Abstract
Reinforced concrete flat slabs supported by columns may fail by punching shear in form of a cone-shaped concrete breakout. To avoid this failure and to increase the shear resistance of a flat slab, shear reinforcement in the slab adjacent to the support can be used. The special Filigran-Punching-Shear-Reinforcement consists of mechanically welded three-dimensional lattice reinforcement and is able to increase the shear resistance of a slab to more than double compared with a slab without any shear reinforcement. This Filigran-Punching-Shear-Reinforcement is used in monolithic slabs and in semi precast slabs as well. In prefabricated lattice girder slabs a parallel arrangement of the punching shear reinforcement is beneficial. In case of monolithic slabs an orthogonal arrangement is more efficient. Both arrangements were tested in full scale tests successfully. The evaluation of eight punching shear tests with slabs of 180 mm to 360 mm thickness led to a European Technical Assessment. The maximum punching shear resistance based on the tested failure loads is 2.1-times of the resistance of slabs without punching shear reinforcement according to Eurocode 2.
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