Shear Assessment of Precast composite girders using FprEN 1992-1 based shear expressions
Mohammed S. Ibrahim (TU Delft - Concrete Structures)
Marco Roosen (TU Delft - Concrete Structures, Rijkswaterstaat)
Max A.N. Hendriks (TU Delft - Engineering Structures, Norwegian University of Science and Technology (NTNU))
Yuguang Yang (TU Delft - Concrete Structures)
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Abstract
Inverted T precast girders with a cast-in-situ topping layer, recognized as precast composite girders, are commonly used in Dutch bridge construction. Notably, the bridges built before 1974 often lacked sufficient shear reinforcement, raising concerns about their shear capacity under increasing traffic loads. However, how to assess these composite girders under the scope of the second-generation Eurocode remains challenging, as the shear formulations were originally developed for monolithic structural members. Consequently, their direct applicability to precast composite systems, due to the distinctive stress distribution in the web of the composite structural members, lacks theoretical substantiation and experimental validation. This study first presents the three alternative failure criteria equations based on the same theory, and after that, an experimental investigation of the shear behaviour of precast composite girders through two full-scale tests is discussed. The test data is later used to compare the alternative failure criteria.