@article{WagnerReuschelSchleicher, author = {Wagner, Ulrike and Reuschel, Elke and Schleicher, Wolfram}, title = {Das Schwingungsverhalten der Fußg{\"a}ngerbr{\"u}cke am Stern-Center in Potsdam}, series = {Stahlbau}, volume = {74}, journal = {Stahlbau}, number = {5}, publisher = {Wiley-Blackwell}, address = {Berlin}, issn = {1437-1049}, doi = {10.1002/stab.200590062}, pages = {331 -- 338}, abstract = {Die Fußg{\"a}ngerbr{\"u}cke am Stern-Center in Potsdam wurde vor sieben Jahren in Betrieb genommen. Seitdem werden sowohl von der Br{\"u}ckenverwaltung als auch von den Nutzern deutlich sp{\"u}rbare Schwingungen beim {\"u}berqueren der Br{\"u}cke festgestellt, die Anlaß zu Beunruhigungen geben. Ziel der durchgef{\"u}hrten Untersuchungen war es, das Schwingungsverhalten und die Schwingungsursachen der Schr{\"a}gseilbr{\"u}cke anhand von Messungen zu identifizieren und ein geeignetes FE-Rechenmodell zu entwickeln, das die dynamischen Wirkungen hinreichend genau erfaßt.}, subject = {Schwingungsverhalten}, language = {de} } @inproceedings{Kahlow, author = {Kahlow, Andreas}, title = {Johann August R{\"o}bling (1806-1869) — Early Projects in Context}, series = {John A. Roebling : A Bicentennial Celebration of His Birth 1806-2006}, booktitle = {John A. Roebling : A Bicentennial Celebration of His Birth 1806-2006}, organization = {American Society of Civil Engineers}, isbn = {9780784408995}, doi = {10.1061/40899(244)4}, pages = {26}, abstract = {Roebling became acquainted with Navier's theory at the Berlin Bauakademie in 1824/25. During his road planning work in Westphalia, he developed several suspension bridge projects in 1828. Roebling's travels along the Rhein and Ruhr in the winter of 1828 were connected with these projects. Roebling supplemented his notes on Dietlein's bridge-building lectures at the Berlin Bauakademie with excerpts from newer literature on suspension bridges. Under the title "Remarks on Bridge Construction" he discussed the results of his studies. Four known bridge projects can be distinguished. Two are only elaborated as an idea, in one case the project is only known by official letters. Only in the case of the Freienohl Bridge is there an exact description of the project. None of them have been brought to realization. Security considerations of the Berlin Oberbaudeputation probably led to the decision not to execute Roebling's Finnentrop project. This decision ought to be understood within the context of a bridge collapse in Nienburg /Saale in December 1825. When Roebling immigrated to the United States, he used his knowledge in construction methods and experiences with an experimental approach. For this reason, it is interesting to compare the early German projects with his first American bridges. While Roebling's first canal aqueducts combined suspension bridges with trusses, the Niagara Bridge marks a radical step forward to another dimension and to a new approach that emphasized thinking in terms of "systems". Interestingly, he also consistently maintained his construction principle for attaining stability by using rigid, wrapped main cables, inclined stays and wooden trusswork. Although he later used wrought iron profiles, he continued to use wooden constructions in his basic plans for a long time. There is no evidence that he made any contribution to the theories of trusses in a manner comparable with Whipple, Culmann, Gerber or others. Roebling's special talent lay in his constructive gifts.}, subject = {Projektmanagement}, language = {en} } @inproceedings{Lorenz, author = {Lorenz, R{\"u}diger}, title = {Development of new facades by combined modeling of thermal sounds and ventilation aspects at early design phases}, series = {Proceedings : Building Simulation 2007}, booktitle = {Proceedings : Building Simulation 2007}, organization = {International Building Performance Simulation Association (IBPSA)}, pages = {1395 -- 1402}, abstract = {Facades must meet with continuously increasing requirements concerning design quality and technical performance. It will be shown that neither extremely simplifying nor highly detailed simulation tools with complete geometrical representation really help to develop new facade types during the early stages of design. Due to simplified physical modelling, conceptual variations may not be adequately represented and this means that different properties cannot be seen. Detailed simulation programs provide proof - but in most cases only with regard to a single aspect of facade qualities - of whether a well defined set of parameters is already given and if an adequate representation is already integrated. This often prevents the perception of interdependencies and hinders the development of ideas. Based on the author's experience concerning simulation techniques and the process of facade consultancy services, a method with an adapted degree of abstraction was developed. Combined modelling of thermal, sound insulation and ventilation aspects during early design stages is described and a new multilayered facade is presented.}, subject = {Optimierung}, language = {en} } @incollection{BerkesMichelOrtgiese2021, author = {Berkes, Christian and Michel, Antje and Ortgiese, Michael}, title = {Vom Spiel zum Lab zur App : {\"O}kosystementwicklung im Projekt MaaS L.A.B.S.}, series = {Making Connected Mobility Work}, booktitle = {Making Connected Mobility Work}, publisher = {Springer Gabler}, address = {Wiesbaden}, isbn = {978-3-658-32266-3}, doi = {10.1007/978-3-658-32266-3_18}, pages = {313 -- 328}, year = {2021}, abstract = {Der Beitrag untersucht Herausforderungen und L{\"o}sungsans{\"a}tze in der kooperativen Entwicklung von intermodalen Mobilit{\"a}tsangeboten ({\"O}PNV plus Sharing) in kleinen und mittleren Großst{\"a}dten am Beispiel Potsdams. Er zeigt Werkzeuge und Wege, unterschiedliche Akteur*innenperspektiven im Planungsprozess konstruktiv zusammenzuf{\"u}hren und Konzepte f{\"u}r Mobilit{\"a}tsangebote gesellschaftlich, gesch{\"a}ftlich und technologisch robust zu gestalten. Er betrachtet das BMBF-gef{\"o}rderte Projekt MaaS L.A.B.S., welches als Living Lab einen nutzer*innenzentrierten Ansatz verfolgt. Strukturell geht der Beitrag von drei Feldern der MaaS-{\"O}kosystementwicklung aus, zeigt zugeh{\"o}rige Methoden, analysiert deren spezifische Qualit{\"a}ten und skizziert {\"U}bertragbarkeiten. Die drei Felder sind: (1) eine Akteur*innenanalyse einhergehend mit dem Serious Gaming-Format „Your Private MaaS", (2) der Living Lab-Ansatz als zentraler Handlungsrahmen und (3) die iterative IT-Systembild- und Plattformentwicklung. Der Text versteht sich als methodische Gesamtschau auf ein komplexes inter- und transdisziplin{\"a}res Forschungs- und Entwicklungsprojekt. Er {\"u}berschreitet die Disziplingrenzen zwischen Informationswissenschaften, Mobilit{\"a}tsforschung, Transformationsdesign und Technologieentwicklung.}, subject = {Mobilit{\"a}t}, language = {de} } @article{LinkeBoernerRug, author = {Linke, Gunter and B{\"o}rner, Tommy and Rug, Wolfgang}, title = {Untersuchungen zum Verschiebungsmodul verzahnter Balken}, series = {Bauingenieur}, volume = {97}, journal = {Bauingenieur}, number = {6}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {0005-6650}, doi = {10.37544/0005-6650-2022-06-46}, pages = {186 -- 191}, abstract = {Vor der industriellen Produktion von Stahltr{\"a}gern und Brettschichtholz boten Zahnbalken eine M{\"o}glichkeit große Auflagerabst{\"a}nde im Hoch- und Br{\"u}ckenbau zu {\"u}berspannen. Verzahnte Balken sind aus heutiger Sicht als nachgiebig zusammengesetzte Biegetr{\"a}ger zu betrachten. Dabei wirken die handwerklich hergestellten Zahnverbindungen in gleicher Weise wie zum Beispiel D{\"u}bel besonderer Bauart. Der zur statischen Nachweisf{\"u}hrung ben{\"o}tigte Verschiebungsmodul ist in der aktuell g{\"u}ltigen Holzbau-Bemessungsnorm DIN EN 1995-1-1:2010 nicht ausgewiesen. Somit ist es zurzeit nur durch eine versuchstechnische Ermittlung des Verschiebungsmoduls f{\"u}r die jeweilige Zahngeometrie m{\"o}glich, statische Nachweise durchzuf{\"u}hren.}, subject = {Balken}, language = {de} } @article{LorencKurzSeidl, author = {Lorenc, Wojciech and Kurz, Wolfgang and Seidl, G{\"u}nter}, title = {Hybrid steel-concrete sections for bridges : definition and basis for design}, series = {Engineering Structures}, volume = {270}, journal = {Engineering Structures}, publisher = {Elsevier}, address = {Amsterdam}, issn = {1873-7323}, doi = {10.1016/j.engstruct.2022.114902}, abstract = {This paper introduces (both formally and technically) a new concept: a hybrid steel-concrete cross section. The definition is based on the shear force transmission mechanism and it assumes the existence of a new type of shear connections, i.e. composite dowels. The hybrid cross-section is a generalization of composite steel-and-reinforced concrete cross sections and it is defined by a new way of dimensioning for vertical shear. The hybrid cross section concept is based on a specific approach to the lever arm of internal forces and an assumption that the local shear transfer mechanism of composite dowels is different than in the case of classic welded studs. The concept makes it possible to show by design calculations that the shear force is transferred through jointly the concrete part and the steel part. It is worth emphasizing that the proposed concept is a response to the new opportunities provided to engineers by composite dowels and to the fact that the bridge structures designed nowadays are different from the ones designed previously. The concept enables the design of completely new types of composite steel-concrete beams. The presented theoretical analyses verified by means of FEM show how the change of the shear connection level influences the division of the shear force in the cross section. This is included in the design concept through the internal lever arm of the hybrid section. The proposed concept has been shown to be internally consistent and complete.}, subject = {Verbundbr{\"u}cke}, language = {en} } @inproceedings{ZanonRademacherSeidletal., author = {Zanon, Riccardo and Rademacher, Dennis and Seidl, G{\"u}nter and Pak, Daniel}, title = {Integral VFT-RS composite bridges : efficient standard highway overpasses}, series = {IABSE Symposium Prague 2022 : Challenges for Existing and Oncoming Structures}, booktitle = {IABSE Symposium Prague 2022 : Challenges for Existing and Oncoming Structures}, address = {Z{\"u}rich}, organization = {International Association for Bridge and Structural Engineering (IABSE)}, isbn = {978-3-85748-183-3}, doi = {10.2749/prague.2022.1013}, pages = {1013 -- 1020}, abstract = {Starting from Germany, the VFT® bridge girder technology (prefabricated composite beam) has spread in several European countries in the last decades as further development of the standard steel-concrete composite solution. Its configuration fits perfectly to integral frame bridges built over existing infrastructure with the scope to minimize the traffic disturbance. In this paper a further development with the focus on cost efficiency in span ranges of 40-55 m is proposed: the VFT-RS technology. The change consists in using standard rolled sections by adapting them into the integral frame bridge configuration, further enhancing the structural efficiency with the benefits of high- steel strength. The constructive details to achieve the polygonal form have been studied to allow easy fabrication and a maximal clearance height over highway traffic lanes. The VFT-RS solution is conceived as the economic option of standard highway overpasses, with the aim of an overall construction cost reduction of 5\%.}, subject = {Verbundbr{\"u}cke}, language = {en} } @article{LorencSeidlBerthellemy, author = {Lorenc, Wojciech and Seidl, G{\"u}nter and Berthellemy, Jacques}, title = {The evolution of the shape of composite dowels}, series = {Studia geotechnica et mechanica}, volume = {44}, journal = {Studia geotechnica et mechanica}, number = {4}, address = {Wrocław}, organization = {Wrocław University of Science and Technology}, issn = {2083-831X}, doi = {10.2478/sgem-2022-0021}, pages = {296 -- 316}, abstract = {Composite dowels have opened new possibilities for engineers designing composite structures. The fundamental and most important characteristic of composite dowels is the shape of the cutting line. It is important to understand why only one particular shape of the cutting line is used in bridge engineering, while so many different shapes have been investigated by many researchers. The essential part of the process of developing composite dowels - the development of the shape of the cutting line - is presented in this paper. The influence of the steel web thickness is presented, and technological problems of steel fabrication are highlighted. The role of empirical experience from the first bridges, push-out tests, and finite element simulations is presented. Assumptions for numerical procedures are given. The distinction between the steel failure and concrete failure modes is introduced for composite dowels. The paper presents how the concept of "shape" was divided into "shape," "ratio," and finally "size," and how, because of the fatigue problems in bridges, all the three factors have emerged to result in the form of shapes that can satisfy the requirements for bridges. Research leading to the invention of the first version of the clothoidal shape is presented.}, subject = {Verbundd{\"u}bel}, language = {en} } @article{LinkeLuebkenPfriemetal., author = {Linke, Gunter and L{\"u}bken, Vera and Pfriem, Alexander and Rug, Wolfgang and Weiß, Markus}, title = {Bestand statt Austausch - Untersuchungen zum Trag- und Verformungsverhalten von historischen Brettschichtholzbauteilen}, series = {Bauingenieur}, volume = {98}, journal = {Bauingenieur}, number = {1-2}, publisher = {VDI Fachmedien}, address = {D{\"u}sseldorf}, issn = {0005-6650}, doi = {10.37544/0005-6650-2023-01-02-29}, pages = {1 -- 9}, abstract = {Die Erfindung des Brettschichtholzes durch Otto Hetzer kann zu Recht als Geburtsstunde des Ingenieurholzbaus betrachtet werden. Die Herstellung zusammengesetzter und mittels Leim verbundener Bretter erm{\"o}glichte die Herstellung von weitgespannten Holztragwerken bis zu Spannweiten von 40 m. Dadurch wurde der Holzbau wieder konkurrenzf{\"a}hig gegen{\"u}ber dem Stahl- und Massivbau. Auch heutzutage existieren noch zahlreiche originalgetreu erhaltene Konstruktionen in Hetzer-Bauweise. Im Sanierungsfall ist eine Einsch{\"a}tzung der Tragf{\"a}higkeit erforderlich. Erkenntnisse hierzu k{\"o}nnen durch Versuche an historischen Bauteilen und Konstruktionen gewonnen werden. Der vorliegende Beitrag beschreibt derartige Untersuchungen zum Trag- und Verformungsverhalten am Beispiel von historischen Brettschichtholztr{\"a}gern von 1912, die bis 2017 Teil der Dachkonstruktion eines Schulgeb{\"a}udes waren. Die Ergebnisse zeigen, dass die historischen Brettschichtholzbauteile auch nach mehr als 100 Jahren Standzeit mit modernem Brettschichtholz vergleichbar sind.}, subject = {Material}, language = {de} } @article{ZanonRademacherSeidletal., author = {Zanon, Riccardo and Rademacher, Dennis and Seidl, G{\"u}nter and Pak, Daniel}, title = {Integral bridge with RS-Overpass technology : step into the future of standard highway overpasses}, series = {ce/papers}, volume = {6}, journal = {ce/papers}, number = {1}, publisher = {Ernst \& Sohn}, address = {Berlin}, issn = {2509-7075}, doi = {10.1002/cepa.1928}, pages = {459 -- 470}, abstract = {Starting from Germany, the VFT bridge girder technology (prefabricated composite beam) has spread in several European countries in the last decades as further development of the standard steel-concrete composite solution. Its configuration fits perfectly to integral frame bridges built over existing infrastructure with the scope to minimize the traffic disturbance. In this paper a further development with the focus on cost efficiency in span ranges of 40-55 m is proposed: the RS-Overpass technology. The change consists in using standard rolled sections by adapting them into the integral frame bridge configuration, further enhancing the structural efficiency with the benefits of high-steel strength. The constructive details to achieve the polygonal form have been studied to allow easy fabrication and a maximal clearance height over highway traffic lanes. The RS-Overpass solution is conceived as the economic option of standard highway overpasses, with the aim of a overall construction cost reduction of 5\%. The possibility of weathering steel or hot-dip galvanization create the unique offer for a maintenance-free solution.}, subject = {Verbundbr{\"u}cke}, language = {en} }