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

Reduction of punching shear reinforcement

Fig.: Saw-cuts of selected specimens: Punching failure without shear reinforcement (a), punching failure inside shear-reinforced zone (b,c), and maximum punching shear failure (d)

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...

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