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Institut
Die Kunst der Diagnose
(2023)
Structural assessments of existing older prestressed concrete bridges according to the currently applicable standards and guidelines in Germany generally reveal significant deficiencies in shear reinforcement. Large-scale tests within the scope of research activities commissioned by the Federal Highway Research Institute (BASt) were carried out at TU Dortmund University to analyze the shear load-bearing behavior of continuous prestressed concrete beams in more detail. The Arch Action Model (AAM) was derived from the Simplified Arch Action Model (SAAM) to provide a possible analysis method for determining shear contribution from concrete. Thus, the shear capacity of prestressed beams can be determined in a more realistic manner than using the truss model underlying the current state of standardization. The paper at hand provides information and explanations about the SAAM and AAM with regard to their application to real-world structures for structural bridge assessments.
Wenn die Energiebilanz eines Gebäudes über den Lebenszyklus betrachtet wird, ist neben einem energieeffizierenten Gebäudebetrieb die graue Energie der Baukonstruktion und die lange Lebensdauer der eingesetzten Baustoffe relevant. Von Bedeutung sind zudem die bauphysikalischen Eigenschaften des Materials, von denen abhängt, ob passive Maßnahmen zum Komfort ausreichen oder ob ein höherer technischer Aufwand erforderlich ist, der weitere Energieverbräuche in Herstellung und Nutzung nach sich zieht. In Forschungsprojekt "Variowohnen" wurden die Bauteile hinsichtlich ihrer technischen, ökologischen und ökonomischen Performance über den Lebenszyklus betrachtet und mit alternativen Ausführungsvarianten verglichen.
Alles im Blick?
(2020)
Oftmals bleiben Probleme oder Zielkonflikte bei der Umsetzung von Energiekonzepten in herkömmlichen Planungsprozessen unerkannt oder werden zu spät entdeckt. Fehlende Abstimmungen oder Missverständnisse unter den Planungsbeteiligten können die Qualität der Ausführung hinsichtlich der energetischen Ziele mindern und Kostensteigerungen sowie Bauzeitverzögerungen nach sich ziehen. Mit einer integralen Planung und Nachhaltigkeitszertifizierung lassen sich Widersprüche frühzeitig erkennen und die Prozesse optimieren. Im Forschungsprojekt "Variowohnungen" wurden unter anderem die Planungsprozesse in Bezug auf die Nachhaltigkeitsanforderungen untersucht.
Industrie und Natur
(1998)
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.
Section, strain and stress
(1998)