Querkrafttragverhalten von großformatigen Spannbetonbalkenelementen mit Plattenbalkenquerschnitt: Ergänzende Laborversuche zu den in-situ-Querkraftversuchen an der Saalebrücke Hammelburg

Shear force bearing behaviour of large-scale T-shaped prestressed concrete beam elements – additional laboratory tests in the context of the in-situ-shear tests on the Saalebrücke Hammelburg. The description of the shear force bearing behaviour of concrete structures in ultimate state is extremely complex, thus this topic is still subject of current research today. In particular, there is still a need for further research to determine the characteristic design parameters for the shear behavior of existing bridges and generally, for large cross-sectional dimensions, which are relevant in construction practice. In this context, this paper deals with the results of large-scale shear tests on prestressed concrete T-beam elements, which were carried out supplementary to and based on in-situ-shear tests on a real, continuous prestressed concrete bridge. The laboratory tests on 1.10 m high prestressed concrete girder elements were carried out using an innovative test concept, the so-called “substructure technique”. In addition to the effectiveness of no longer permitted stirrup types, this publication deals specifically with the influence of the cross-sectional shape on the shear force bearing behaviour and compares the test results with the shear strength determined by current analytical models.