TY  - CHAP
A1  - Köppler, H.
A1  - Roos, Dirk
A1  - Burkhardt, Gerhard
T1  - Zur Berechnung vielschichtiger Schalen mit orthotropen Schichten
N2  - Wirklichkeitsnahe Erfassung und Beschreibung des Trag- und Verformungsverhaltens von Strukturen baulicher Anlagen hat in den letzten Jahrzehnten ständig an Bedeutung gewonnen. Konstruktionen im Hoch- und Industriebau werden zunehmend multifunktional genutzt - die >Grenzen< zwischen Bauwerk und Tragwerk, zwischen Hüll- und Tragkonstruktion lösen sich auf. Werden raumabschließende Elemente (Wände, Decken, Dächer) gleichzeitig als Tragelemente und wärme- und schalldämmende Konstruktionen ausgeführt, so entstehen beispielsweise Sandwichplatten, deren Schichten sehr stark differierende Materialeigenschaften aufweisen. Beim Aufbau des FEM-Modells für vielschichtige Schalen können die Formänderungshypothesen für jede Schicht einzeln als auch für die Schale insgesamt gegeben werden. Im ersten Fall ist der Knotenfreiheitsgrad von der Schichtenzahl abhängig, im zweiten Fall nicht. Im weiteren wird eine Formänderungshypothese für das Schichtenpaket angenommen. Ausgegangen wird von den Gleichungen der 3D-Elastizitätstheorie. Die Berücksichtigung der Querkraftschubverformungen ergibt die Möglichkeit einer adäquaten Beschreibung der Verformungen sowohl dünner Schalen als auch von Schalen mittlerer Dicke; die Berechnung der Krümmungen und der LAMEschen Parameter der Bezugsfläche zu umgehen, was für komplizierte Schalenformen eine selbständige Aufgabe ist; eines natürlichen Übergangs von homogenen zu geschichteten Schalen. Das vielschichtige isoparametrische Schalen-FE wird vorgestellt, seine Implementierung in das in Entwicklung befindliche Programmsystem SLANG wird vorbereitet.
KW  - Schale
KW  - Sandwichbauweise
KW  - Orthotropes Bauteil
KW  - Finite-Elemente-Methode
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4379
ER  - 
TY  - CHAP
A1  - König, Markus
A1  - Klinger, Axel
A1  - Berkhahn, Volker
T1  - Structural Correctness of Planning Processes in Building Engineering
N2  - The planning of projects in building engineering is a complex process which is characterized by a dynamical composition and many modifications during the definition and execution time of processes. For a computer-aided and network-based cooperation a formal description of the planning process is necessary. In the research project “Relational Process Modelling in Cooperative Building Planning” a process model is described by three parts: an organizational structure with participants, a building structure with states and a process structure with activities. This research project is part of the priority program 1103 “Network-Based Cooperative Planning Processes in Structural Engineering” promoted by the German Research Foundation (DFG). Planning processes in civil engineering can be described by workflow graphs. The process structure describes the logical planning process and can be formally defined by a bipartite graph. This structure consists of activities, transitions and relationships between activities and transitions. In order to minimize errors at execution time of a planning process a consistent and structurally correct process model must be guaranteed. This contribution considers the concept and the algorithms for checking the consistency and the correctness of the process structure.
KW  - Baubetrieb
KW  - Computerunterstütztes Verfahren
KW  - Planungsprozess
KW  - Konsistenz <Informatik>
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1690
ER  - 
TY  - CHAP
A1  - Müller, Karl-Heinz
A1  - Broßmann, Marko
T1  - Berücksichtigung des zeitlich zufälligen Lastverhaltens und zufälliger Systemeigenschaften bei der adaptiven Grenzlastanalyse
T1  - Adaptive Grenzlastanalyse von Stahlbetontragwerken mit stochastischem Strukturverhalten unter zeitlich zufälligen Lasten
N2  - Werden bei der Tragwerksauslegung Schnittgrößenumlagerungen infolge Plastizierungen zugelassen, dann ist die Lastintensität durch die Einhaltung von entsprechenden Grenzzustandskriterien, passend zum physikalisch nichtlinearen Tragverhalten, zu begrenzen. Für Tragwerke, die von mehreren unabhängig voneinander, wiederholt und in beliebiger Reihenfolge auftretenden Lasten beansprucht werden, stellt die adaptive Grenzlast (Einspiellast), ausgedrückt durch den adaptiven Grenzlastfaktor, ein geeignetes Grenzzustandskriterium dar. Bedingt durch zufällige Systemeigenschaften und zeitlich zufälliges Lastverhalten stellt der adaptive Grenzlastfaktor eine Zufallsgröße dar. Für die Bestimmung des stochastischen adaptiven Grenzlastfaktors und der Versagenswahrscheinlichkeit gegenüber dem Grenzzustand der Adaption für einen Zeitraum [0,T] werden die mathematische Optimierung (mechanische Problemlösung) und die Monte-Carlo-Simulation (stochastische Problemlösung) herangezogen, wobei eine Überführung von zeitvarianten Lastmodellen in äquivalente zeitinvariante Lastmodelle erforderlich wird. Am Beispiel eines eingespannten Stahlbetonrahmens wird untersucht, wie sich eine unterschiedliche stochastische Modellbildung des Tragwerks und eine unterschiedliche Vorgehensweise bei der Überlagerung von Extremwerten der Belastung auf die Beurteilung der Versagenswahrscheinlichkeit des Tragwerks für verschiedene Lebensdauern auswirken. Im Ergebnis dieser Untersuchungen zeigt sich, dass sich die Versagenswahrscheinlichkeit signifikant erhöht, wenn stochastische Tragwerkseigenschaften in Ansatz gebracht werden. Die größte Bedeutung besitzt dabei die Zufälligkeit der Zugfestigkeit der Bewehrung. Alle anderen Zufallsgrößen beeinflussen die Versagenswahrscheinlichkeit nur in ihrer Gesamtheit, einzeln betrachtet sind sie nahezu bedeutungslos. Es stellt sich weiterhin heraus, dass eine vereinfachte Überlagerung der Last-Extremwerte zu einer deutlichen Überschätzung der Versagenswahrscheinlichkeit führt und somit als konservatives Modell zu bewerten ist.
KW  - Tragwerk
KW  - Stahlbeton
KW  - Tragverhalten
KW  - Wahrscheinlichkeitsrechnung
KW  - Belastung
KW  - Zufallsvariable
Y1  - 2003
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3372
ER  - 
TY  - JOUR
A1  - Abdalla, Jamal
T1  - Elements of an Agent-based Mediative Communication Protocol for Design Objects
N2  - 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.
KW  - Mehragentensystem
KW  - Lernendes System
KW  - Kommunikationsprotokoll
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2207
ER  - 
TY  - JOUR
A1  - Gao, Zuoren
A1  - Wu, Weiyu
A1  - Ren, Aizhu
T1  - Physically Based Modeling and Multi-Physical Simulation System for Wood Structure Fire Performance
N2  - This research is devoted to promoting the performance-based engineering in wood structure fire. It looks into the characteristic of the material, structural composing and collapse detecting to find out the main factors in the wood structure collapse in fire. The aim of the research is to provide an automatic simulation platform for the complicated circulation. A physically based model for slim member for beams and columns and a frame of multi-physical simulation are provided to implement the system. The physically based model contains material model, structural mechanics model, material mechanics model, as well as geometry model for the compositive simulation. The multi-physical simulation is built on the model and has the capacity to carry out a simulation combining structural, fire (thermal, CFD) and material degradation simulation. The structural and fire simulation rely on two sophisticated software respectively, ANSYS (an FEA software) and FDS (with a core of CFD). Researchers of the paper develop system by themselves to combine the two existing ones. The system has the capability to calculate the wood char to find out the loss of cross-section and to detect the collapse caused in different ways. The paper gives a sample of Chinese traditional house to show how this simulation system works.
KW  - Produktmodell
KW  - Simulation
KW  - Bautechnik
KW  - Holzbau
KW  - Brandschutz
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2381
ER  - 
TY  - CHAP
A1  - Kamiñski, Mieczysław
A1  - Maj, Marek
A1  - Schmidt, Egon
T1  - Berechnungsmodell der Polystyrol-Massiv-Rippendecken
N2  - Neue Konstruktionsentwicklungen erwarten von Bauingenieuren auch neue Berechnungs- und Analysenmethoden. Zu solchen Konstruktionen gehören Polystyrol-Massiv-Rippendecken. Die Decken, die eine wichtige Rolle im Neubau sowie in der Sanierung und Rekonstruktion von Altbauten spielen, haben eine umfangreiche Technologiebeschreibung, jedoch relativ kleine Berechnungsbase zur statischen Analyse der Ausnutzugs- und Statischfestigkeitsparametern. In den Vortrag wurde eine Methode zu Analyse solche Decken dargestellt. Das interessante Problem befindet sich in der sogennaten zweiten Phase, wenn der Decke keine elastische Platte ist. Eine wichtige Rolle bei Berechnung spielen die veränderte Steifigkeit und Rheology.
KW  - Stahlbeton
KW  - Polystyrol
KW  - Rippendecke
Y1  - 2003
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3185
ER  - 
TY  - CHAP
A1  - Kohler, Niklaus
A1  - Bodin, Olivier
T1  - Dealing with sensitivity and uncertainty analysis in integrated buildung LCA model : Dealing with Uncertainty in Life Cyle Analysis of Building Model by Using Experiment Design Methods
N2  - Building design, realization, operation and refurbishment have to take into account the environmental impacts as well as the resulting costs over a long period of time. LCA methods had to be developed for buildings because of their complexity, their long life duration and through a large number of actors who are involved. This was realized by integrating life cycle analysis, life cycle costing and building product models in integrated LCA models. However the use of such models leads to difficulties. The principal ones are the uncertainty treatment in LCA models and the lack of experience of practitioners who are not LCA specialists. Answers to these problems are the management of uncertainty and the development of simplified models for building design, construction and operation. This can be achieved with the mean of experimental plans or Monte Carlo simulation. The paper will focus on how these techniques can be used, what are their possibilities and disadvantages, particularly concerning the development of simplified models.
KW  - Bauwerk
KW  - Mathematisches Modell
KW  - Lebensdauer
KW  - Unsicherheit
KW  - Monte-Carlo-Simulation
Y1  - 2003
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3220
ER  - 
TY  - CHAP
A1  - Mahdavi, A.
A1  - Mathew, P.
A1  - Hartkopf, V.
T1  - Real-time Coupling of Multi-Domain Representational and Analytical Building Object Models via Homology-based Mapping
N2  - Ideally, multiple computational building evaluation routines (particularly simulation tools) should be coupled in real-time to the representational design model to provide timely performance feed-back to the system user. In this paper we demonstrate how this can be achieved effectively and conveniently via homology-based mapping. We consider two models as homologous if they entail isomorphic topological information. If the general design representation (i.e., a shared object model) is generated in a manner so as to include both the topological building information and pointers to the semantic information base, it can be used to directly derive the domain representations (>enriched< object models with detailed configurational information and filtered semantic data) needed for evaluation purposes. As a proof of concept, we demonstrate a computational design environment that dynamically links an object-oriented space-based design model, with structurally homologous object models of various simulation routines.
KW  - Gebäude
KW  - Objektmodell
KW  - CAD
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4461
ER  - 
TY  - CHAP
A1  - Suzuki, Aketo
T1  - Numerical Analysis for Prediction as to Influence of Digging a Tunnel on Groundwater
N2  - This paper describes monitoring of the in-valley discharge and underground water level at the place where the tunnel will be constructed and also, the numerical analysis for prediction applying the Tank Model and Linear Filter Method to calculate the prediction. The application of these analyses has actually allowed the change of underground water level to be grasped and more effective information system to be established by comparing the real-time monitoring data with the real-time calculation of prediction.
KW  - Mobile Computing
KW  - Funknetz
KW  - Tunnelbau
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1133
ER  - 
TY  - CHAP
A1  - Xie, Haiyan
A1  - Issa, Raja
A1  - O'Brien, William
T1  - Structure of a Formal User Model for Construction Information Retrieval
N2  - Information science researchers and developers have spent many years addressing the problem of retrieving the exact information needed and using it for analysis purposes. In informationseeking dialogues, the user, i.e. construction project manager or supplier, often asks questions about specific aspects of the tasks they want to perform. But most of the time it is difficult for the software systems to unambiguously understand their overall intentions. The existence of information tunnels (Tannenbaum 2002) aggravates this phenomenon. This study includes a detailed case study of the material management process in the construction industry. Based on this case study, the structure of a formal user model for information retrieval in construction management is proposed. This prototype user model will be incorporated into the system design for construction information management and retrieval. This information retrieval system is a user-centered product based on the development of a user configurable visitor mechanism for managing and retrieving project information without worrying too much about the underlying data structure of the database system. An executable UML model combined with OODB is used to reduce the ambiguity in the user's intentions and to achieve user satisfaction.
KW  - Bauwerk
KW  - Datenmanagement
KW  - Benutzeroberfläche
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1296
ER  - 
TY  - JOUR
A1  - Takagi, Kousuke
A1  - Tani, Akinori
A1  - Kawamura, Hiroshi
T1  - Research on Intelligent Fuzzy Optimal Active and Hybrid Control Systems of Building Structures - Verification of Optimization Method on Switching Rules of Control Forces
N2  - Recently, many reseraches on active control systems of building structures are preformed based on modern control theory and are installed real buildings. The authors have already proposed intelligent fuzzy optimal active control (IFOAC) systems. IFOAC systems imitate intelligent activities of human brains such as prediction, adaptation, decision-kaking and so on. In IFOAC systems, objective and subjective judgements on the active control can be taken into account. However, IFOAC systems are considered to be suitable for far-field erathquake and control effect becomes small in case of near-field earthqaukes which include a few velosity pules with large amplitudes. To improve control effect in case of near-souece earthquakes, the authors have also proposed hybrid control (HC) systems, in which IFOAC systems and fuzzy control system are combined. In HC systems, the fuzzy control systems are introduced as a reflective fuzzy active control (RFAC) system and imitates spinal reflection of human. In HC systems, active control forces are activated to buildings in accordance with switching rules on active control forces. In this paper, optimizations on fuzzy control rules in RFAC system and switching rules of active control forces in HC system are performed by Parameter-Free Genetic Algorithms (PfGAs). Here, the optimization is performed by using different earthquake inputs. The results of digital simulations show that the HC system can reduce maximal response displacements under restrictions on strokes of the actuator effectively in case of a near-source earthquake and the effectiveness of the proposed HC system is discussed and clarified.
KW  - Mehragentensystem
KW  - Lernendes System
KW  - Fuzzy-Logik
KW  - Optimierung
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2238
ER  - 
TY  - JOUR
A1  - Willenbacher, Heiko
A1  - Hübler, Reinhard
T1  - Intelligent Link-Management for the Support of Integration in Building Life Cycle
N2  - The processes in the life cycle of buildings are characterised by highly distinct teamwork. The integration of all the distributed working participants, by providing an environment, which especially supports the communication and collaboration between the actors, is a fundamental step to improve the efficiency of the involved processes and to reduce the total costs. In this article, a link based modelling approach and its “intelligent” link management is introduced (1). This approach realises an integration environment based on a special building model that acts as a decision support system. The link-based modelling is characterised by the definition and specialisation of links between partial models. These intelligent managed links enable a very flexible and task specific data access and exchange between all the different views and partial models of the participants.
KW  - Mehragentensystem
KW  - Lernendes System
KW  - Bauwerk
KW  - Lebenszyklus
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2223
ER  - 
TY  - CHAP
A1  - Miles, John
A1  - Cen, Mei
A1  - Taylor, Mark
T1  - Linking Sketching and Constraint Checking for Early Conceptual Design
N2  - At the start of the conceptual design process, designers start to give tangible form to their thoughts by sketching. This helps with reasoning and communicates ideas to other members of the team. Sketches are gradually worked up into more formal drawings which are then passed to the other stages of the design process. There are however some problems with basing early ideas on sketching. For example, due to their ad-hoc nature, sketches tend only to be diagrammatic representations and so designers cannot be sure that their ideas are feasible and what is being proposed meets the constraints described in the client brief. This can result in designers wasting time working up ideas which prove to be unsuitable. Also the process of constraint checking is complex and time consuming and so designers tend limit their search of possible options and instead choose satisfying rather than good solutions. This paper describes the INTEGRA project which examines the role of sketching in early conceptual design and how this can be linked to other aspects of the process and particularly automated constraint checking using an IT based approach. The focus for the work is the design of framed buildings. A multi-disciplinary approach has been adopted and the work has been undertaken in close collaboration with practising designers and clients.
KW  - Konzipieren <Technik>
KW  - Bauwerk
KW  - Management
KW  - Constraintnetz
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1547
ER  - 
TY  - JOUR
A1  - Motawa, Ibrahim
A1  - Anumba, Chimay
A1  - El-Hamalawi, A.
T1  - Development of a Fuzzy System for Change Prediction in Construction Projects
N2  - Change management has been the focus of different IT systems. These IT systems were developed to represent design information, record design rationale, facilitate design coordination and changes. They are largely based on managing reactive changes, particularly design changes, in which changes are recorded and then propagated to the relevant project members. However, proactive changes are hardly dealt with in IT systems. Proactive changes require estimating the likelihood of occurrence of a change event as well as estimating the degree of change impacts on project parameters. Changes in construction projects often result from the uncertainty associated with the imprecise and vague knowledge of much project information at the early stages of projects. This is a major outcome of the case studies carried out as part of this research. Therefore, the proposed model considers that incomplete knowledge and certain project characteristics are always behind change causes. For proactive changes, predicting a change event is the main task for modelling. The prediction model should strive to integrate these main elements: 1) project characteristics that lead to change 2) causes of change, 3) the likelihood of change occurrence, and 4) the change consequences. It should also define the dependency relationships between these elements. However, limited data (documented) are only available from previous projects for change cases and many of the above elements can only be expressed in linguistic terms. This means that the model will simulate the uncertainty and subjectivity associated with these sets of elements. Therefore, a fuzzy model is proposed in this research to capture these elements. The model analyses the impact of each set of elements on the other by assigning fuzzy values for these elements that express the uncertainty and subjectivity of their impact. The main aim is to predict change events and evaluate change effects on project parameters. The fuzzy model described above was developed in an IT system for operational purposes and was designed as a Java package of components with their supporting classes, beans, and files. This paper describes the development and the architecture of the proposed IT system to achieve these requirements. The system is intended to help project teams in dealing with change causes and then the change consequences in construction projects.
KW  - Mehragentensystem
KW  - Lernendes System
KW  - Fuzzy-Logik
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2180
ER  - 
TY  - JOUR
A1  - Foorgber, U.
A1  - Müller, Christian
T1  - A Planning Process Model for Computer Supported Cooperative Work in Building Construction
N2  - 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.
KW  - Bauwesen
KW  - Integrierte Planung
KW  - Computer Supported Cooperative Work
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4922
ER  - 
TY  - CHAP
A1  - Miles, John
A1  - Joita, Liviu
A1  - Burnap, Peter
T1  - Collaborative Engineering: Virtual Teams in a Grid Environment Supporting Consortia in the Construction Industry
N2  - In the AEC (Architecture / Engineering / Construction) industry a number of individuals and organisations collaborate and work jointly on a construction project. The resulting consortium has large pool of expertise and experience and can be defined as a Virtual Organisation (VO) formed for the duration of the project. VOs are electronically networked organisations where IT and web based communication technology play an important role in coordinating various activities of these organisations. This paper describes the design, development and implementation of a Grid enabled application called the Product Supplier Catalogue Database (PSCD) which supports collaborative working in consortia. As part of the Grid-enabling process, specialised metadata is being developed to enable PSCD to effectively utilise Grid middleware such as Globus and Java CoG toolkits. We also describe our experience whilst designing, developing and deploying the security service of the application using the Globus Security Interface (GSI).
KW  - Ingenieurbau
KW  - Verteiltes System
KW  - Planungsprozess
KW  - Modellierung
KW  - Projektmanagement
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1362
ER  - 
TY  - CHAP
A1  - Palm, Johan
T1  - Integrated Engineering Workflow focused on the Structural Engineering in the Industrial Environment
N2  - The engineering and construction industry has been slow to exploit the full potential of information technology. The industry is highly fragmented, price sensitive, risk-adverse, and profit margins are small. Each project is unique with a small amount of technological innovation opportunities to capitalise on from one project to the next. Technological innovations that have been taking place are just simulating the old traditional paper workflow. Engineering information in digital form is being conveyed using traditional paper representations, which have to be interpreted by humans before the information can be used in other applications, thereby creating ‘islands of information’. It can be seen that poorly implemented IT strategies are duplicating paperwork, rather than reducing or eliminating it (Crowley et al., 2000). This paper will introduce the Integrated Engineering Workflow (IEW) concept to re-organise a structural discipline working on multi-disciplinary projects so as to maximise the advantages offered by new information technology.
KW  - Baubetrieb
KW  - Computerunterstütztes Verfahren
KW  - Prozessmanagement
KW  - Ingenieurbau
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1625
ER  - 
TY  - CHAP
A1  - Olivier, A. H.
T1  - An application-centred framework for distributed engineering applications
N2  - The conceptual structure of an application that can support the structural analysis task in a distributed collaboratory is described in (van Rooyen and Olivier 2004). The application described there has a standalone component for executing the finite element method on a local workstation in the absence of network access. This application is comparable to current, local workstation based finite element packages. However, it differs fundamentally from standard packages since the application itself, and its objects, are adapted to support distributed execution of the analysis task. Basic aspects of an object-oriented framework for the development of applications which can be used in similar distributed collaboratories are described in this paper. An important feature of this framework is its application-centred design. This means that an application can contain any number of engineering models, where the models are formed by the collection of objects according to semantic views within the application. This is achieved through very flexible classes Application and Model, which are described in detail. The advantages of the application-centred design approach is demonstrated with reference to the design of steel structures, where the finite element analysis model, member design model and connection design model interact to provide the required functionality.
KW  - Ingenieurbau
KW  - Verteiltes System
KW  - Planungsprozess
KW  - Modellierung
KW  - Framework <Informatik>
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1353
ER  - 
TY  - CHAP
A1  - Christov, Christo T.
A1  - Petrova, Lyllia B.
T1  - Computer-Aided Static Analysis of Complex Prismatic Orthotropic Shell Structures by the Analytical Finite Strip Method
N2  - 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.
KW  - Tragwerk
KW  - Schale
KW  - Orthotropes Bauteil
KW  - CAD
KW  - Finite-Streifen
Y1  - 1997
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4358
ER  - 
TY  - JOUR
A1  - Yabuki, Nobuyoshi
A1  - Yoshimura, Yutaka
T1  - An Evaluation System for Steel Structures of Hydroelectric Power Stations based on Fault Tree Analysis and Performance Maps
N2  - This paper presents an evaluation system for steel structures of hydroelectric power stations, including hydraulic gates and penstocks, based on Fault Tree Analyasis (FTA) and performance maps. This system consists of fault tree diagrams of FTA, performance maps, design and analysis systems, and engineerin databases. These four modules are integrated by appropriate hyperlinks so that the user of this system can use it easily and seamlessly. A well developed system was applied to some illustrative example cases, and they showed that the developed methodology and system worked well and the users found the system useful and effective for their maintenance tasks at powerstations.
KW  - Wissensmanagement
KW  - Stahlbau
KW  - Wasserkraftwerk
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2564
ER  -