Reduction of punching shear reinforcement: New experimental results on punching shear behavior of flat slabs with varying amount of punching shear reinforcement

摘要

With introduction of Eurocode 2 in Germany, the punching shear design provisions for flat slabs were revised. In consequence of limited anchorage conditions of punching shear reinforcement elements in flat slabs depending on the effective depth, only a reduced steel strength may be used in the calculation of the steel contribution. Due to the lack of systematic tests and safety related concerns, the amount of punching shear reinforcement in flat slabs within the 1st and 2nd row was significantly increased in German Annex of Eurocode 2 (EC2NA) compared to the general Eurocode 2. The results of existing punching tests on flat slabs can be used to evaluate the code equations for punching shear capacity without shear reinforcement (Fig. (a)) and maximum punching shear capacity (Fig. (d)). Nevertheless, due to the lack of systematic test series on flat slabs with a failure inside the shear-reinforced zone (Fig. (b,c)), an evaluation of the code provisions for the design of the shear reinforcement has not yet been possible.