@inproceedings{GruendelLudwigGeisenhansluekeetal., author = {Gr{\"u}ndel, Hendrik and Ludwig, Horst-Michael and Geisenhansl{\"u}ke, Carsten and M{\"u}ller, Matthias}, title = {Einfluss der Zusammensetzung von Portlandzementklinker und Sulfattr{\"a}ger auf das Erstarrungsverhalten von Spritzbeton}, series = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung : 16.-18. September 2015, Weimar}, booktitle = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung : 16.-18. September 2015, Weimar}, isbn = {978-3-00-050225-5 (Bauhaus-Universit{\"a}tsverlag Weimar)}, doi = {10.25643/bauhaus-universitaet.4885}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20240507-48851}, pages = {549-555}, abstract = {In der vorliegenden Studie wurde der Einfluss der Klinkerzusammensetzung sowie der Sulfattr{\"a}gerart auf die Leistungsf{\"a}higkeit eines Spritzzementes untersucht. Um eine Untersulfatisierung im System mit einen Aluminiumsulfat / -hydroxid Beschleuniger zu vermeiden, sollte ein anhydritbasierter Sulfattr{\"a}ger eingesetzt werden. Dies f{\"u}hrt zu einer besseren Festigkeitsentwicklung im jungen Alter.}, subject = {Beton}, language = {de} } @inproceedings{MuellerLudwigSchulteSchreppingetal., author = {Mueller, Matthias and Ludwig, Horst-Michael and Schulte-Schrepping, Christoph and Breitenb{\"u}cher, Rolf}, title = {Dauerhafte Betonfahrbahndecken durch Verwendung unterschiedlicher Bindemittel in Ober- und Unterbeton}, series = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung, 16. - 18.09.2015, Weimar. Band 2}, booktitle = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung, 16. - 18.09.2015, Weimar. Band 2}, editor = {Ludwig, Horst-Michael}, organization = {F.A.Finger-Institut f{\"u}r Baustoffkunde, Bauhaus-Universit{\"a}t Weimar}, isbn = {978-3-00-050225-5 (Bauhaus-Universit{\"a}tsverlag Weimar)}, doi = {10.25643/bauhaus-universitaet.4871}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20240507-48711}, pages = {2536-2543}, abstract = {Gem{\"a}ß dem Regelwerk f{\"u}r Betonstraßen muss f{\"u}r zweischichtige Betonfahrbahndecken derselbe Zement in Ober- und Unterbeton verwendet werden. Weiterhin ist die Anrechnung von Flugasche auf den w/z-Wert nicht gestattet. Durch eine flexiblere Handhabung der Bindemittel k{\"o}nnten sich Vorteile f{\"u}r die Betonbauweise ergeben. So k{\"o}nnte z.B. der st{\"a}rker durch Frost beanspruchte Oberbeton mit CEM I hergestellt werden, w{\"a}hrend Zemente mit h{\"o}heren H{\"u}ttensandgehalten nur im Unterbeton angewendet werden. Im Unterbeton k{\"o}nnten dann Gesteinsk{\"o}rnungen eingesetzt werden, die in einer herk{\"o}mmlichen CEM I-Rezeptur als AKR-kritisch eingestuft w{\"u}rden. Anhand von AKR-Performance-Pr{\"u}fungen konnte die hohe Wirksamkeit h{\"u}ttensandhaltiger Zemente sowie auch von Flugasche auf die AKR-Verminderung aufgezeigt werden. Schon mit einem CEM II/B-S wurden AKR-kritische Rezepturen in den unkritischen Bereich verschoben. Der Frost-Tausalz-Widerstand der Betone wurde bei hohen Gehalten an H{\"u}ttensand bzw. H{\"u}ttensand + Flugasche verringert, bewegte sich aber in jedem Fall noch im g{\"u}nstigen Bereich. Um eine Beeintr{\"a}chtigung der baupraktischen Umsetzbarkeit zu vermeiden, sollte sich die Festigkeitsentwicklung von Ober- und Unterbeton im jungen Alter nicht zu stark unterscheiden. Modellberechnungen zur Festlegung einer Mindestfestigkeit f{\"u}r die fr{\"u}he Belastung sind derzeit noch in Bearbeitung.}, subject = {Beton}, language = {de} } @inproceedings{MuellerLudwigBenHahaetal., author = {M{\"u}ller, Matthias and Ludwig, Horst-Michael and Ben Haha, Mohsen and Zajac, Maciej}, title = {Optimization of multi-component cements containing clinker, slag, V-fly ash, limestone}, series = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung, 16. - 18.09.2015, Weimar. Band 2}, booktitle = {Tagungsband 19. Ibausil - 19. Internationale Baustofftagung, 16. - 18.09.2015, Weimar. Band 2}, editor = {Ludwig, Horst-Michael}, organization = {F.A.Finger-Institut f{\"u}r Baustoffkunde, Bauhaus-Universit{\"a}t Weimar}, isbn = {978-3-00-050225-5 (Bauhaus-Universit{\"a}tsverlag Weimar)}, doi = {10.25643/bauhaus-universitaet.4870}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20240507-48700}, pages = {424-431}, abstract = {The aim of this study was to investigate the optimization of the strength development of quaternary cements with 50 \% clinker by a variation of the particle size distribution of the components GGBFS, fly ash and limestone powder. By balancing the overall PSD of the cement by using unprocessed fly ash and coarse limestone powder in combination with a very fine GGBFS, the water demand of the resulting quaternary cements remained unaltered, while the compressive strength of the cements was increased significantly after 7d, 28 and 56d. As can be expected, the quaternary cement with 30 wt.\% of the fine slag exhibited a stronger strength increase (about 18 \% after 28 d) than the cements with only 20 wt.\% slag (about 10\% after 28d).}, subject = {Zement}, language = {en} } @inproceedings{MartinezSotoJentsch, author = {Martinez Soto, Aner and Jentsch, Mark F.}, title = {Quantifizierung der langfristigen Entwicklung des Nutzungsgrades von Anlagen und Ger{\"a}ten im Wohnungssektor in Deutschland und Bestimmung zuk{\"u}nftiger Energieeinsparpotenziale im Hinblick auf die Klimaschutzziele der Bundesregierung}, series = {Bauphysiktage Kaiserslautern 2015, Kaiserslautern, 21-22 Oktober 2015}, booktitle = {Bauphysiktage Kaiserslautern 2015, Kaiserslautern, 21-22 Oktober 2015}, editor = {Kornadt, Oliver}, edition = {Zweitver{\"o}ffentlichung}, publisher = {Eigenverlag der Technischen Universit{\"a}t Kaiserslautern}, address = {Kaiserslautern}, doi = {10.25643/bauhaus-universitaet.3106}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170516-31067}, pages = {137-141}, abstract = {Etwa ein Viertel des gesamten Endenergieverbrauchs (26\%) in Deutschland entf{\"a}llt auf den Wohnungssektor, wodurch dieser Sektor einen erheblichen Anteil am m{\"o}glichen Einsparpotenzial an Energie hat. Im Hinblick auf das Klimaschutzziel der Europ{\"a}ischen Union, die Energieeffizienz im Vergleich zu 1990 um 20\% zu erh{\"o}hen, stellt sich daher die Frage, welche Einsparpotenziale es im Wohnungssektor tats{\"a}chlich gibt und wie diese quantifiziert werden k{\"o}nnen. In dieser Arbeit wird der Einfluss der Parameter, die den Endenergieverbrauch beeinflussen, mit Hilfe einer Sensitivit{\"a}tsanalyse bestimmt. Die Ergebnisse der Sensitivit{\"a}tsanalyse zeigen, dass die einflussreichsten Parameter auf den Endenergieverbrauch der Innentemperaturbedarf, die L{\"a}nge der Heizperiode, die Außentemperatur (Gradtagzahl) und die Anzahl der Wohnungen sind. Dies sind Variablen, die nicht durch Verordnungen reguliert werden k{\"o}nnen. Der einzige Parameter, der regulierbar ist und einen bedeutenden Einfluss auf den Endenergieverbrauch hat, ist der Nutzungsgrad der Anlagen/Ger{\"a}te f{\"u}r Raumw{\"a}rme, Warmwasser und Kochen (sowie zu einem geringen Teil der Wirkungsgrad der eingesetzten Beleuchtung). Zur Quantifizierung des Energieeinsparpotentials im deutschen Wohnungssektor bez{\"u}glich des Nutzungsgrades wurden in dieser Arbeit Daten zur Bestimmung der langfristigen Entwicklung (Zeitraum 1990-2010) des Nutzungsgrades von Anlagen und Ger{\"a}ten analysiert. Mit verschiedenen Angaben aus der Literatur und mit Hilfe von S{\"a}ttigungskurven wurde die Entwicklung der Nutzugsgrade der Anlagen/Ger{\"a}te entsprechend der Energiequellen zwischen 1990 und 2010 ermittelt. Die erhaltenden S{\"a}ttigungskurven erm{\"o}glichen die Bestimmung der Entwicklung des Nutzenergieverbrauchs im deutschen Wohnungssektor. Hierbei wurde festgestellt, dass die Differenz zwischen Nutzenergieverbrauch und Endenergieverbrauch einen R{\"u}ckgang von 12 \% im betrachtenden Zeitraum verzeichnete und dass das Energieeinsparpotenzial in Abh{\"a}ngigkeit von der Energiequelle betr{\"a}chtlich variieren kann (um derzeit mehr als 35\%-Punkte). Im Hinblick auf das oben genannte Klimaschutzziel werden in dieser Arbeit verschiedene Entwicklungsszenarien auf Basis des Nutzungsgrades der Anlagen und der Energiequellen analysiert. Hierbei wird deutlich, dass das theoretische Energieeinsparpotenzial im deutschen Wohnungssektor bez{\"u}glich des durchschnittlichen Nutzungsgrades nur zwischen 4 und 15 \% liegt. Dies bedeutet, dass eine deutliche Reduktion des Endenergiebedarfs im Wohnungssektor nur stattfinden kann, wenn andere Energieeinsparmaßnahmen betrachtet werden. Basierend auf den Ergebnissen der Sensitivit{\"a}tsanalyse werden hierzu Empfehlungen gegeben.}, subject = {Wohnung}, language = {de} } @inproceedings{Jentsch, author = {Jentsch, Mark F.}, title = {Entwicklung eines Sommerreferenzjahres zur Bestimmung der sommerlichen {\"U}berhitzung von Geb{\"a}uden}, series = {Bauphysiktage Kaiserslautern 2015, Kaiserslautern, 21-22 Oktober 2015}, booktitle = {Bauphysiktage Kaiserslautern 2015, Kaiserslautern, 21-22 Oktober 2015}, editor = {Kornadt, Oliver}, publisher = {Eigenverlag der Technischen Universit{\"a}t Kaiserslautern}, address = {Kaiserslautern}, doi = {10.25643/bauhaus-universitaet.3105}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170516-31058}, pages = {53-61}, abstract = {Die Ableitung von sommer-fokussierten warmen Referenzjahren aus langj{\"a}hrigen Klimadaten erfolgt in Europa bisher nach unterschiedlichen, l{\"a}nderspezifischen Methoden, die sich in der Regel allein auf die Trockentemperatur beziehen und in der Auswahl eines zusammenh{\"a}ngenden realen Sommerhalbjahres resultieren. Simulationsergebnisse zur sommerlichen {\"U}berhitzung von nat{\"u}rlich bel{\"u}fteten Geb{\"a}uden in Deutschland und Großbritannien zeigen jedoch f{\"u}r einige Wetterstationen weniger {\"U}berhitzung f{\"u}r Simulationen mit dem sommer-fokussierten Referenzjahr als f{\"u}r solche mit dem entsprechenden Testreferenzjahr (TRY) f{\"u}r den gleichen Ort. Dies gilt insbesondere dann, wenn einzelne Monate miteinander verglichen werden. Neben der Wahl eines kompletten Halbjahres, das sowohl extrem warme als auch vergleichsweise k{\"u}hle Monate beinhalten kann, liegt dies vor allem begr{\"u}ndet in der fehlenden Ber{\"u}cksichtigung der Solarstrahlung bei der Auswahl eines warmen Referenzjahres, die jedoch eine wichtige Rolle f{\"u}r sommerliche {\"U}berhitzungserscheinungen in Geb{\"a}uden spielt. Eine verl{\"a}ssliche, allgemein anerkannte Methode zur Erstellung von sommer-fokussierten Referenzjahren erscheint daher auch im Hinblick auf die rechtlichen Rahmenbedingungen in der Europ{\"a}ischen Union, die Strategien zur nat{\"u}rlichen Bel{\"u}ftung von Neubauten und Sanierungen beg{\"u}nstigen, erforderlich. Diese Arbeit pr{\"a}sentiert einen Ansatz zur Erstellung eines Sommerreferenzjahres (Summer Reference Year - SRY) aus dem TRY eines gegebenen Ortes und langj{\"a}hrigen Klimadaten. Die existierenden TRY-Daten werden hierbei skaliert, um den Bedingungen f{\"u}r Trockentemperatur und Solarstrahlung von nah-extremen Kandidatenjahren zu entsprechen, die separat {\"u}ber einen statistischen Ansatz ausgew{\"a}hlt werden. Anschließend werden Feuchttemperatur, Windgeschwindigkeit und Luftdruck des TRY durch lineare Korrelationen mit der Trockentemperatur angepasst, um die entsprechenden SRY-Daten zu erhalten. Der Vorteil dieser Methode liegt darin, dass das grundlegende Wettermuster des TRY erhalten bleibt und somit eine klare Relation zwischen SRY und TRY besteht, die eine Vergleichbarkeit von Simulationsergebnissen gew{\"a}hrleistet. {\"U}ber vergleichende Geb{\"a}udesimulationen mit dem zugrundeliegenden TRY und langj{\"a}hrigen Klimadatens{\"a}tzen kann nachgewiesen werden, dass sich das SRY zur Ermittlung sommerlicher {\"U}berhitzungserscheinungen in nat{\"u}rlich bel{\"u}fteten Geb{\"a}uden eignet. Weiterhin kann gezeigt werden, dass das SRY im Gegensatz zur direkten Nutzung eines Kandidatenjahres f{\"u}r einen nah-extremen Sommer die M{\"o}glichkeit eines monatsscharfen Vergleichs mit dem TRY erlaubt und frei von wenig repr{\"a}sentativen Besonderheiten ist, die in den entsprechenden Kandidatenjahren vorhanden sein k{\"o}nnen.}, subject = {Bauphysik}, language = {de} } @inproceedings{WiggenbrockSmarsly, author = {Wiggenbrock, Jens and Smarsly, Kay}, title = {A GENERIC FRAMEWORK SUPPORTING DISTRIBUTED COMPUTING IN ENGINEERING APPLICATIONS}, 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.2826}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28260}, pages = {9}, abstract = {Modern distributed engineering applications are based on complex systems consisting of various subsystems that are connected through the Internet. Communication and collaboration within an entire system requires reliable and efficient data exchange between the subsystems. Middleware developed within the web evolution during the past years provides reliable and efficient data exchange for web applications, which can be adopted for solving the data exchange problems in distributed engineering applications. This paper presents a generic approach for reliable and efficient data exchange between engineering devices using existing middleware known from web applications. Different existing middleware is examined with respect to the suitability in engineering applications. In this paper, a suitable middleware is shown and a prototype implementation simulating distributed wind farm control is presented and validated using several performance measurements.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{Vieira, author = {Vieira, Nelson}, title = {SOME RESULTS IN FRACTIONAL CLIFFORD ANALYSIS}, 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.2825}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28256}, pages = {6}, abstract = {What is nowadays called (classic) Clifford analysis consists in the establishment of a function theory for functions belonging to the kernel of the Dirac operator. While such functions can very well describe problems of a particle with internal SU(2)-symmetries, higher order symmetries are beyond this theory. Although many modifications (such as Yang-Mills theory) were suggested over the years they could not address the principal problem, the need of a n-fold factorization of the d'Alembert operator. In this paper we present the basic tools of a fractional function theory in higher dimensions, for the transport operator (alpha = 1/2 ), by means of a fractional correspondence to the Weyl relations via fractional Riemann-Liouville derivatives. A Fischer decomposition, fractional Euler and Gamma operators, monogenic projection, and basic fractional homogeneous powers are constructed.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{Vasileva, author = {Vasileva, Iuliia}, title = {THE PROBLEM OF PARTIAL REINFORCING AN INTERFACE CRACK EDGE BY A RIGID PATCH PLATE UNDER IN-PLANE AND ANTIPLANE LOADS}, 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.2824}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28242}, pages = {5}, abstract = {The stress state of a piecewise-homogeneous elastic body, which has a semi-infinite crack along the interface, under in-plane and antiplane loads is considered. One of the crack edges is reinforced by a rigid patch plate on a finite interval adjacent to the crack tip. The crack edges are loaded with specified stresses. The body is stretched at infinity by specified stresses. External forces with a given principal vector and moment act on the patch plate. The problem reduces to a Riemann-Hilbert boundary-value matrix problem with a piecewise-constant coefficient for two complex potentials in the plane case and for one in the antiplane case. The complex potentials are found explicitly using a Gaussian hypergeometric function. The stress state of the body close to the ends of the patch plate, one of which is also simultaneously the crack tip, is investigated. Stress intensity factors near the singular points are determined.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{SmarslyTauscher, author = {Smarsly, Kay and Tauscher, Eike}, title = {IFC-BASED MONITORING INFORMATION MODELING FOR DATA MANAGEMENT IN STRUCTURAL HEALTH MONITORING}, 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.2823}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28237}, pages = {7}, abstract = {This conceptual paper discusses opportunities and challenges towards the digital representation of structural health monitoring systems using the Industry Foundation Classes (IFC) standard. State-of-the-art sensor nodes, collecting structural and environmental data from civil infrastructure systems, are capable of processing and analyzing the data sets directly on-board the nodes. Structural health monitoring (SHM) based on sensor nodes that possess so called "on-chip intelligence" is, in this study, referred to as "intelligent SHM", and the infrastructure system being equipped with an intelligent SHM system is referred to as "intelligent infrastructure". Although intelligent SHM will continue to grow, it is not possible, on a well-defined formalism, to digitally represent information about sensors, about the overall SHM system, and about the monitoring strategies being implemented ("monitoring-related information"). Based on a review of available SHM regulations and guidelines as well as existing sensor models and sensor modeling languages, this conceptual paper investigates how to digitally represent monitoring-related information in a semantic model. With the Industry Foundation Classes, there exists an open standard for the digital representation of building information; however, it is not possible to represent monitoring-related information using the IFC object model. This paper proposes a conceptual approach for extending the current IFC object model in order to include monitoring-related information. Taking civil infrastructure systems as an illustrative example, it becomes possible to adequately represent, process, and exchange monitoring-related information throughout the whole life cycle of civil infrastructure systems, which is referred to as monitoring information modeling (MIM). However, since this paper is conceptual, additional research efforts are required to further investigate, implement, and validate the proposed concepts and methods.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{BargstaedtTarigan, author = {Bargst{\"a}dt, Hans-Joachim and Tarigan, Rina Sari}, title = {RULE BASED EXPANSION OF STANDARD CONSTRUCTION PROCESSES}, 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.2822}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28229}, pages = {6}, abstract = {The paper introduces a systematic construction management approach, supporting expansion of a specified construction process, both automatically and semi-automatically. Throughout the whole design process, many requirements must be taken into account in order to fulfil demands defined by clients. In implementing those demands into a design concept up to the execution plan, constraints such as site conditions, building code, and legal framework are to be considered. However, complete information, which is needed to make a sound decision, is not yet acquired in the early phase. Decisions are traditionally taken based on experience and assumptions. Due to a vast number of appropriate available solutions, particularly in building projects, it is necessary to make those decisions traceable. This is important in order to be able to reconstruct considerations and assumptions taken, should there be any changes in the future project's objectives. The research will be carried out by means of building information modelling, where rules deriving from standard logics of construction management knowledge will be applied. The knowledge comprises a comprehensive interaction amongst bidding process, cost-estimation, construction site preparation as well as specific project logistics - which are usually still separately considered. By means of these rules, favourable decision taking regarding prefabrication and in-situ implementation can be justified. Modifications depending on the available information within current design stage will consistently be traceable.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{TanLahmerSiddappa, author = {Tan, Fengjie and Lahmer, Tom and Siddappa, Manju Gyaraganahalll}, title = {SECTION OPTIMIZATION AND RELIABILITY ANALYSIS OF ARCH-TYPE DAMS INCLUDING COUPLED MECHANICAL-THERMAL AND HYDRAULIC FIELDS}, 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.2821}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28212}, pages = {8}, abstract = {From the design experiences of arch dams in the past, it has significant practical value to carry out the shape optimization of arch dams, which can fully make use of material characteristics and reduce the cost of constructions. Suitable variables need to be chosen to formulate the objective function, e.g. to minimize the total volume of the arch dam. Additionally a series of constraints are derived and a reasonable and convenient penalty function has been formed, which can easily enforce the characteristics of constraints and optimal design. For the optimization method, a Genetic Algorithm is adopted to perform a global search. Simultaneously, ANSYS is used to do the mechanical analysis under the coupling of thermal and hydraulic loads. One of the constraints of the newly designed dam is to fulfill requirements on the structural safety. Therefore, a reliability analysis is applied to offer a good decision supporting for matters concerning predictions of both safety and service life of the arch dam. By this, the key factors which would influence the stability and safety of arch dam significantly can be acquired, and supply a good way to take preventive measures to prolong ate the service life of an arch dam and enhances the safety of structure.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{StokmaierClassSchulenbergetal., author = {Stokmaier, Markus and Class, A.G. and Schulenberg, T. and Lahey Jr., R.T}, title = {OPTIMISING ACOUSTIC RESONATORS FOR SONOFUSION EXPERIMENTS WITH EVOLUTIONARY ALGORITHMS}, 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.2820}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28202}, pages = {8}, abstract = {The sizing of simple resonators like guitar strings or laser mirrors is directly connected to the wavelength and represents no complex optimisation problem. This is not the case with liquid-filled acoustic resonators of non-trivial geometries, where several masses and stiffnesses of the structure and the fluid have to fit together. This creates a scenario of many competing and interacting resonances varying in relative strength and frequency when design parameters change. Hence, the resonator design involves a parameter-tuning problem with many local optima. As its solution evolutionary algorithms (EA) coupled to a forced-harmonic FE simulation are presented. A new hybrid EA is proposed and compared to two state-of-theart EAs based on selected test problems. The motivating background is the search for better resonators suitable for sonofusion experiments where extreme states of matter are sought in collapsing cavitation bubbles.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{Rodrigues, author = {Rodrigues, M. Manuela}, title = {OPERATIONAL PROPERTIES OF THE LAGUERRE TRANSFORM}, 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.2818}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28186}, pages = {5}, abstract = {The Laguerre polynomials appear naturally in many branches of pure and applied mathematics and mathematical physics. Debnath introduced the Laguerre transform and derived some of its properties. He also discussed the applications in study of heat conduction and to the oscillations of a very long and heavy chain with variable tension. An explicit boundedness for some class of Laguerre integral transforms will be present.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{Rodehorst, author = {Rodehorst, Volker}, title = {EVALUATION OF THE METRIC TRIFOCAL TENSOR FOR RELATIVE THREE-VIEW ORIENTATION}, 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.2817}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28178}, pages = {7}, abstract = {In photogrammetry and computer vision the trifocal tensor is used to describe the geometric relation between projections of points in three views. In this paper we analyze the stability and accuracy of the metric trifocal tensor for calibrated cameras. Since a minimal parameterization of the metric trifocal tensor is challenging, the additional constraints of the interior orientation are applied to the well-known projective 6-point and 7-point algorithms for three images. The experimental results show that the linear 7-point algorithm fails for some noise-free degenerated cases, whereas the minimal 6-point algorithm seems to be competitive even with realistic noise.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{NguyenTuanLahmerDatchevaetal., author = {Nguyen-Tuan, Long and Lahmer, Tom and Datcheva, Maria and Stoimenova, Eugenia and Schanz, Tom}, title = {PARAMETER IDENTIFICATION APPLYING IN COMPLEX THERMO-HYDRO-MECHANICAL PROBLEMS LIKE THE DESIGN OF BUFFER ELEMENTS}, 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.2816}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28162}, pages = {6}, abstract = {This study contributes to the identification of coupled THM constitutive model parameters via back analysis against information-rich experiments. A sampling based back analysis approach is proposed comprising both the model parameter identification and the assessment of the reliability of identified model parameters. The results obtained in the context of buffer elements indicate that sensitive parameter estimates generally obey the normal distribution. According to the sensitivity of the parameters and the probability distribution of the samples we can provide confidence intervals for the estimated parameters and thus allow a qualitative estimation on the identified parameters which are in future work used as inputs for prognosis computations of buffer elements. These elements play e.g. an important role in the design of nuclear waste repositories.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{NasirBargstaedt, author = {Nasir, A.R. and Bargst{\"a}dt, Hans-Joachim}, title = {AMELIORATING EMPLOYABILITY IN CONSTRUCTION THROUGH BIM INNOVATION}, 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.2815}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28157}, pages = {6}, abstract = {Low-skilled labor makes a significant part of the construction sector, performing daily production tasks that do not require specific technical knowledge or confirmed skills. Today, construction market demands increasing skill levels. Many jobs that were once considered to be undertaken by low or un-skilled labor, now demand some kind of formal skills. The jobs that require low skilled labor are continually decreasing due to technological advancement and globalization. Jobs that previously required little or no training now require skilful people to perform the tasks appropriately. The study aims at ameliorating employability of less skilled manpower by finding ways to instruct them for performing constructions tasks. A review of exiting task instruction methodologies in construction and the underlying gaps within them warrants an appropriate way to train and instruct low skilled workers for the tasks in construction. The idea is to ensure the required quality of construction with technological and didactic aids seeming particularly purposeful to prepare potential workers for the tasks in construction without exposing them to existing communication barriers. A BIM based technology is considered promising along with the integration of visual directives/animations to elaborate the construction tasks scheduled to be carried on site.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{Musial, author = {Musial, Michal}, title = {THE INFLUENCE OF CRACKS AND OVERESTIMATION ERRORS ON THE DEFLECTION OF THE REINFORCED CONCRETE BEAMS IN THE RIGID FINITE ELEMENT METHOD}, 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.2814}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28142}, pages = {6}, abstract = {This article presents the Rigid Finite Element Method in the calculation of reinforced concrete beam deflection with cracks. Initially, this method was used in the shipbuilding industry. Later, it was adapted in the homogeneous calculations of the bar structures. In this method, rigid mass discs serve as an element model. In the flat layout, three generalized coordinates (two translational and one rotational) correspond to each disc. These discs are connected by elastic ties. The genuine idea is to take into account a discrete crack in the Rigid Finite Element Method. It consists in the suitable reduction of the rigidity in rotational ties located in the spots, where cracks occurred. The susceptibility of this tie results from the flexural deformability of the element and the occurrence of the crack. As part of the numerical analyses, the influence of cracks on the total deflection of beams was determined. Furthermore, the results of the calculations were compared to the results of the experiment. Overestimations of the calculated deflections against the measured deflections were found. The article specifies the size of the overestimation and describes its causes.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{MeierSchanz, author = {Meier, J{\"o}rg and Schanz, Tom}, title = {Benchmarking of Optimization Algorithms}, 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.2813}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28134}, pages = {6}, abstract = {In this paper, we present an empirical approach for objective and quantitative benchmarking of optimization algorithms with respect to characteristics induced by the forward calculation. Due to the professional background of the authors, this benchmarking strategy is illustrated on a selection of search methods in regard to expected characteristics of geotechnical parameter back calculation problems. Starting from brief introduction into the approach employed, a strategy for optimization algorithm benchmarking is introduced. The benchmarking utilizes statistical tests carried out on well-known test functions superposed with perturbations, both chosen to mimic objective function topologies found for geotechnical objective function topologies. Here, the moved axis parallel hyper-ellipsoid test function and the generalized Ackley test function in conjunction with an adjustable quantity of objective function topology roughness and fraction of failing forward calculations is analyzed. In total, results for 5 optimization algorithms are presented, compared and discussed.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{MacedoBentaPicadoSantos, author = {Macedo, Joaquim Miguel and Benta, Agostinho and Picado-Santos, Luis}, title = {USE OF MICROSIMULATION IN THE ADAPTATION TO PORTUGAL OF THE HCM 2000 METHODOLOGY FOR BASIC FREEWAY SEGMENTS}, 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.2812}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28122}, pages = {7}, abstract = {Portugal is one of the European countries with higher spatial and population freeway network coverage. The sharp growth of this network in the last years instigates the use of methods of analysis and the evaluation of their quality of service in terms of the traffic performance, typically performed through internationally accepted methodologies, namely that presented in the Highway Capacity Manual (HCM). Lately, the use of microscopic traffic simulation models has been increasingly widespread. These models simulate the individual movement of the vehicles, allowing to perform traffic analysis. The main target of this study was to verify the possibility of using microsimulation as an auxiliary tool in the adaptation of the methodology by HCM 2000 to Portugal. For this purpose, were used the microscopic simulators AIMSUN and VISSIM for the simulation of the traffic circulation in the A5 Portuguese freeway. The results allowed the analysis of the influence of the main geometric and traffic factors involved in the methodology by HCM 2000. In conclusion, the study presents the main advantages and limitations of the microsimulators AIMSUN and VISSIM in modelling the traffic circulation in Portuguese freeways. The main limitation is that these microsimulators are not able to simulate explicitly some of the factors considered in the HCM 2000 methodology, which invalidates their direct use as a tool in the quantification of those effects and, consequently, makes the direct adaptation of this methodology to Portugal impracticable.}, subject = {Angewandte Informatik}, language = {en} } @inproceedings{LopesRodriguesVilaReal, author = {Lopes, Nuno and Rodrigues, Daniela and Vila Real, Paulo}, title = {ANALYSIS OF STEEL STRUCTURAL MEMBERS IN FIRE WITH SLENDER CROSS-SECTIONS THROUGH BEAM FINITE ELEMENTS APPLYING AN EFFECTIVE CONSTITUTIVE LAW}, 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.2811}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170314-28116}, pages = {6}, abstract = {Steel profiles with slender cross-sections are characterized by their high susceptibility to instability phenomena, especially local buckling, which are intensified under fire conditions. This work presents a study on numerical modelling of the behaviour of steel structural elements in case of fire with slender cross-sections. To accurately carry out these analyses it is necessary to take into account those local instability modes, which normally is only possible with shell finite elements. However, aiming at the development of more expeditious methods, particularly important for analysing complete structures in case of fire, recent studies have proposed the use of beam finite elements considering the presence of local buckling through the implementation of a new effective steel constitutive law. The objective of this work is to develop a study to validate this methodology using the program SAFIR. Comparisons are made between the results obtained applying the referred new methodology and finite element analyses using shell elements. The studies were made to laterally restrained beams, unrestrained beams, axially compressed columns and columns subjected to bending plus compression.}, subject = {Angewandte Informatik}, language = {en} }