TY - JOUR A1 - Wagner, Ulrike A1 - Reuschel, Elke A1 - Schleicher, Wolfram T1 - Das Schwingungsverhalten der Fußgängerbrücke am Stern-Center in Potsdam JF - Stahlbau N2 - Die Fußgängerbrücke am Stern-Center in Potsdam wurde vor sieben Jahren in Betrieb genommen. Seitdem werden sowohl von der Brückenverwaltung als auch von den Nutzern deutlich spürbare Schwingungen beim überqueren der Brücke festgestellt, die Anlaß zu Beunruhigungen geben. Ziel der durchgeführten Untersuchungen war es, das Schwingungsverhalten und die Schwingungsursachen der Schrägseilbrücke anhand von Messungen zu identifizieren und ein geeignetes FE-Rechenmodell zu entwickeln, das die dynamischen Wirkungen hinreichend genau erfaßt. KW - Schwingungsverhalten KW - Fußgängerbrücke KW - Potsdam KW - Schrägseilbrücke KW - Frequenzanalyse Y1 - 2006 U6 - https://doi.org/10.1002/stab.200590062 SN - 1437-1049 VL - 74 IS - 5 SP - 331 EP - 338 PB - Wiley-Blackwell CY - Berlin ER - TY - CHAP A1 - Kahlow, Andreas T1 - Johann August Röbling (1806-1869) — Early Projects in Context T2 - John A. Roebling : A Bicentennial Celebration of His Birth 1806-2006 N2 - 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. KW - Projektmanagement KW - Infrastrukturplanung KW - Brücke KW - Methodisches Konstruieren KW - Hängebrücke KW - Kabel KW - Querträger KW - USA KW - Deutschland Y1 - 2006 SN - 9780784408995 U6 - https://doi.org/10.1061/40899(244)4 ER - TY - CHAP A1 - Lorenz, Rüdiger T1 - Development of new facades by combined modeling of thermal sounds and ventilation aspects at early design phases T2 - Proceedings : Building Simulation 2007 N2 - 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. KW - Optimierung KW - Schalldämmung KW - Belüftung KW - Doppelte Fassade Y1 - 2007 UR - http://www.ibpsa.org/proceedings/BS2007/p781_final.pdf SP - 1395 EP - 1402 ER - TY - CHAP A1 - Berkes, Christian A1 - Michel, Antje A1 - Ortgiese, Michael T1 - Vom Spiel zum Lab zur App : Ökosystementwicklung im Projekt MaaS L.A.B.S. T2 - Making Connected Mobility Work N2 - Der Beitrag untersucht Herausforderungen und Lösungsansätze in der kooperativen Entwicklung von intermodalen Mobilitätsangeboten (ÖPNV plus Sharing) in kleinen und mittleren Großstädten am Beispiel Potsdams. Er zeigt Werkzeuge und Wege, unterschiedliche Akteur*innenperspektiven im Planungsprozess konstruktiv zusammenzuführen und Konzepte für Mobilitätsangebote gesellschaftlich, geschäftlich und technologisch robust zu gestalten. Er betrachtet das BMBF-geförderte Projekt MaaS L.A.B.S., welches als Living Lab einen nutzer*innenzentrierten Ansatz verfolgt. Strukturell geht der Beitrag von drei Feldern der MaaS-Ökosystementwicklung aus, zeigt zugehörige Methoden, analysiert deren spezifische Qualitäten und skizziert Übertragbarkeiten. 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 transdisziplinäres Forschungs- und Entwicklungsprojekt. Er überschreitet die Disziplingrenzen zwischen Informationswissenschaften, Mobilitätsforschung, Transformationsdesign und Technologieentwicklung. KW - Mobilität KW - Transdisziplinarität KW - Reallabor KW - Mobility-as-a-Service Y1 - 2021 SN - 978-3-658-32266-3 U6 - https://doi.org/10.1007/978-3-658-32266-3_18 SP - 313 EP - 328 PB - Springer Gabler CY - Wiesbaden ER - TY - JOUR A1 - Linke, Gunter A1 - Börner, Tommy A1 - Rug, Wolfgang T1 - Untersuchungen zum Verschiebungsmodul verzahnter Balken JF - Bauingenieur N2 - Vor der industriellen Produktion von Stahlträgern und Brettschichtholz boten Zahnbalken eine Möglichkeit große Auflagerabstände im Hoch- und Brückenbau zu überspannen. Verzahnte Balken sind aus heutiger Sicht als nachgiebig zusammengesetzte Biegeträger zu betrachten. Dabei wirken die handwerklich hergestellten Zahnverbindungen in gleicher Weise wie zum Beispiel Dübel besonderer Bauart. Der zur statischen Nachweisführung benötigte Verschiebungsmodul ist in der aktuell gültigen Holzbau-Bemessungsnorm DIN EN 1995–1–1:2010 nicht ausgewiesen. Somit ist es zurzeit nur durch eine versuchstechnische Ermittlung des Verschiebungsmoduls für die jeweilige Zahngeometrie möglich, statische Nachweise durchzuführen. T2 - Experimental studies of slip module for composite beams KW - Balken KW - Verzahnung KW - Biegeträger Y1 - 2022 U6 - https://doi.org/10.37544/0005-6650-2022-06-46 SN - 0005-6650 VL - 97 IS - 6 SP - 186 EP - 191 PB - VDI Fachmedien CY - Düsseldorf ER - TY - JOUR A1 - Lorenc, Wojciech A1 - Kurz, Wolfgang A1 - Seidl, Günter T1 - Hybrid steel-concrete sections for bridges : definition and basis for design JF - Engineering Structures N2 - 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. KW - Verbundbrücke KW - Stahlbetonbrücke KW - Verbunddübel Y1 - 2022 U6 - https://doi.org/10.1016/j.engstruct.2022.114902 SN - 1873-7323 VL - 270 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Zanon, Riccardo A1 - Rademacher, Dennis A1 - Seidl, Günter A1 - Pak, Daniel T1 - Integral VFT-RS composite bridges : efficient standard highway overpasses T2 - IABSE Symposium Prague 2022 : Challenges for Existing and Oncoming Structures N2 - 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%. KW - Verbundbrücke KW - Überführung KW - Autobahnbrücke Y1 - 2022 SN - 978-3-85748-183-3 U6 - https://doi.org/10.2749/prague.2022.1013 SP - 1013 EP - 1020 CY - Zürich ER - TY - JOUR A1 - Lorenc, Wojciech A1 - Seidl, Günter A1 - Berthellemy, Jacques T1 - The evolution of the shape of composite dowels JF - Studia geotechnica et mechanica N2 - 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. KW - Verbunddübel KW - Verbundbrücke KW - Materialermüdung KW - Finite-Elemente-Methode Y1 - 2022 U6 - https://doi.org/10.2478/sgem-2022-0021 SN - 2083-831X VL - 44 IS - 4 SP - 296 EP - 316 CY - Wrocław ER - TY - JOUR A1 - Linke, Gunter A1 - Lübken, Vera A1 - Pfriem, Alexander A1 - Rug, Wolfgang A1 - Weiß, Markus T1 - Bestand statt Austausch - Untersuchungen zum Trag- und Verformungsverhalten von historischen Brettschichtholzbauteilen JF - Bauingenieur N2 - Die Erfindung des Brettschichtholzes durch Otto Hetzer kann zu Recht als Geburtsstunde des Ingenieurholzbaus betrachtet werden. Die Herstellung zusammengesetzter und mittels Leim verbundener Bretter ermöglichte die Herstellung von weitgespannten Holztragwerken bis zu Spannweiten von 40 m. Dadurch wurde der Holzbau wieder konkurrenzfähig gegenüber dem Stahl- und Massivbau. Auch heutzutage existieren noch zahlreiche originalgetreu erhaltene Konstruktionen in Hetzer-Bauweise. Im Sanierungsfall ist eine Einschätzung der Tragfähigkeit erforderlich. Erkenntnisse hierzu können durch Versuche an historischen Bauteilen und Konstruktionen gewonnen werden. Der vorliegende Beitrag beschreibt derartige Untersuchungen zum Trag- und Verformungsverhalten am Beispiel von historischen Brettschichtholzträgern von 1912, die bis 2017 Teil der Dachkonstruktion eines Schulgebäudes waren. Die Ergebnisse zeigen, dass die historischen Brettschichtholzbauteile auch nach mehr als 100 Jahren Standzeit mit modernem Brettschichtholz vergleichbar sind. KW - Material KW - Brettschichtholz KW - Hetzer, Otto Y1 - 2023 U6 - https://doi.org/10.37544/0005-6650-2023-01-02-29 SN - 0005-6650 VL - 98 IS - 1-2 SP - 1 EP - 9 PB - VDI Fachmedien CY - Düsseldorf ER - TY - JOUR A1 - Zanon, Riccardo A1 - Rademacher, Dennis A1 - Seidl, Günter A1 - Pak, Daniel T1 - Integral bridge with RS-Overpass technology : step into the future of standard highway overpasses JF - ce/papers N2 - 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. KW - Verwitterungsstahl KW - Verbundbrücke KW - Autobahnbrücke KW - Stahlbrücke Y1 - 2023 U6 - https://doi.org/10.1002/cepa.1928 SN - 2509-7075 VL - 6 IS - 1 SP - 459 EP - 470 PB - Ernst & Sohn CY - Berlin ER -