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Gewählte Publikation:

Huber, P; Kromoser, B; Huber, T; Kollegger, J.
(2016): Experimental investigation of the shear behavior of post-tensioned beams with a minimum amount of transverse reinforcement
BAUINGENIEUR-GERMANY. 2016; 91: 238-247.

Existing post-tensioned bridge girders with a low amount of shear reinforcement are often unable to meet current shear design requirements. This underachievement can be traced back to the changes in the code provisions. To get more information about the shear behavior of these types of structures, four large-scale shear tests were performed. Based on the photogrammetric measurements of the kinematics and the shape of the critical shear crack it could be demonstrated, that the shear resistance of the transverse reinforcement is not sufficient to explain the load carrying capacity regarding shear. Furthermore, it could be shown, that due to the pronounced crack opening the aggregate interlock effect does not contribute to the shear strength at the state of failure. A comparison of the test results with various code provisions confirmed, that the truss model approach with a variable strut inclination of the basic document of Eurocode 2 is not capable to reflect the experimental shear strength. Although the third level of approximation of Model Code 2010 is able to predict the failure load more precisely, this approach still leads to conservative results. Therefore, the use of more refined models is necessary for the assessment of such bridge structures, in order to take into account the bearing capacity of the concrete itself in addition to the shear strength of the transverse reinforcement.
Autor*innen der BOKU Wien:
Kromoser Benjamin

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