de} } @inproceedings{BonevHristov2000, author = {Bonev, Z. and Hristov, H.}, title = {BEHAVIOR FACTOR EVALUATION BASED ON SDOF SYSTEM PRESENTATION AND ENERGY APPROACH}, doi = {10.25643/bauhaus-universitaet.570}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5702}, year = {2000}, abstract = {Rectangular steel frames are considered and subjected to strong ground motion. Their behavior factor is numerically evaluated using nonlinear time history analysis and different ground acceleration records. The behavior factor is determined assuming severe collapse mechanism occurs throughout the time history. The system of equations is transformed into single equation end then the energy balance concept is applied. The expression for the behavior factor is derived and its application to four story two bays steel frame is illustrated and the corresponding results are discussed.}, subject = {Rahmentragwerk}, language = {en} } @inproceedings{BothKohlerGessmann2004, author = {Both, Petra von and Kohler, Niklaus and Gessmann, Robin}, title = {A virtual life cycle structured platform for building applications}, doi = {10.25643/bauhaus-universitaet.121}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1219}, year = {2004}, abstract = {The development of a life cycle structured cooperation platform is described, which is based on an integrated process and goal-oriented project model. Furthermore the structure of a life cycle oriented object structure model and its implementation in the platform are documented. The complete conceptual model is described, which represents the basis of a lifecycle -oriented structuring of the planning object and supports the thematic classification of the object and project management data.}, subject = {Bauwerk}, language = {en} } @inproceedings{BoukampAkinci2004, author = {Boukamp, Frank and Akinci, Burcu}, title = {Towards Automated Defect Detection: Object-oriented Modeling of Construction Specifications}, doi = {10.25643/bauhaus-universitaet.131}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1315}, year = {2004}, abstract = {This paper describes an ongoing research on the representation and reasoning about construction specifications, which is part of a bigger research project that aims at developing a formalism for automating the identification of deviations and defects on construction sites. We specifically describe the requirements on product and process models and an approach for representing and reasoning about construction specifications to enable automated detection and assessment of construction deviations and defects. This research builds on the previous research on modeling design specifications and extends and elaborates concept of contexts developed in that domain. The paper provides an overview of how the construction specifications are being modele d in this research and points out future steps that need to be accomplished to develop the envisioned automated deviation and defect detection system.}, subject = {Bauwerk}, language = {en} } @inproceedings{BoykoKoepplerKirichuk2000, author = {Boyko, Igor P. and K{\"o}ppler, H. and Kirichuk, A.}, title = {INTERACTION OF SPATIAL THIN-WALLED STRUCTURES WITH FLUID-SATURATED SOIL}, doi = {10.25643/bauhaus-universitaet.574}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5748}, year = {2000}, abstract = {Thin-walled spatial structures are broadly used in the modern technician and building. In fuel industry for long-term keeping of oil and gas are used reservoirs of various capacity, which on technological reasons can be shipped under the soil. Shells of reservoirs combine in itself high toughness and low specific consumption of materials. At the same time, being under the soil, they feel steady-state and dynamic loads from ambiance, which particularly in the event, when reservoir is empty, can bring about the loss of stability of its form. On the other hand contact interactions of shell and soil greatly depend on features of ambiance and its saturating of liquid. For building generalized porous springy ambiance models, saturated by the liquid, it is possible to use Bio equations of motion for displacement of hard and fluid phases. Elaboration of mathematical specified interaction models and theirs realization by means of modern computing software allows to study behaviour of spatial thin-walled designs on base of geometric nonlinear theory of shells}, subject = {Raumtragwerk}, language = {en} } @inproceedings{BrackxDeSchepperLagae2003, author = {Brackx, Fred and De Schepper, Hennie and Lagae, Johan}, title = {Mathematical model of the laminated frame for a dome}, doi = {10.25643/bauhaus-universitaet.280}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2803}, year = {2003}, abstract = {On the basis of the little material available (an architecture plan and some photographs) a computer model is developed for a bullet shaped dome, part of the Belgian Congo pavilion, created by the architect Henry Lacoste for the International Colonial Exhibition of 1931 in Paris. The ingenious and elegant wooden skeleton of the dome is approximated in two stages. The first approximation focusses on the curves traced on the dome by the wooden laminae, which appear to be loxodromes, cutting the meridians by a constant angle. In a second approximation the very specific joints of the laminae are taken into consideration. The resulting computer image shows an astonishing resemblance with the photographs. Finally, the shapes and dimensions of all laminae are calculated, enabling a possible reconstruction of the dome.}, subject = {Kuppel}, language = {en} } @inproceedings{BrackxDeSchepperSommen2003, author = {Brackx, Fred and De Schepper, Nele and Sommen, Frank}, title = {The Hermite Transformation in Quaternionic Analysis}, doi = {10.25643/bauhaus-universitaet.281}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2817}, year = {2003}, abstract = {The conventional way of describing an image is in terms of its canonical pixel-based representation. Other image description techniques are based on image transformations. Such an image transformation converts a canonical image representation into a representation in which specific properties of an image are described more explicitly. In most transformations, images are locally approximated within a window by a linear combination of a number of a priori selected patterns. The coefficients of such a decomposition then provide the desired image representation. The Hermite transform is an image transformation technique introduced by Martens. It uses overlapping Gaussian windows and projects images locally onto a basis of orthogonal polynomials. As the analysis filters needed for the Hermite transform are derivatives of Gaussians, Hermite analysis is in close agreement with the information analysis carried out by the human visual system. In this paper we construct a new higher dimensional Hermite transform within the framework of Quaternionic Analysis. The building blocks for this construction are the Clifford-Hermite polynomials rewritten in terms of Quaternionic analysis. Furthermore, we compare this newly introduced Hermite transform with the Quaternionic-Hermite Continuous Wavelet transform. The Continuous Wavelet transform is a signal analysis technique suitable for non-stationary, inhomogeneous signals for which Fourier analysis is inadequate. Finally the developed three dimensional filter functions of the Quaternionic-Hermite transform are tested with traditional scalar benchmark signals upon their selectivity at detecting pointwise singularities.}, subject = {Quaternion}, language = {en} } @inproceedings{BrehmMost2003, author = {Brehm, Maik and Most, Thomas}, title = {A Four-Node Plane EAS-Element for Stochastic Nonlinear Materials}, doi = {10.25643/bauhaus-universitaet.282}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2825}, year = {2003}, abstract = {Iso-parametric finite elements with linear shape functions show in general a too stiff element behavior, called locking. By the investigation of structural parts under bending loading the so-called shear locking appears, because these elements can not reproduce pure bending modes. Many studies dealt with the locking problem and a number of methods to avoid the undesirable effects have been developed. Two well known methods are the >Assumed Natural Strain< (ANS) method and the >Enhanced Assumed Strain< (EAS) method. In this study the EAS method is applied to a four-node plane element with four EAS-parameters. The paper will describe the well-known linear formulation, its extension to nonlinear materials and the modeling of material uncertainties with random fields. For nonlinear material behavior the EAS parameters can not be determined directly. Here the problem is solved by using an internal iteration at the element level, which is much more efficient and stable than the determination via a global iteration. To verify the deterministic element behavior the results of common test examples are presented for linear and nonlinear materials. The modeling of material uncertainties is done by point-discretized random fields. To show the applicability of the element for stochastic finite element calculations Latin Hypercube Sampling was applied to investigate the stochastic hardening behavior of a cantilever beam with nonlinear material. The enhanced linear element can be applied as an alternative to higher-order finite elements where more nodes are necessary. The presented element formulation can be used in a similar manner to improve stochastic linear solid elements.}, subject = {Nichtlineare Mechanik}, language = {en} } @inproceedings{BreitKuendigHaeubi2004, author = {Breit, Manfred and K{\"u}ndig, Daniel and H{\"a}ubi, Fritz}, title = {Project oriented learning environment (POLE-Europe)}, doi = {10.25643/bauhaus-universitaet.93}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-935}, year = {2004}, abstract = {The presented work focuses on collaboration- experiences gathered with complex design and engineering projects, using the learning platform POLE- Europe. Within the POLE environment student-teams from different universities, disciplines and cultural backgrounds are assigned to real-world projects with clearly defined design - tasks, usually to be accomplished within one semester while working in a virtual environment for most of the time. The concept of POLE and the information and collaboration technology is described.}, subject = {Bautechnik}, language = {en} } @inproceedings{BrennigSanio2004, author = {Brennig, Thomas and Sanio, Hans-Peter}, title = {New Methods of Computer Aided Optimization of Investment and Operating Costs for Buildings During Their Useful Life}, doi = {10.25643/bauhaus-universitaet.96}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-965}, year = {2004}, abstract = {Current software solutions for real estate planning, construction and use, do not model the complete life cycle of a building. Well-integrated software tools exist for the planning and construction phases. Data integrity exists throughout the planning and construction phases, but problems occur at the transition to the use-phase. At this interface, the complete data set of planning and execution gets lost. Another software deficiency is that current software solutions don't handle construction work and maintenance work equally. This is why a new software generation is demanded, which continuously covers the entire workflow process from the planning phase to the demolition of a building. New data concepts have to be developed, which allow bringing work items for construction together with work items for real estate use.}, subject = {Optimierung}, language = {en} } @inproceedings{BubnerFriedrich2003, author = {Bubner, Andre and Friedrich, Torsten}, title = {Klassifikation und Definition baufachlicher Verkn{\"u}pfungstypen als Basis zur Modell{\"u}berf{\"u}hrung im konstruktiven Ingenieurbau}, doi = {10.25643/bauhaus-universitaet.283}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2834}, year = {2003}, abstract = {Die Bearbeitung von Bauprojekten erfordert ein hohes Maß an Fachwissen verschiedener Disziplinen. Dabei kommt eine Vielzahl spezialisierter Fachmodelle zum Einsatz. Zur {\"U}bernahme der Daten von anderen Planern in das eigene, neu zu erstellende Fachmodell sind die verf{\"u}gbaren Inhalte aus verschiedenen Modellen vom Fachplaner entsprechend seiner Anforderungen anzupassen und um spezifische Inhalte zu erg{\"a}nzen. Dabei ergeben sich Beziehungen, welche die Zusammenh{\"a}nge und Abh{\"a}ngigkeiten der Fachmodelle untereinander aufzeigen. Eine zugleich allgemeing{\"u}ltige sowie vollst{\"a}ndige Vordefinition des durch die Beziehungen beschriebenen Modellverbundes ist kaum m{\"o}glich. Zur rechnerinternen Abbildung erfolgt aus diesem Grund eine Zerlegung des Modellverbundes in Partialmodelle und entsprechende Verkn{\"u}pfungen. Die Beschaffenheit des Beziehungsgeflechtes h{\"a}ngt sowohl von der Qualit{\"a}t der Datenmodelle als auch von der Beschreibungsg{\"u}te der Verkn{\"u}pfungstypen, deren Definition ein hohes Maß an Fachwissen erfordern, ab. Mit einem Konzept zur Strukturierung und Zerlegung der Verbindungen in Basiselemente sowie der Integrationsm{\"o}glichkeit zu komplexeren Elementen wird eine einfachere Erstellung, Wartung und Anpassung von umfassenden baufachlichen Inhalten erm{\"o}glicht. Zur Sicherung einer hochwertigen Beschreibung des Modellverbundes ist ein an die F{\"a}higkeiten des Ingenieurs ausgerichteter Zugang zur Spezifikation und Anpassung der Beziehungsdefinitionen unverzichtbar.}, subject = {Ingenieurbau}, language = {de} } @inproceedings{BubnerThierfelder2000, author = {Bubner, Andre and Thierfelder, Jan}, title = {Austausch von planungsrelevanten Daten im Stahlbau}, doi = {10.25643/bauhaus-universitaet.614}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-6146}, year = {2000}, abstract = {Datenaustausch, Daten resp. Produktdatenmodelle sind seit mehreren Jahren Themen in der Forschung. Verschiedene Forschungsprojekte und Initiativen diverser Firmen f{\"u}hrten zu bereichs{\"u}bergreifenden Ans{\"a}tzen wie IFC und verschiedenen STEP-AP´s. Speziell im Stahlbau sind die Projekte >Produktschnittstelle Stahlbau< und >CIMsteel< entwickelt, weiterentwickelt und {\"u}berarbeitet worden. Als Weiterentwicklung der bisher existierenden Austauschformate versuchen neuere Ans{\"a}tze den Nutzen {\"u}ber die reine Daten{\"u}bermittlung hinaus zu erweitern. So integrieren diese L{\"o}sungsvorschl{\"a}ge Aspekte der Kommunikation, der Zusammenarbeit und des Managements. Des weiteren {\"u}bernehmen sie Aufgaben der Daten- und Modellverwaltung. Somit erfolgt eine digitale Abbildung unter Einbezug s{\"a}mtlicher ermittelter Daten. Resultierend aus den besonderen Randbedingungen im Bauwesen, wird ein Bauwerksmodell aus untereinander in Beziehung gesetzten Dom{\"a}nenmodellen aufgebaut}, subject = {Datenaustausch}, language = {de} } @article{BucherSchorling1997, author = {Bucher, Christian and Schorling, York}, title = {SLang - the Structural Language : Solving Nonlinear and Stochastic Problems in Structural Mechanics}, doi = {10.25643/bauhaus-universitaet.495}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4957}, year = {1997}, abstract = {Recent developments in structural mechanics indicate an increasing need of numerical methods to deal with stochasticity. This process started with the modeling of loading uncertainties. More recently, also system uncertainty, such as physical or geometrical imperfections are modeled in probabilistic terms. Clearly, this task requires close connenction of structural modeling with probabilistic modeling. Nonlinear effects are essential for a realistic description of the structural behavior. Since modern structural analysis relies quite heavily on the Finite Element Method, it seems to be quite reasonable to base stochastic structural analysis on this method. Commercially available software packages can cover deterministic structural analysis in a very wide range. However, the applicability of these packages to stochastic problems is rather limited. On the other hand, there is a number of highly specialized programs for probabilistic or reliability problems which can be used only in connection with rather simplistic structural models. In principle, there is the possibility to combine both kinds of software in order to achieve the goal. The major difficulty which then arises in practical computation is to define the most suitable way of transferring data between the programs. In order to circumvent these problems, the software package SLang (Structural Language) has been developed. SLang is a command interpreter which acts on a set of relatively complex commands. Each command takes input from and gives output to simple data structures (data objects), such as vectors and matrices. All commands communicate via these data objects which are stored in memory or on disk. The paper will show applications to structural engineering problems, in particular failure analysis of frames and shell structures with random loads and random imperfections. Both geometrical and physical nonlinearities are taken into account.}, subject = {Baustatik}, language = {en} } @inproceedings{BurghardtMeissner2000, author = {Burghardt, Michael and Meißner, Udo F.}, title = {Dreidimensionale Finite-Element-Baugrundmodelle f{\"u}r Ingeniuerprobleme}, doi = {10.25643/bauhaus-universitaet.575}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5750}, year = {2000}, abstract = {Bei komplexen Gr{\"u}ndungskonstruktionen sind Planungsfehler durch eine konsistente Modellierung vermeidbar. Manuelle Berechnungsmethoden erm{\"o}glichen im allgemeinen ein dreidimensionales Vorgehen nicht. Numerische Berechnungsmethoden, wie z.B. die Finite-Element-Methode, sind ein optimales Werkzeug zur ganzheitlichen Simulation des Problems. Die f{\"u}r die Finite-Element-Analyse notwendige Diskretisierung komplexer Bau- grundstrukturen ist manuell nicht zu bew{\"a}ltigen. Der vorliegende Beitrag zeigt wie ein Finite-Element-Modell automatisch aus einem geotechnischen Modell unter Ber{\"u}cksichtigung der spezifischen Anforderungen der Baugrund-Tragwerk-Struktur und des Bauablaufes erzeugt werden kann. Hierbei wird die Ber{\"u}cksichtigung der geometrischen und der mechanischen Besonderheiten bei der Netzgenerierung dargestellt.}, subject = {Baugrund}, language = {de} } @inproceedings{BedardMoraRivard2004, author = {B{\´e}dard, Claude and Mora, Rodrigo and Rivard, Hugues}, title = {A Framework for Computer-Aided Conceptual Design of Building Structures}, doi = {10.25643/bauhaus-universitaet.101}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1018}, year = {2004}, abstract = {This paper describes a framework for computer-aided conceptual design of building structures that results from building architectural considerations. The central task that is carried out during conceptual design is the synthesis of the structural system. This paper proposes a methodology for the synthesis of structural solutions. Given the nature of architectural constraints, user-model interactivity is devised as the most suitable computer methodology for driving the structural synthesis process. Taking advantage of the hierarchical organization of the structural system, this research proposes a top-down approach for structural synthesis. Through hierarchical refinement, the approach lends itself to the synthesis of global and local structural solutions. The components required for implementing the proposed methodology are briefly described. The main components have been incorporated in a proof-of-concept prototype that is being tested and validated with actual buildings.}, subject = {Konzipieren }, language = {en} } @inproceedings{BuergyGarrett2004, author = {B{\"u}rgy, Christian and Garrett, James H.}, title = {Supporting Domain Experts in Determining Viable User Interface Designs for Wearable Computers Used in AEC Work Situations}, doi = {10.25643/bauhaus-universitaet.116}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1168}, year = {2004}, abstract = {The design of mobile IT systems, especially the design of wearable computer systems, is a complex task that requires computer science knowledge, such as that related to hardware configuration and software development, in addition to knowledge of the domain in which the system is intended to be used. Particularly in the AEC sector, it is necessary that the support from mobile information technology fit the work situation at hand. Ideally, the domain expert alone can adjust the wearable computer system to achieve this fit without having to consult IT experts. In this paper, we describe a model that helps in transferring existing design knowledge from non-AEC domains to new projects in the construction area. The base for this is a model and a methodology that describes the usage scenarios of said computer systems in an application-neutral and domain-independent way. Thus, the actual design information and experience will be transferable between different applications and domains.}, subject = {Mobile Computing}, language = {en} } @inproceedings{Cacao2003, author = {Cacao, Isabel}, title = {Constructive Aspects of Monogenic Function Theory}, doi = {10.25643/bauhaus-universitaet.284}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2848}, year = {2003}, abstract = {As it is well known, the approximation theory of complex valued functions is one of the main fields in function theory. In general, several aspects of approximation and interpolation are only well understood by using methods of complex analysis. It seems natural to extend these techniques to higher dimensions by using Clifford Analysis methods or, more specific, in lower dimensions 3 or 4, by using tools of quaternionic analysis. One starting point for such attempts has to be the suitable choice of complete orthonormal function systems that should replace the holomorphic function systems used in the complex case. The aim of our contribuition is the construction of a complete orthonormal system of monogenic polynomials derived from a harmonic function system by using sistematically the generalized quaternionic derivative}, subject = {Komplexe Funktion}, language = {en} } @article{Caetano1997, author = {Caetano, A. M.}, title = {Eigenvalue Distribution for the Stokes Operator}, doi = {10.25643/bauhaus-universitaet.500}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5005}, year = {1997}, abstract = {The aim of this talk is to show that the methods used by M{\´e}tivier and Lapidus to study the eigenvalue distribution of elliptic operators (e.g., of the Dirichlet Laplacian) can be adapted to the study of the similar problem for the Stokes operator. In this way we get asymptotic formulae for the eigenvalues of the latter operator even in the case when the underlying domain has an extremely irregular (fractal) boundary. In the case the boundary is not that irregular (e.g., when it is Lipschitz) the estimates we obtain are much better than the ones we can find in the current literature.}, subject = {Stokes-Problem}, language = {en} } @inproceedings{Cerejeiras2003, author = {Cerejeiras, Paula}, title = {Hyperbolic Qp-scales}, doi = {10.25643/bauhaus-universitaet.285}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2853}, year = {2003}, abstract = {The Qp-scales were first introduced in [1] as interpolation spaces between the Bloch and Dirichlet spaces in the complex space. ... However, such treatment presents the disadvantage of only considering the Euclidean case. In order to obtain an approach to homogeneous hyperbolic manifolds, the projective model of Gel'fand was retaken in [2]. With the help of a convenient fundamental solution for the hyperbolic (homogeneous of degree ®) D® (see [5]) it was introduced in [7] and [3] equivalent Qp scales for homogeneous hyperbolic spaces. In this talk we shall present and study some properties of this hyperbolic scale.}, subject = {Quaternion}, language = {en} } @article{CerovsekTurk2004, author = {Cerovsek, Tomo and Turk, Ziga}, title = {Working Together: ICT Infrastructures to Support Collaboration}, doi = {10.25643/bauhaus-universitaet.205}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2055}, year = {2004}, abstract = {The paper summarizes a part of research carried out in ICCI project and provides a current review of ICT infrastructures supporting collaboration. It covers taxonomies, protocols, standards, components, typical subsystems as well as future trends and recommendation for two most important technologies with applications in AEC: (1) EIP (Enterprise information portal) - a single gateway to a company's information, knowledge base, and applications for all actors; (2) RTC (Real-Time Communication and Collaboration technologies) that provide means for asynchronous communication between geographically dislocated people using ICT. Proposed future developments are: orientation towards web services - with building information models, business intelligence, personalization, AEC information retrieval, p2p workspaces and grids.}, subject = {Informationstechnik}, language = {en} } @article{ChangChangHuang2004, author = {Chang, Chihyuan and Chang, Yuanchu and Huang, Shyhmeng}, title = {Application of a Agent Mechanism to the Small-scale Maintenance of School Buildings}, doi = {10.25643/bauhaus-universitaet.216}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2165}, year = {2004}, abstract = {This paper presents an agent-based software, Virtual Administrator System (VAS) for the smallscale maintenance of school buildings. VAS is capable of handling a heavy load of routine, lowtech maintenance jobs. It assigns a different priority to each job application according to its significance and urgency, and automatically adjusts schedules for maintenance engineers when on-site supervision is needed. The system can help ease off the burden of routine small-scale maintenance work, making it more cost-effective and efficient in the overall management of school building maintenance. VAS posts jobs on the Web in a multi-media format and classified all applications into four categories: the on-call maintenance contract, the term maintenance contract, the guaranty maintenance contract, and the regular maintenance contract. It then estimates their urgency level and passes the information to maintenance engineers who will decide whether on-site inspection is needed. Based on the engineers' feedback, VAS automatically implements the scheduling for inspection as well as sends out real-time or batch notifications to contractors. All these activities are recorded in a database to allow continuous research and data mining and the analysis and diagnosis of specific jobs for followup maintenance plans.}, subject = {Mehragentensystem}, language = {en} } @inproceedings{ChangwanHaasCaldas2004, author = {Changwan, Kim and Haas, Carl and Caldas, Carlos}, title = {Spatial data acquisition, integration, and modeling for real-time project life-cycle applications}, doi = {10.25643/bauhaus-universitaet.128}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1280}, year = {2004}, abstract = {Current methods for site modeling employs expensive laser range scanners that produce dense point clouds which require hours or days of post-processing to arrive at a finished model. While these methods produce very detailed models of the scanned scene, useful for obtaining as-built drawings of existing structures, the associated computational time burden precludes the methods from being used onsite for real-time decision-making. Moreover, in many project life-cycle applications, detailed models of objects are not needed. Results of earlier research conducted by the authors demonstrated novel, highly economical methods that reduce data acquisition time and the need for computationally intensive processing. These methods enable complete local area modeling in the order of a minute, and with sufficient accuracy for applications such as advanced equipment control, simple as-built site modeling, and real-time safety monitoring for construction equipment. This paper describes a research project that is investigating novel ways of acquiring, integrating, modeling, and analyzing project site spatial data that do not rely on dense, expensive laser scanning technology and that enable scalability and robustness for real-time, field deployment. Algorithms and methods for modeling objects of simple geometric shape (geometric primitives from a limited number of range points, as well as methods provide a foundation for further development required to address more complex site situations, especially if dynamic site information (motion of personnel and equipment). Field experiments are being conducted to establish performance parameters and validation for the proposed methods and models. Initial experimental work has demonstrated the feasibility of this approach.}, subject = {Bauwerk}, language = {en} } @inproceedings{ChenKongLietal.2004, author = {Chen, Zhen and Kong, Stephen and Li, Heng and Xu, Qian}, title = {Evaluating IT Applications for Innovative Construction Management}, doi = {10.25643/bauhaus-universitaet.99}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-994}, year = {2004}, abstract = {The construction management has been under pressure to reduce operating costs and to improve productivity using innovative information technologe (IT) solutions conformed to structural characteristics, site conditions and past experiences. Given the growing emphasis on effectiveness and efficiency in construction projects, there is an imminent need to develop a formal procedure to select the best IT application for each proposed construction project and research and development (R\&D) project. As there are numerous factors that have to be considered in selecting appropriate IT in a given situation, decision-makers need to have multicriteria decision-making ability. To enable them to make the most appropriate decision in any situation, it is important that effective tools incorporating multicriteria decision-making techniques are available. In this paper, an Analytic Network Process (ANP) model is conducted for the selection of appropriate IT application for innovative construction management prior to construction or research. The paper concludes that the ANP is a viable and capable tool for conducting IT application selection in multicriteria decision-making environment.}, subject = {Bauf{\"u}hrung}, language = {en} } @inproceedings{ChengLauLaw2004, author = {Cheng, Jinxing and Lau, Gloria and Law, Kincho}, title = {A simulation access language and framework for project management applications}, doi = {10.25643/bauhaus-universitaet.156}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1567}, year = {2004}, abstract = {As computer programs become ever more complex, software development has shifted from focusing on programming towards focusing on integration. This paper describes a simulation access language (SimAL) that can be used to access and compose software applications over the Internet. Specifically, the framework is developed for the integration of tools for project management applications. The infrastructure allows users to specify and to use existing heterogeneous tools (e.g., Microsoft Project, Microsoft Excel, Primavera Project Planner, and AutoCAD) for simulation of project scenarios. This paper describes the components of the SimAL language and the implementation efforts required in the development of the SimAL framework. An illustration example bringing on-line weather forecasting service for project scheduling and management applications is provided to demonstrate the use of the simulation language and the infrastructure framework.}, subject = {Hochschulbildung}, language = {en} } @inproceedings{CheungNoruziaanLi2004, author = {Cheung, Moe M. S. and Noruziaan, Bahman and Li, W. C.}, title = {Data acquisition, processing and management systems for a Canadian bridge monitoring project}, doi = {10.25643/bauhaus-universitaet.123}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1235}, year = {2004}, abstract = {This paper will present a number of technical aspects for one of the most elaborate instrumentation and data acquisition projects ever undertaken in Canada. Confederation Bridge, the longest bridge built over ice covered seawater has been equipped with the state of the art data acquistition devices and systems as well as data transfer networks. The Bridge has been providing a fixed surface connection between Prince Edward Island and Province of New Brunswick in Canada since its opening in 1997. The Bridge has a rather long design service life of 100 years. Because of its large size and long span length, its design is not covered by any existing codes or standards worldwide. The focus of the paper is to introduce the data acquisition, transfer, processing and management systems. The instrumentation and communications infrastructure and devices will be presented in some details along with the data processing and management systems and techniques. Teams of engineers and researchers use the collected data to verify the analysis and design assumptions and parameters as well as investigate the short-term and long-term behaviour and health of the Bridge. The collected data are also used in furthering research activities in the field of bridge engineering and in elevating our knowledge about behaviour, reliability and durability of such complex structures, their components and materials.}, subject = {Bauwerk}, language = {en} } @inproceedings{ChouHsieh2004, author = {Chou, Yu-Hur and Hsieh, Shang-Hsien}, title = {Design of Partial Scoring Assessment System for Reinforcement Concrete Design Course : Development of Partial Scoring Assessment System for Reinforcement Concrete Design Course}, doi = {10.25643/bauhaus-universitaet.90}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-905}, year = {2004}, abstract = {In the field of Civil Engineering, the content of reinforcement concrete design course (RC course) has complicated design procedures and many difficult specifications to recognize, so most of the students regard the RC course a tough course, and teachers very often find the class time insufficient. Also, teachers of the RC course usually spend a lot of time in organizing the examinations for handling tedious calculations and complicated logical reasoning. Furthermore, correcting examination papers with partial scoring takes even more time of the teacher's. Therefore, the objective of this research is to design and develop a partial scoring assessment system to meet the needs in engineering design courses, such as the RC course. This assessment system can generate test items with variable parameters. It also supports inference diagnosis on the examinee's misconceptions and gives partial scores in grading the examination. In this research, the example test subject is the analysis of rectangular reinforced concrete beam with single layer steel bars.}, subject = {Bautechnik}, language = {en} } @inproceedings{ChristovPetkov2000, author = {Christov, Christo T. and Petkov, Zdravko B.}, title = {DETERMINATION OF THE DYNAMIC STRESS INTENSITY FACTOR USING ADVANCED ENERGY RELEASE EVALUATION}, doi = {10.25643/bauhaus-universitaet.577}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5770}, year = {2000}, abstract = {In this study a simple effective procedure practically based upon the FEM for determination of the dynamic stress intensity factor (DSIF) depending on the input frequency and using an advanced strain energy release evaluation by the simultaneous release of a set of fictitious nodal spring links near the crack tip is developed and applied. The DSIF is expressed in terms of the released energy per unit crack length. The formulations of the linear fracture mechanics are accepted. This technique is theoretically based upon the eigenvalue problem for assessment of the spring stiffnesses and on the modal decomposition of the crack shape. The inertial effects are included into the released energy. A linear elastic material, time-dependent loading of sine type and steady state response of the structure are assumed. The procedure allows the opening, sliding and mixed modes of the structure fracture to be studied. This rational and powerful technique requires a mesh refinement near the crack tip. A numerical test example of a square notched steel plate under tension is given. Opening mode of fracture is studied only. The DSIF is calculated using a coarse mesh and a single node release for the released energy computation as well a fine mesh and simultaneous release of four links for more accurate values. The results are analyzed. Comparisons with the known exact results from a static loading are presented. Conclusions are derived. The values of the DSIF are significantly larger than the values of the corresponding static SIF. Significant peaks of the DSIF are observed near the natural frequences. This approach is general, practicable, reliable and versatile.}, subject = {Bruchmechanik}, language = {en} } @inproceedings{ChristovPetrova1997, author = {Christov, Christo T. and Petrova, Lyllia B.}, title = {Computer-Aided Static Analysis of Complex Prismatic Orthotropic Shell Structures by the Analytical Finite Strip Method}, doi = {10.25643/bauhaus-universitaet.435}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4358}, year = {1997}, abstract = {The paper describes a development of the analytical finite strip method (FSM) in displacements for linear elastic static analysis of simply supported at their transverse ends complex orthotropic prismatic shell structures with arbitrary open or closed deformable contour of the cross-section under general external loads. A number of bridge top structures, some roof structures and others are related to the studied class. By longitudinal sections the prismatic thin-walled structure is discretized to a limited number of plane straight strips which are connected continuously at their longitudinal ends to linear joints. As basic unknowns are assumed the three displacements of points from the joint lines and the rotation to these lines. In longitudinal direction of the strips the unknown quantities and external loads are presented by single Fourier series. In transverse direction of each strips the unknown values are expressed by hyperbolic functions presenting an exact solution of the corresponding differential equations of the plane straight strip. The basic equations and relations for the membrane state, for the bending state and for the total state of the finite strip are obtained. The rigidity matrix of the strip in the local and global co-ordinate systems is derived. The basic relations of the structure are given and the general stages of the analytical FSM are traced. For long structures FSM is more efficient than the classic finite element method (FEM), since the problem dimension is reduced by one and the number of unknowns decreases. In comparison with the semi-analytical FSM, the analytical FSM leads to a practically precise solution, especially for wider strips, and provides compatibility of the displacements and internal forces along the longitudinal linear joints.}, subject = {Tragwerk}, language = {en} } @inproceedings{ChristovPetrova2000, author = {Christov, Christo T. and Petrova, Lyllia B.}, title = {COMPARISON OF SOME VARIANTS OF THE FINITE STRIP METHOD FOR ANALYSIS OF COMPLEX SHELL STRUCTURES}, doi = {10.25643/bauhaus-universitaet.576}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5760}, year = {2000}, abstract = {The subject of this paper is to explore and evaluate the semi-analytical, analytical and numerical versions of the finite strip method (FSM) for static, dynamic and stability analyses of complex thin-walled structures. Many of bridge superstructures, some roof and floor structures, reservoirs, channels, tunnels, subways, layered shells and plates etc. can be analysed by this method. In both semi-analytical and analytical variants beam eigenvalue vibration or stability functions, orthogonal polynomials, products of these functions are used as longitudinal functions of the unknowns. In the numerical FSM spline longitudinal displacement functions are implemented. In the semi-analytical and numerical FSM conventional transverse shape functions for displacements are used. In the analytical FSM the accurate function of the strip normal displacement and the plane stress function are applied. These three basic variants of the FSM are compared in quality and quantity in view to the following: basic ideas, modelling, unknowns, DOF, a kind and order of the strips, longitudinal and transverse displacement and stress functions, compatibility requirements, boundary conditions, ways for obtaining of the strip stiffness and load matrices, a kind and size of the structure stiffness matrix and its band width, mesh density, necessary number of terms in length, accuracy and convergence of the stresses and displacements, approaches for refining results, input and output data, computer resources used, application area, closeness to other methods, options for future development. Numerical example is presented. Advantages and shortcomings are pointed. Conclusions are given.}, subject = {Schale}, language = {en} } @inproceedings{ChudobaButenwegPfeiffer2003, author = {Chudoba, Rostislav and Butenweg, Christoph and Pfeiffer, Frank}, title = {Textile Reinforced Concrete Part I: Process Model for Collaborative Research and Development}, doi = {10.25643/bauhaus-universitaet.286}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2866}, year = {2003}, abstract = {The goal of the collaborative research center (SFB 532) >Textile reinforced concrete (TRC): the basis for the development of a new material technology< installed in 1998 at the Aachen University is a complex assessment of mechanical, chemical, economical and productional aspects in an interdisciplinary environment. The research project involves 10 institutes performing parallel research in 17 projects. The coordination of such a research process requires effective software support for information sharing in form of data exchange, data analysis and data archival. Furthermore, the processes of experiment planning and design, modification of material compositions and design parameters and development of new material models in such an environment call for systematic coordination applying the concepts of operational research. Flexible organization of the data coming from several sources is a crucial premise for a transparent accumulation of knowledge and, thus, for a successful research in a long run. The technical information system (TRC-TIS) developed in the SFB 532 has been implemented as a database-powered web server with a transparent definition of the product and process model. It serves as an intranet server with access domains devoted to the involved research groups. At the same time, it allows the presentation of selected results just by granting a data object an access from the public area of the server via internet.}, subject = {Beton}, language = {en} } @inproceedings{ContensinMaltret1997, author = {Contensin, M. and Maltret, J.-L.}, title = {Computer Aided Lighting for architects and designers}, doi = {10.25643/bauhaus-universitaet.448}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4488}, year = {1997}, abstract = {Designing lightings in a 3D-scene is a general complex task for building conception as it is submitted to many constraints such as aesthetics or ergonomics. This is often achieved by experimental trials until reaching an acceptable result. Several rendering softwares (such as Radiance) allow an accurate computation of lighting for each point in a scene, but this is a long process and any modification requires the whole scene to be rendered again to get the result. The first guess is empirical, provided by experience of the operator and rarely submitted to scientific considerations. Our aim is to provide a tool for helping designers to achieve this work in the scope of global illumination. We consider the problem when some data are asked for : on one hand the mean lighting in some zones (for example on a desktop) and on the other hand some qualitative information about location of sources (spotlights on the ceiling, halogens on north wall,...). The system we are conceiving computes the number of light sources, their position and intensities, in order to obtain the lighting effects defined by the user. The algorithms that we use bind together radiosity computations with resolution of a system of constraints.}, subject = {Architektur}, language = {en} } @phdthesis{Coulon1997, author = {Coulon, Carl-Helmut}, title = {Strukurorientiertes Fallbasiertes Schließen}, doi = {10.25643/bauhaus-universitaet.24}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20040212-265}, school = {Bauhaus-Universit{\"a}t Weimar}, year = {1997}, abstract = {Das Ziel dieser Arbeit war es, durch Verwendung geeigneter vorhandener CAD-Pl{\"a}ne die Bearbeitung neuer CAD-Pl{\"a}ne zu unterst{\"u}tzen. Entstanden ist ein generischer Ansatz zum fallbasierten Schließens. Da in CAD-Pl{\"a}nen die r{\"a}umliche Struktur eine wichtige Rolle spielt, ist das Konzept auf strukturorientierte Anwendungen ausgerichtet. Deshalb bezeichne ich es als ein Konzept zum " strukturorientierten fallbasierten Schließen". Die Arbeit spezifiziert das Minimum an Wissen, welches zur Suche und Wiederverwendung von F{\"a}llen ben{\"o}tigt wird, wie das dar{\"u}ber hinausgehende Wissen verarbeitet wird, welche Zusammenh{\"a}nge es zum Beispiel zwischen Vergleichs- und Anpassungswissen gibt und wie man das Wissen modellieren kann. Zur Erl{\"a}uterung wird das ben{\"o}tigte Wissen anhand verschiedener Anwendungen dargestellt. Das in der Arbeit vorgestellte Konzept erlaubt die Erg{\"a}nzung, Detaillierung und Korrektur einer Anfrage. Die beiden entscheidenden Algorithmen dienen dem Vergleich von Anfrage und Fall und der Anpassung der Information des Falles zur Modifikation der Anfrage.}, subject = {Fallbasiertes Schließen}, language = {de} } @inproceedings{Counsell2000, author = {Counsell, John}, title = {Spatial Database Management and Generation of VRML Models}, doi = {10.25643/bauhaus-universitaet.579}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5791}, year = {2000}, abstract = {The cost of keeping large area urban computer aided architectural design (CAAD) models up to date justifies wider use and access. This paper reviews the potential for collaborative groupwork creation and maintenance of such models and suggests an approach to data entry, data management and generation of appropriate levels of detail models from a Geographic Information System (GIS). Staff at the University of the West of England (UWE) modelled a large area of Bristol to demonstrate millennium landmark proposals. It became swiftly apparent that continued amendment of the model to keep it an accurate reflection of changes on the ground was a major data management problem. Piecing in new CAAD models received from Architectural Practices to visualise them in context as part of the planning negotiation process has often taken staff several days of work for each instance. The model is so complex and proprietary that Bristol City operates a specialist visualisation bureau service. UWE later modelled the environs of the Tower of London to support bids for funding and to provide the context for judging the visual impact of iterative design development. Further research continued to develop more effective approaches to. Data conversion and amalgamation from all the diverse sources was the major impediment to effective group working to create the models. It became apparent that a GIS would assist retrieving all the appropriate data that described the part of the model under creation. It was possible to predict that management of many historic part models stepping back through time, allowing for different expert interpretations to co-exist would be in itself a major task requiring a spatial database/GIS. UWE started afresh from the original source data, to explore the collaborative use of GIS and Virtual Reality Modelling Language (VRML) to integrate models and interventions from various sources and to generate an overall navigable interactive whole. Current exploration of the combination of event driven behaviours and Structured Query Language is seeking to define how appropriately to modify objects in the VRML model on demand. This is beginning to realise the potential for use of this process for: asynchronous group modelling on the lines of a collaborative virtual design studio; historic building maintenance management; visitor management; interpretation of historic sites to visitors and public planning information.}, subject = {Raumordnung}, language = {en} } @inproceedings{DaniunasKomkaWerner2000, author = {Daniunas, A. and Komka, A. and Werner, F.}, title = {ANALYSIS AND DETERMINATION OF STRENGTH IN PLASTIC STAGE OF FREE FORM STEEL SHAPES}, doi = {10.25643/bauhaus-universitaet.580}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5803}, year = {2000}, abstract = {The steel structure design codes require to check up the member strength when evaluating plastic deformations. The model of perfectly plastic material is accepted. The strength criteria for simple cross-sections (I section, etc.) of steel members are given in design codes. The analytical strength criteria for steel cross-sections and numerical approaches based on stepwise procedure are investigated in many articles. Another way for checking the carrying capacity of cross-sections is the use of methods that are applied for defining strain-deformed state of elastic perfectly plastic systems. In this paper non-iterative methods are suggested for checking strength of cross-sections. Carrying capacity of cross section is verified according to extremum principle of plastic fail under monotonically loading and the strain-deformed state of cross-section is defined according to extremum energy principals of elastic potential of residual stresses and complementary work of residual displacements. The mathematical expressions of these principals for discrete cross-section are formulated as problems of convex mathematical programming. The cross-section of steel member using finite element method is divided into free form plane elements. The constant distribution of stresses along the finite element is accepted. The relationships of finite elements for static formulation of the problem are formed so, that kinematics formulation relationships could be obtained in a formal way using the theory of duality. Numerical examples of determination of cross-section strength, composition of interactive curves and composition of moment-curvature curves for different axial force levels are presented.}, subject = {Stahlkonstruktion}, language = {en} } @inproceedings{DiazMeissnerSchoenenborn1997, author = {Diaz, Joaquin and Meißner, Udo F. and Sch{\"o}nenborn, I.}, title = {Modellierung zeitabh{\"a}ngiger 3D-Modelle in der Geotechnik}, doi = {10.25643/bauhaus-universitaet.432}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4324}, year = {1997}, abstract = {Aufgrund der steigenden quantitativen und qualitativen Anforderungen an den Bauplanungsprozeß wird in den letzten Jahren nach neuen L{\"o}sungsans{\"a}tzen gesucht, mit deren Hilfe der Bauplanungsprozeß den gestiegenen Anforderungen angepaßt werden kann. Ein L{\"o}sungsansatz hierzu stellt die durchg{\"a}ngig computergest{\"u}tzte, dreidimensionale und zeitabh{\"a}ngige Modellierung und Verwaltung des Bauplanungsprozesses beginnend bei der Vorplanung bis hin zum Recycling des Bauobjektes am Ende seiner Lebensdauer dar. Der vorliegende Beitrag zeigt auf, daß gerade der zeitliche Verlauf innerhalb einer geotechnischen Aufgabenstellung einen nicht unerheblichen Einfluß auf die verwendeten Modelle bzw. die Durchf{\"u}hrung von Sicherheitsnachweisen aus{\"u}bt. F{\"u}r die Entwicklung geotechnischer Softwaresysteme ergibt sich daraus schon innerhalb der Analysephase die Anforderung, die zeitkritischen Abh{\"a}ngigkeiten zu modellieren und entsprechend im Entwurf zu ber{\"u}cksichtigen. Hierf{\"u}r hat sich die objektorientierte Methode in Form des Objektmodells und des dynamischen Modells nach Rumbaugh als ein geeignetes Werkzeug herausgestellt. Die dabei gewonnenen Erkenntnisse und Ergebnisse k{\"o}nnen bereits sehr fr{\"u}h in die Konzeption des Gesamtsystems mit einbezogen werden. Am Beispiel des Geotechnischen Informationssystems (GTIS) f{\"u}hrte dies zu einer raum- und zeitabh{\"a}ngigen Verwaltung des Boden- und Konstruktionsmodells und zu einer Bauablaufsteuerung, innerhalb derer die einzelnen Bauzust{\"a}nde verwaltet und mit den entsprechenden Auspr{\"a}gungen innerhalb des dreidimensionalen Boden- und Konstruktionsmodells verkn{\"u}pft werden k{\"o}nnen.}, subject = {Geotechnik}, language = {de} } @inproceedings{DonathLiedtkePetzold2000, author = {Donath, Dirk and Liedtke, Maren and Petzold, Frank}, title = {Aktuelle Ger{\"a}te und IT - Unterst{\"u}tzung in der architektonischen Bestandsaufnahme - Grenzen, M{\"o}glichkeiten \& Visionen}, doi = {10.25643/bauhaus-universitaet.622}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-6220}, year = {2000}, abstract = {Im Rahmen des Sonderforschungsbereiches 524 ist das prim{\"a}re Anliegen des Teilprojektes D2 die Entwicklung von Methoden und Techniken zur Aufnahme von Bestandsdaten vor Ort oder durch Auswertung vorhandener Dokumentationen und deren direkte Integration in ein Bauwerksmodell. [15] Das Vorhaben erarbeitet Grundlagen zu Aspekten der fachplanerischen Nutzung und der wissenschaftlichen Auswertungen arbeitsmethodischer Vorgehensweisen in der Bestandsaufnahme unter Einbeziehung softwaretechnischer Methoden. Dabei finden Sachverhalte der Strukturierung, die Herausarbeitung von Systematiken der wesentlichen Informations-/Datenmengen, die Ableitung von Methoden zur zerst{\"o}rungsfreien Erfassung und die Darstellung planungsrelevanter Geb{\"a}udeinformationen in digitalen Systemen Ber{\"u}cksichtigung. Beim Bauaufmaß werden neben traditionellen Methoden und Techniken l{\"a}ngst geod{\"a}tische Verfahren wie die Tachymetrie, die Photogrammetrie und die Handlaserentfernungsmessung einbezogen. In der Praxis des Bestandsaufmaßes repr{\"a}sentiert gegenw{\"a}rtig die Tachymetrie, das am h{\"a}ufigsten zur Innen- und Außenaufnahme von Geb{\"a}uden eingesetzte geod{\"a}tische Vermessungsverfahren. [9] [3] Ausgehend von der heutigen Situation in der Bestandsaufnahme wird aufgezeigt, inwieweit es nach dem gegenw{\"a}rtigen Stand der Technik m{\"o}glich ist, die in der Geod{\"a}sie verwendeten Tachymeter direkt in der Bestandsaufnahme einzusetzen. In einem weiteren Schwerpunkt wird die Konzeption eines rechnergest{\"u}tzten Bauaufnahmesystems basierend auf reflektorlos messenden tachymetrischen Ger{\"a}ten beschrieben. Das Konzept ber{\"u}cksichtigt nicht nur das Bauaufmaß, sondern unterst{\"u}tzt ad{\"a}quat den gesamten Prozeß der Bauaufnahme - von der Erstbegehung bis hin zur konstruktiven Gliederung. Abschließend werden tendenzielle M{\"o}glichkeiten in der Bauaufnahme diskutiert.}, subject = {Bauaufnahme}, language = {de} } @article{DonathPetzold1997, author = {Donath, Dirk and Petzold, Frank}, title = {Zuk{\"u}nftige Techniken f{\"u}r eine computergest{\"u}tzte Planungspraxis - applikative Tools f{\"u}r die architektonische Bestandserfassung}, doi = {10.25643/bauhaus-universitaet.496}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4962}, year = {1997}, abstract = {Der Beitrag beschreibt die Entwicklung eines Softwaresystems zur strukturierten Erfassung und Verwaltung bestehender Geb{\"a}ude in der Architektur. Die Erfassung erfolgt durch die Aufnahme von geometrischen Daten und Sachdaten in unterschiedlichen Abstraktionsstufen unter Einbeziehung einer vorangehenden Dekomposition. Basis f{\"u}r die Entwicklung eines solchen Systems ist die Analyse und Systematik der Erfassungstechniken, -abl{\"a}ufe und der Gegenstand der architektonischen Bestandsaufnahme. Parallel hierzu erfolgt die Bewertung und Nutzung aktueller Techniken und Werkzeuge der applikativen Informatik. Schwerpunkte der Forschungsarbeit sind die Ableitung einer allgemeinen Geb{\"a}ude- und Bauteilstruktur, die Einbeziehung aktueller informationstechnischer Verfahren und Werkzeuge und die Entwicklung eines entsprechenden Experimentalsystems. Auf eine Auswahl softwaretechnischer Entwicklungen wird n{\"a}her eingegangen (objektspezifische Eigenschaften, flexible Geometrieerfassung und Benutzeroberfl{\"a}chen).}, subject = {Bauaufnahme}, language = {de} } @inproceedings{DonathPetzoldTscherepanowetal.2000, author = {Donath, Dirk and Petzold, Frank and Tscherepanow, Ronald and Thurow, Torsten}, title = {Geometrieabbildung in der planungsrelevanten Bauaufnahme}, doi = {10.25643/bauhaus-universitaet.621}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-6214}, year = {2000}, abstract = {Im Rahmen des Sonderforschungsbereiches 524 "Konstruktionen und Werkstoffe f{\"u}r die Revitalisierung von Bauwerken"1 ist das prim{\"a}re Anliegen des Teilprojektes D2 „Bauplanungsrelevantes digitales Geb{\"a}udeaufnahme- und Informationssystem" die Entwicklung von Methoden und Techniken zur Aufnahme von Bestandsdaten vor Ort oder durch Auswertung vorhandener Dokumentationen und deren direkte Integration in ein Bauwerksmodell [11]. Das Vorhaben erarbeitet Grundlagen zu Aspekten der fachplanerischen Nutzung und der wissenschaftlichen Auswertungen arbeitsmethodischer Vorgehensweisen in der Bestandsaufnahme unter Einbeziehung softwaretechnischer Methoden. Dabei finden Sachverhalte der Strukturierung, die Herausarbeitung von Systematiken der wesentlichen Informations-/Datenmengen, die Ableitung von Methoden zur zerst{\"o}rungsfreien Erfassung und die Darstellung planungsrelevanter Geb{\"a}udeinformationen in digitalen Systemen Ber{\"u}cksichtigung. In diesem Artikel werden ausgehend von Anforderungen der planungsrelevanten architektonischen Bauaufnahme eine Konzeption und die prototypische Realisierung zur flexiblen geometrischen Erfassung - dem Bauaufmaß - vorgestellt. Planungsrelevante Bauaufnahme Die Bauaufnahme dient der Modellbildung durch Erfassung und Wiedergabe eines real existenten Bauwerkes in seinem zum Zeitpunkt der Aufnahme angetroffenen Zustand. Die quasi vollst{\"a}ndige Aufnahme ist aufgrund der großen zu ermittelnden Datenmengen und den hierdurch entstehenden Aufwendungen und Kosten nicht m{\"o}glich [8]. Vielmehr muß eine Auswahl und Abstrahierung der aufzunehmenden Daten, ihrer Repr{\"a}sentation und die Wahl ihrer Genauigkeit nach den Erfordernissen des jeweiligen Verwendungszweckes der Bauaufnahme erfolgen. So vielf{\"a}ltig die Erfordernisse einer Bauaufnahme ausfallen, so vielf{\"a}ltig sind auch die jeweiligen Forderungen und Auswahlen der aufzunehmenden Daten. In der {\"u}berwiegenden Mehrheit aller F{\"a}lle ist auch die Wiedergabe der vorgefundenen geometrischen Auspr{\"a}gung des Bauwerkes gew{\"u}nscht oder erforderlich. Dabei werden unterschiedliche Genauigkeitsanforderungen an verschiedene Bereiche des Bauwerkes gestellt [9] [10]. So reicht vielleicht im Einzelfall eine skizzenhafte Wiedergabe des Umfeldes eines geplanten Ladenbereiches, w{\"a}hrend die umzunutzenden Bereiche in Ausf{\"u}hrungsgenauigkeit zu erfassen sind. Die exakte geometrische Auspr{\"a}gung eingebauter Bauelemente ist oft nur teilweise bekannt. In der Bauaufnahme muß ein enger Zusammenhang zwischen Geometrie und bauteilorientierter Konstruktion, sowie den verwendeten Ordnungssystemen bestehen. Um diesen Anspr{\"u}chen gen{\"u}ge zu tragen, werden entsprechende Aufnahmetechniken, rechnerinterne Abbildungen und Funktionalit{\"a}t zur Interaktion Nutzer - Modell gesucht.}, subject = {Bauplanung}, language = {de} } @inproceedings{DonathTonn2004, author = {Donath, Dirk and Tonn, Christian}, title = {Plausibility in Architectural Design - Software Support for the Architect-oriented Design of Colour Schemes for Interiors and Buildings}, doi = {10.25643/bauhaus-universitaet.149}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1498}, year = {2004}, abstract = {The approach discussed here is part of research into an overall concept for digital instruments which support the entire planning process and help in enabling planning decisions to be based upon clear reasoning and plausible arguments. Such specialist systems must take into account currently available technology, such as networked working patterns, object-orientation, building and product models as well as the working method of the planner. The paper describes a plausibility instrument for the formulation of colour scheme proposals for building interiors and elevations. With the help of intuitively usable light simulations, colour, material and spatial concepts can be assessed realistically. The software prototype "Coloured Architecture" is conceived as a professional extension to conventional design tools for the modelling of buildings. As such it can be used by the architect in the earliest design phases of the planning process as well as for colour implementation on location.}, subject = {CAD / Architektur}, language = {en} } @inproceedings{DuckeEcksteinMontag2000, author = {Ducke, M. and Eckstein, U. and Montag, U.}, title = {Die Eisenbahnbr{\"u}cken des Lehrter Bahnhofs in Berlin - Ein ganzheitliches FE-Berechnungskonzept}, doi = {10.25643/bauhaus-universitaet.581}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5812}, year = {2000}, abstract = {Der Komplexit{\"a}t moderner Br{\"u}ckenbauwerke scheinen die verwendeten Berechungsmodelle oft nicht angemessen. Tragwerksberechnungen basieren in vielen F{\"a}llen noch auf der Vorgehensweise, das Br{\"u}ckenbauwerk in Einzelbauteile zu zerlegen und mit unterschiedlichen Teilmodellen zu behandeln. Das erscheint, auch vor dem Hintergrund st{\"a}ndig wachsender Rechnerleistung, nicht mehr zeitgem{\"a}ß. Dies gilt zum Beispiel auch f{\"u}r die g{\"a}ngige Praxis, fl{\"a}chenhafte Br{\"u}cken{\"u}berbauten mit Balkenmodellen zu berechnen. Der vorliegende Beitrag stellt ein ganzheitliches Berech-nungskonzept vor, welches auf der Basis eines einzigen FE-Modells die Berechnung des Gesamtbauwerks erlaubt. Damit wird f{\"u}r alle Bauteile neben der Zustandsgr{\"o}ßenberechnung auch die Bemessung von Stahl- und Spannbetonbauteilen bis hin zu Nachweisen wie zur Beschr{\"a}nkung der Rissbreite gef{\"u}hrt. Die Anwendung dieses Berechnungskonzeptes wird am Beispiel der Eisenbahn{\"u}berf{\"u}hrung des neuen Lehrter Bahn-hofs in Berlin gezeigt. Das verwendete FE-Modell umfasst Baugrund, Fundamente, Stahl- bzw. Gußstahlunterkonstruktion sowie den Stahl- bzw. Spannbeton{\"u}berbau. Besonderheiten sind unter anderem die Modellierung des plattenbalkenartigen {\"U}berbaus durch exzentrische, vorspannbare Schalenelemente und das getrennte Vorhalten von tragwerks- und lastbezogenen Eingabefiles. Damit gelingt die sequentielle Erfassung unterschiedlicher Bettungsmoduli zur Simulation statischer und dynamischer Beanspruchungen, die Ber{\"u}cksichtigung des Anspannens und der Interaktion zwischen vorgespannten Stahlverb{\"a}nden zur Aufnahme von Horizontallasten sowie die Ber{\"u}cksichtigung unterschiedlicher statischer Systeme bei der Herstellung des Spannbeton{\"u}berbaus.}, subject = {Berlin}, language = {de} } @article{Dudek1997, author = {Dudek, Mariusz}, title = {Zur Bewertung der Struktur von Verkehrsnetzen}, doi = {10.25643/bauhaus-universitaet.463}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4634}, year = {1997}, abstract = {In diese Ver{\"o}ffentlichung werden die Kennziffern dargestellt, die zur Beurteilung der Struktur von Verkehrsnetzen behilflich sein k{\"o}nnen. Zu diesem Zweck wurde die Graphentheorie angewendet. Eine erste Gruppe von Bewertungen st{\"u}tzt sich auf die Anzahl der Knoten und B{\"o}gen des Netzes. Detailliertere Informationen {\"u}ber Engp{\"a}sse oder Schwachstellen im Verkehrsnetz erh{\"a}lt man durch die Analyse der Kantenzusammenhangs. Die Unabh{\"a}ngigkeit der einzelnen Verkehrsarten , ihre Bewertung und Maßnahmen, sie zu verbessern werden vorgeschlagen und diskutiert. Weiteren Untersuchungen werden angeregt.}, subject = {Verkehrsnetz}, language = {de} } @article{Dudek1997, author = {Dudek, Mariusz}, title = {Modellierung der Verkehrsmittelwahl}, doi = {10.25643/bauhaus-universitaet.481}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4817}, year = {1997}, abstract = {Die Zielstellung der Modal­Split­Betrachtungen l{\"a}uft darauf hinaus, Entscheidungs-kriterien zu erarbeiten, nach denen die einzelnen Personen ihre Verkehrsmittel ausw{\"a}hlen. In dieser Ver{\"o}ffentlichung wurden alle drei Gruppen der Modelle (klassische, verhaltensorientierte und der Analyse) der Verkehrsaufteilung kurz charakterisiert. Dann wurden vier ausgew{\"a}hlte Modelle genauer beschrieben. Zum Schluß wird das Modell der Verkehrsmittelwahl dargestellt , das f{\"u}r die Untersuchung der Verkehrsaufteilung in Krakau verwendet wurde .}, subject = {Verkehrsmittelwahl}, language = {de} } @inproceedings{DudekRichter2003, author = {Dudek, Mariusz and Richter, Matthias}, title = {Zuverl{\"a}ssigkeit und strukturelle Parameter von Verkehrsnetzen}, doi = {10.25643/bauhaus-universitaet.295}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2951}, year = {2003}, abstract = {Im Vortrag wird der Frage nachgegangen, inwieweit ein Zusammenhang zwischen der Zuverl{\"a}ssigkeit und gewissen strukturellen Parametern eines Verkehrsnetzes besteht. Das Verkehrsnetz wird hierzu als bewerteter Graph aufgefasst. Zur Analyse der Verkehrsnetzzuverl{\"a}ssigkeit werden die Kanten mit ihren Verf{\"u}gbarkeiten (>Zuverl{\"a}ssigkeiten<) bewertet. Die Zuverl{\"a}ssigkeit des Verkehrsnetzes hat einen großen Einfluss auf die Beurteilung des Straßennetzes. Im Sinne einer Regressionsanalyse soll der Zusammenhang mit weiteren, speziell f{\"u}r die Betrachtung von Verkehrsnetzen entwickelten strukturellen Kenngr{\"o}ßen untersucht werden, das sind insbesondere die Dispersion des Verkehrsnetzes und die Unterentwicklung des Netzes. Aus der Vielzahl der theoretisch denkbaren Verkehrsnetzstrukturen spiegelt die Ring-Radius-Struktur die realen Straßennetze am besten wider. Solche Ring-Radius-Strukturen kommen in vielen St{\"a}dten vor. Die Berechnung der Verkehrsnetzzuverl{\"a}ssigkeit erfolgt mittels eines Algorithmus, der auf dem Prinzip der vollst{\"a}ndigen Enumeration aller m{\"o}glichen Kombinationen der Verf{\"u}gbarkeit bzw. Nichtverf{\"u}gbarkeit der einzelnen Kanten basiert und die gew{\"u}nschte Kenngr{\"o}ße exakt bestimmt. Obwohl der Algorithmus speziell auf eine m{\"o}glichst geringe Rechenzeit ausgerichtet ist, bleibt das Verfahren doch numerisch recht aufwendig. An Hand von zehn verschiedenen Ring-Radius-Strukturen wird der Nachweis eines Zusammenhangs zwischen den strukturellen Kenngr{\"o}ßen und der Verkehrsnetzzuverl{\"a}ssigkeit gef{\"u}hrt. Damit k{\"o}nnen mittels struktureller Bewertungen (die mit einem vergleichsweise geringen Aufwand an Input-Daten und Rechenzeit bestimmbar sind) Aussagen {\"u}ber die Zuverl{\"a}ssigkeit des Verkehrsnetzes getroffen werden.}, subject = {Verkehrsnetz}, language = {de} } @inproceedings{DudekRudnickiHempel2000, author = {Dudek, Mariusz and Rudnicki, Andrzej and Hempel, Lorenz}, title = {Zum Zusammenhang zwischen strukturellen und funktionellen Parametern eines Verkehrsnetzes}, doi = {10.25643/bauhaus-universitaet.598}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5985}, year = {2000}, abstract = {Im Vortrag wird der Frage nachgegangen, inwieweit zwischen den strukturellen Parametern Dispersion eines Verkehrsnetzes bzw. der Kennziffer der Unterentwicklung eines Verkehrsnetzes und den mittleren Fahrzeiten bzgl. unterschiedlicher Verkehrsbedarfsmatrizen ein Zusammenhang besteht. An Hand von 10 verschiedenen Ring-Radius-Strukturen f{\"u}r den MIV (Motorisierter Individual-Verkehr) und 3 verschiedenen Ring-Radius-Strukturen f{\"u}r den Busverkehr wird bei 5 unterschiedlichen O-D-Bedarfsmatrizen der Nachweiß eines solchen Zusammenhanges gef{\"u}hrt. Die Ergebnisse erlauben es, auf Grund struktureller Analysen Aussagen {\"u}ber funktionelle Bewertungen des Verkehrsnetzes zu treffen. Da strukturelle Bewertungen mit wesentlich geringerem Aufwand an Input-Daten und an Rechenzeit als funktionelle Bewertungen bestimmbar sind, bringt dies deutliche Einsparungen in der Planungsphase von Verkehrsnetzen mit sich.}, subject = {Verkehrsplanung}, language = {de} } @article{Dzwigon1997, author = {Dzwigon, Wieslaw}, title = {Sch{\"a}tzung der Verkehrs-Verteilung (O-D Matrix) bei der Anwendung der Verkehrsst{\"a}rkemessung in den Straßenquerschnitten}, doi = {10.25643/bauhaus-universitaet.464}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4647}, year = {1997}, abstract = {O-D Matrix sind die wichtigste Informationsquelle, die den Bedarf an Transport in der Stadt betrifft. Sie dienen den richtigen Bildung von Straßennetz und {\"O}ffentlichen Personen Verkehrslinien. Anhand diesen Grundlagen gerechnet man Verkehrsst{\"a}rken, die zur Dimensionierung der Verkehrsinfrastruktur benutzt werden. Im Verkehrsplannung zur Rechnung O-D Matrix wird Vier - Stufen - Methode angewendet. In dieser Methode verwendet man die Angaben aus den Haushaltsumfragen und aus den Kordonumfragen. Diese Methode fordert einen großen Arbeitsaufwand und Kosten. Hier wird die andere Methode dargestellt. Bei Sch{\"a}tzung der O-D Matrix verwendet man die Verkehrsst{\"a}rken, die in den Straßenquerschnitten gemessen werden. Wir brauchen gemessene Verkehrsst{\"a}rken auch f{\"u}r andere Ziele (z. B. f{\"u}r Signalsteuerung, f{\"u}r Beobachtung des Motorisierungstrendes). Darum ist diese Methode billiger als das traditionelle Verfahren. In diesen Methode haben wir zwei M{\"o}glichkeiten. Die erste - von Verkehrsst{\"a}rkemessungen kann man O-D Matrix direkt sch{\"a}tzen. Und zweite M{\"o}glichkeit - zuerst rechnen wir die Verkehrserzeugungen und sp{\"a}ter O-D Matrix. Das zweite Verfahren hat einen wesentlichen Vorteil und zwar, anhand der Verkehrserzeugungen ist es m{\"o}glich alle Elemente O-D Matrix zu rechnen. Bei der Sch{\"a}tzung der O-D Matrix unmittelbar von den Messungen (das erste Verfahren) bekommt man nur diese Elemente, die in den beobachtenen Straßenquerschnitten auftreten.}, subject = {Stadtverkehr}, language = {de} } @inproceedings{Dzwigon2003, author = {Dzwigon, Wieslaw}, title = {Qualit{\"a}t im {\"O}PNV - die Erh{\"o}hung und das Erhalten der Frequenz}, doi = {10.25643/bauhaus-universitaet.296}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2968}, year = {2003}, abstract = {Um die entsprechende Qualit{\"a}t der {\"O}PNV zu erreichen, sollte man das Verh{\"a}ltnis zwischen der Bedienungsqualit{\"a}t und dem Kostenaufwand analysieren. In den Bedingungen der anwachsenden Konkurenz aus der Seite der PKW und anderen Fuhrunternehmern soll man die Handlungen, die gr{\"o}sste Effektivit{\"a}t gew{\"a}hrleisten, aufnehmen. Es gibt viele M{\"o}glichkeiten die diese Qualit{\"a}t verbessern k{\"o}nnen, wie z.B. steigernde Frequenz der Fahrzeuge, Vergr{\"o}ßerung der Geschwindigkeit, P{\"u}nktlichkeit und Regelm{\"a}ßigkeit, Einf{\"u}hrung der Niederfußfahrzeuge und vieles mehr. Ich versuche in meinem Referat die Aspekte zu analysieren, die mit der Frequenz verbunden sind, d.h. die Erh{\"o}hung der Frequenz und das Erhalten der konstanten H{\"a}ufigkeit der Linienbusse. Das Referat umfasst die Modelle und die Beispiele. In Verbindung mit den Untersuchungen, die die Bereitschaft der Bezahlung f{\"u}r die Verbesserung der Qualit{\"a}t betreffen, kann man schon Entscheidungen treffen, die unterschiedlichen Standard der Fahrt bestimmen.}, subject = {{\"O}ffentlicher Personennahverkehr}, language = {de} } @inproceedings{EbertBucher2000, author = {Ebert, Matthias and Bucher, Christian}, title = {Modelling of changing of dynamic and static parameters of damaged R/C}, doi = {10.25643/bauhaus-universitaet.582}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5825}, year = {2000}, abstract = {Dynamic testing for damage assessment as non-destructive method has attracted growing in-terest for systematic inspections and maintenance of civil engineering structures. In this con-text the paper presents the Stochastic Finite Element (SFE) Modeling of the static and dy-namic results of own four point bending experiments with R/C beams. The beams are dam-aged by an increasing load. Between the load levels the dynamic properties are determined. Calculated stiffness loss factors for the displacements and the natural frequencies show differ-ent histories. A FE Model for the beams is developed with a discrete crack formulation. Cor-related random fields are used for structural parameters stiffness and tension strength. The idea is to simulate different crack evolutions. The beams have the same design parameters, but because of the stochastic material properties their undamaged state isn't yet the same. As the structure is loaded a stochastic first crack occurs on the weakest place of the structure. The further crack evolution is also stochastic. These is a great advantage compared with de-terministic formulations. To reduce the computational effort of the Monte Carlo simulation of this nonlinear problem the Latin-Hypercube sampling technique is applied. From the results functions of mean value and standard deviation of displacements and frequencies are calcu-lated. Compared with the experimental results some qualitative phenomena are good de-scribed by the model. Differences occurs especially in the dynamic behavior of the higher load levels. Aim of the investigations is to assess the possibilities of dynamic testing under consideration of effects from stochastic material properties}, subject = {Stahlbetonbauteil}, language = {en} } @article{ElRayesHyari2004, author = {El-Rayes, Khaled and Hyari, Khalied}, title = {A Multi-objective Model for Optimizing Construction Planning of Repetitive Infrastructure Projects}, doi = {10.25643/bauhaus-universitaet.213}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2135}, year = {2004}, abstract = {This paper presents the development of a model for optimizing resource utilization in repetitive infrastructure projects. The model provides the capability of simultaneous minimization of both project duration and work interruptions for construction crews. The model provides in a single run, a set of nondominated solutions that represent the tradeoff between these two objectives. The model incorporates a multiobjective genetic algorithm and scheduling algorithm. The model initially generates a randomly selected set of solutions that evolves to a near optimal set of tradeoff solutions in subsequent generations. Each solution represents a unique scheduling solution that is associated with certain project duration and a number of interruption days for utilized construction crews. As such, the model provides project planners with alternative schedules along with their expected duration and resource utilization efficiency.}, subject = {Mehragentensystem}, language = {en} } @inproceedings{ElRayesKandil2004, author = {El-Rayes, Khaled and Kandil, Amr}, title = {Distributed Computing for the Optimization of Large-Scale Construction Projects}, doi = {10.25643/bauhaus-universitaet.160}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1601}, year = {2004}, abstract = {Available construction time-cost trade-off analysis models can be used to generate trade-offs between these two important objectives, however, their application is limited in large-scale construction projects due to their impractical computational requirements. This paper presents the development of a scalable and multi-objective genetic algorithm that provides the capability of simultaneously optimizing construction time and cost large-scale construction projects. The genetic algorithm was implemented in a distributed computing environment that utilizes a recent standard for parallel and distributed programming called the message passing interface (MPI). The performance of the model is evaluated using a set of measures of performance and the results demonstrate the capability of the present model in significantly reducing the computational time required to optimize large-scale construction projects.}, subject = {Baubetrieb}, language = {en} } @article{EmelichevGirlichPodkopaev1997, author = {Emelichev, V. A. and Girlich, E. and Podkopaev, D. P.}, title = {Several kinds of Stability of efficient Solutions in Vector Trajectorial discrete Optimization Problem}, doi = {10.25643/bauhaus-universitaet.503}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-5030}, year = {1997}, abstract = {This work was partially supported by DAAD, Fundamental Researches Foundation of Belarus and International Soros Science Education Program We consider a vector discrete optimization problem on a system of non- empty subsets (trajectories) of a finite set. The vector criterion of the pro- blem consists partial criterias of the kinds MINSUM, MINMAX and MIN- MIN. The stability of eficient (Pareto optimal, Slater optimal and Smale op- timal) trajectories to perturbations of vector criterion parameters has been investigated. Suficient and necessary conditions of eficient trajectories local stability have been obtained. Lower evaluations of eficient trajectories sta- bility radii, and formulas in several cases, have been found for the case when l(inf) -norm is defined in the space of vector criterion parameters.}, subject = {Diskrete Optimierung}, language = {en} } @article{Erlemann2004, author = {Erlemann, Kai}, title = {BABSIM - An object-oriented software framework for microscopic simulation of freeway traffic}, doi = {10.25643/bauhaus-universitaet.260}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2601}, year = {2004}, abstract = {A wide variety of behavioural models exist in microscopic traffic simulation. Commercial programms often use closed-source policies and are confined to their respective simulation platforms. Open-source approaches mainly focus on distinctive, highly specialized traffic situations. In the scope of this paper, an open-source framework for developing modular, objectoriented simulation systems is presented, capable of simultaneously accommodating different driving models and enabling the user to modify and extend the catalogue of driving behaviours. The existing driving behaviours and the computational implementation of the simulation are being described.}, subject = {Framework }, language = {en} } @inproceedings{EslimyIsfahanyPegels2004, author = {Eslimy-Isfahany, S. H. R. and Pegels, Georg}, title = {Net-distributed Co-operation Including Developing Countries, Practical Case Study - Iran}, doi = {10.25643/bauhaus-universitaet.142}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1421}, year = {2004}, abstract = {The scientific transfer of key technology features to developing countries, together with adequate competence, localisation and adaptation, is the primary purpose of the proposed investigation. It is evident that introducing high-level CAD design and detailing will improve the planning process in developing countries. Successful utilization of applied information technology for the planning process, however, depends on the user-interface of individual software. Therefore, to open the great opportunity embedded in CAD software for clients globally, the language and character-set barrier of traditional user-interfaces must be overcome. A proposal for a research program is given here to address such issue in favour of global civil engineering.}, subject = {Ingenieurbau}, language = {en} } @inproceedings{FahrigNachtweyGellert2004, author = {Fahrig, Torsten and Nachtwey, Bj{\"o}rn and Gellert, Sebastian}, title = {A Product Model based Approach to Interactive CAE Design Optimization}, doi = {10.25643/bauhaus-universitaet.190}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1901}, year = {2004}, abstract = {We present a software prototype for fluid flow problems in civil engineering, which combines essential features of Computational Steering approaches with efficient methods for model transfer and high performance computing. The main components of the system are described: - The modeler with a focus on the data management of the product model - The pre-processing and the post-processing toolkit - The simulation kernel based on the Lattice Boltzmann method - The required hardware for real-time computing}, subject = {Produktmodell}, language = {en} } @inproceedings{FediorHamel, author = {Fedior, Marco and Hamel, Wido}, title = {Simulationsumgebung zur Evaluation von umweltorientierten Verkehrsmanagement-Strategien}, series = {30. Forum Bauinformatik}, booktitle = {30. Forum Bauinformatik}, editor = {Steiner, Maria and Theiler, Michael and Mirboland, Mahsa}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3867}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20190328-38678}, pages = {6}, abstract = {Der vorliegende Beitrag beschreibt die Problematik bei der Prognose verkehrsbedingter Schadstoff-Immissionen. Im Mittelpunkt steht die Entwicklung und der Aufbau einer Simulationsumgebung zur Evaluation von umweltorientierten Verkehrsmanagement-Strategien. Die Simulationsumgebung wird {\"u}ber die drei Felder Verkehr, Emission, Immission entwickelt und findet zun{\"a}chst Anwendung in der Evaluation verkehrlicher Maßnahmen f{\"u}r die Friedberger Landstraße in Frankfurt am Main.}, subject = {Verkehr}, language = {de} } @article{Fink2004, author = {Fink, Thomas}, title = {Structural analysis, design and detailing using standard CAD software and standard building information model}, doi = {10.25643/bauhaus-universitaet.270}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2702}, year = {2004}, abstract = {This paper describes the concept of a german commercial software package developed for the needs of structural engineers. Using a standard CAD software as user interface for all geometrical data and to save all important input data, there is a natural link to upcoming building information models.}, subject = {Bauindustrie}, language = {en} } @article{Firmenich2004, author = {Firmenich, Berthold}, title = {Product Models in Network Based Co-operation in Structural Engineering}, doi = {10.25643/bauhaus-universitaet.211}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2119}, year = {2004}, abstract = {The Priority Programme 'Network Based Co-operation in Structural Engineering' of the 'German Research Foundation' (DFG) has been established in the year 2000. This paper describes and discusses the main research directions and first results of the workgroup 'Distributed Product Models'. The five projects of the workgroup have developed completely different solutions for specific application domains. Each solution concept deals with a consistent product modeling and knowledge processing in a distributed environment in the planning process. The individual solution approaches of the projects are described and the underlying basic assumptions are discussed. A unified system architecture is described for all projects of the workgroup. Two different approaches (object-oriented and graph-based models) have been introduced for product and knowledge modeling. The common structure of these models will be explained to fully understand the differences of these modeling approaches. Finally the concepts for co-operative work and conflict management in a distributed environment are described: The solution approaches will be distinguished by classifying the supported co-operation according to time. A final scientific summary describes the state-of-the-art in network based co-operation in structural engineering: The role of research directions like knowledge modeling, standard product modeling and versioning in the distributed planning process will be explained.}, subject = {Produktmodell}, language = {en} } @article{FischerSteinhage1997, author = {Fischer, A. and Steinhage, V.}, title = {Ein modellbasiertes Konzept zur st{\"a}dteplanerischen Kartierung durch digitale Bildanalyse}, doi = {10.25643/bauhaus-universitaet.487}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4870}, year = {1997}, abstract = {There is an increasing need for 3D building extraction from aerial images for various applications such astown planning, environmental- and property-related studies. Aerial images usually reveal on one hand a certain amount of information not relevant for the given task of building extraction like vegetation, cars etc. On the other hand there is a loss of relevant information due to occlusions, low contrasts or disadvantageous perspectives. Therefore a promising concept for automated building reconstruction must incorporate a suffciantly complete model of the objects of interest. We propose a model-based approach to 3D building extraction from aerial images which reveals a tight coupling between a generic 3D object model and an explicit 2D image model. The generic object model employes domain specific volumetric primitives (i. e. building part models) and combination schemes. To cover the gap between 3D object models and 2D image data the image model is employed to predict the projective building appearences in aerial images. We present a strategy for a model-based building extraction based on the recognition-by-components principle and show first experimental results derived from international test sets}, subject = {Stadtplanung}, language = {de} } @inproceedings{FlemmingSnyder1997, author = {Flemming, Ulrich and Snyder, J.}, title = {Building and Databases: the SEED Experience}, doi = {10.25643/bauhaus-universitaet.415}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4151}, year = {1997}, abstract = {We describe the database requirements of SEED (Software Environment to Support the Early Phases in Building Design). The requirements are typical for a database that intends to support a heterogeneous design support environment consisting of independent software modules with diverse internal design models, requirements not met by any commercial database system. The design and implementation of this database is an integral part of the overall software engineering effort. We describe the SEED approach that integrates external and in-house software based on a shared information model specified in the modeling language SPROUT, which allows for the specification of domains, and classes, relationship types and their behavior, and multiple classifications. The SPROUT run-time system organizes and coordinates the communication between the software modules and the database}, subject = {Bauentwurf}, language = {en} } @inproceedings{FloodIssaAbuShdid2004, author = {Flood, Ian and Issa, Raja and Abu-Shdid, Caesar}, title = {Developments in Hyper Real-Time Simulation of Transient Heat-Flow in Buildings}, doi = {10.25643/bauhaus-universitaet.196}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1961}, year = {2004}, abstract = {This paper reports on the latest results in the development of a new approach for simulating the thermal behavior of buildings that overcomes the limitations of conventional heat-transfer simulation methods such as FDM and FEM. The proposed technique uses a coarse-grain approach to model development whereby each element represents a complete building component such as a wall, internal space, or floor. The thermal behavior of each coarse-grain element is captured using empirical modeling techniques such as artificial neural networks (ANNs). The main advantages of the approach compared to conventional simulation methods are: (a) simplified model construction for the end-user; (b) simplified model reconfiguration; (c) significantly faster simulation runs (orders of magnitude faster for two and three-dimensional models); and (d) potentially more accurate results. The paper demonstrates the viability of the approach through a number of experiments with a model of a composite wall. The approach is shown to be able to sustain highly accurate longterm simulation runs, if the coarse-grain modeling elements are implemented as ANNs. In contrast, an implementation of the coarse-grain elements using a linear model is shown to function inaccurately and erratically. The paper concludes with an identification of on-going work and future areas for development of the technique.}, subject = {Hochschulbildung}, language = {en} } @inproceedings{Fojud2003, author = {Fojud, Artur}, title = {Investment strategies over full cycle of life of a flexible pavement}, doi = {10.25643/bauhaus-universitaet.314}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-3146}, year = {2003}, abstract = {The pavement is one of the basic components of road infrastructure and, therefore, directly influences general levels of transport safety, as well as the quality of transportation services in human and cargo traffic. It also exerts a major influence on the final logistic costs of production and services in many aspects of everyday life. The continuity of transportation, which is closely tied to the development of a number of areas in the economy of every State, depends on the technical condition of the road pavement. Making proper investments in the complete course of life of the road pavement, a policy which makes sure that the conditions for continuous, safe, efficient, and economically optimised transportation are satisfied, is a priority for every administration managing municipal funds. If investments in the road pavement are not carried out properly, there usually are more and more road pavements the condition of which causes delays in transportation, and directly compromises traffic safety. Such a situation increases the running costs of vehicles, and decreases the transportation service levels and comfort of travelling. At the moment, the majority of pavements in Europe, (nearly 90\% of all pavements) are flexible road pavements. Due to the prevalent number of flexible pavements in Europe, the author analyses investment in the course of full-time of life cycle of the pavements, with a stress on flexible pavements. The paper presents basic assumptions and definitions in the area of analysis of life cycle costs of a flexible road pavement, as well as profits associated with proper long range investment. The classification of damages to flexible road pavement has also been presented, and their influence on technical and use related assessment of road pavement conditions, basing on the traditional road pavement structures, with relation to the catalogue of typical flexible pavements used in Poland, as well as regarding French, British, and American experience in constructing long life road pavements. The second part of the paper discusses different investment strategies in the course of a full-time of life cycle of the road pavement, and proposes a procedure of evaluating investment strategies. The summary presents some assumptions for a global index of investment evaluation during the full-time of life cycle of a pavement, based on the Best Return Index (BRI).}, subject = {Straßenbau}, language = {en} } @article{FoorgberMueller1997, author = {Foorgber, U. and M{\"u}ller, Christian}, title = {A Planning Process Model for Computer Supported Cooperative Work in Building Construction}, doi = {10.25643/bauhaus-universitaet.492}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4922}, year = {1997}, abstract = {Increasing complexity of today's buildings requires a high level of integration in the planning process. Common planning strategies, where individual project partners cooperate mainly to exchange results, are not suitable to jointly develop project goals and objectives. Integrated planning, a more holistic approach to deal with complex problems, is based on a high degree of communication amoung team members and leads to a goal oriented cooperation. Current approaches in the reasearch area of Computer Supported Cooperative Work (CSCW) poorly meet the requirements in planning. A planning process model, based on the principles of integrated planning will be introduced, aimed to provide the background for the implementation of a CSCW-platform.}, subject = {Bauwesen}, language = {en} } @inproceedings{Freundt2003, author = {Freundt, Martin}, title = {Fuzzy Logik und Graphentheorie als Basis einer flexiblen Bauablaufplanung}, doi = {10.25643/bauhaus-universitaet.287}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2878}, year = {2003}, abstract = {Der Bauablauf unterliegt vielen Unw{\"a}gbarkeiten. Von besonderer Bedeutung ist dieses Problem im Umfeld der Revitalisierung von Bauwerken. In weiten Teilen sind die auszuf{\"u}hrenden Arbeiten nur schwer im Vorfeld planbar. Die Ursachen hierf{\"u}r liegen großteils in der Problematik des Bauens im Bestand und dem aus wirtschaftlichen Gr{\"u}nden geringen Umfang von Analysen. H{\"a}ufig treten verdeckte, im Vorfeld der Baumaßnahme nicht erkannte Sch{\"a}den auf oder Materialstrukturen und Bauteilqualit{\"a}ten wurden in der Planung unzureichend ber{\"u}cksichtigt. Alte Ausf{\"u}hrungsunterlagen sind oft nicht verf{\"u}gbar. Viele zur Ausf{\"u}hrung bestimmter Arbeiten n{\"o}tige Informationen fehlen und werden erst zum unmittelbaren Ausf{\"u}hrungszeitpunkt bekannt. Einzelne Arbeiten sind nur schwer kalkulierbar bzw. planbar. Sie sind in Art und Umfang zun{\"a}chst nicht bekannt und m{\"u}ssen gegebenenfalls als neue Vorg{\"a}nge im Plan ber{\"u}cksichtigt werden. Diese besondere Situation bedarf einer gezielten Ber{\"u}cksichtigung. Die Planung des Bauablaufes muss in einer flexiblen und leicht anpassbaren Art und Weise erfolgen. Im folgenden Beitrag wird ein Ansatz zur Entwicklung eines solchen Prozessmodells vorgestellt, der im Rahmen des SFB 524 >Werkstoffe und Konstruktionen f{\"u}r die Revitalisierung von Bauwerken< an der Bauhaus-Universit{\"a}t Weimar untersucht und vorangetrieben wurde und wird. Das vorgestellte Modell kann kurzfristig flexibel auf die realen Gegebenheiten reagieren und erm{\"o}glicht trotzdem eine Planung und Steuerung des gesamten Ablaufs. Es enth{\"a}lt nicht wie bisher {\"u}blich deterministische Daten in starren Anordnungsbeziehungen. Vielmehr werden die Daten der Prozesse und die Beziehungen der Prozesse untereinander in einer nichtdeterministischen, unscharfen Form modelliert....}, subject = {Bauablauf / Ablaufplanung}, language = {de} } @inproceedings{FreundtBeucke2004, author = {Freundt, Martin and Beucke, Karl}, title = {A flexible model for scheduling building processes based on graph theory and fuzzy numbers}, doi = {10.25643/bauhaus-universitaet.158}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1587}, year = {2004}, abstract = {The methods currently used for scheduling building processes have some major advantages as well as disadvantages. The main advantages are the arrangement of the tasks of a project in a clear, easily readable form and the calculation of valuable information like critical paths. The main disadvantage on the other hand is the inflexibility of the model caused by the modeling paradigms. Small changes of the modeled information strongly influence the whole model and lead to the need to change many more details in the plan. In this article an approach is introduced allowing the creation of more flexible schedules. It aims towards a more robust model that lowers the need to change more than a few information while being able to calculate the important propositions of the known models and leading to further valuable conclusions.}, subject = {Baubetrieb}, language = {en} } @inproceedings{FruchterChao2004, author = {Fruchter, Renate and Chao, Yunn Chyi}, title = {AEC Global Teamwork: Emergent Work Processes}, doi = {10.25643/bauhaus-universitaet.191}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1912}, year = {2004}, abstract = {This ethnographic study reports on emerging work processes and practices observed in the AEC (Architecture/Engineering/Construction) Global Teamwork program, i.e., what people experience when interacting with and through collaboration technologies, why people practice in the way they do, how the practice fits into the environment and changes the work patterns. It presents the experience of two high-performance typical but extreme AEC teamwork cases adopting and adapting to collaboration technologies and how these technologies in practice impact their work processes. The findings illustrate the importance of collaboration technologies in cross-disciplinary, global teamwork. Observations indicate that high performance teams that use the collaboration technologies effectively exhibit collaboration readiness at an early stage and manage to define a "third way" to meet the demands of the cross-disciplinary, multi cultural and geographically distributed AEC workspace. The observations and implications represent the blueprint for yearly innovations and improvements to the design of the AEC Global Teamwork program.}, subject = {Hochschulbildung}, language = {en} }