Maximum punching shear resistance of footings with a new punching shear reinforcement

摘要

Due to more compact dimensions and soil-structure interaction, footings and ground slabs achieve significantly higher punching shear resistances than flat slabs. Since the inclination of shear cracks is much steeper in footings, punching shear reinforcement elements with inclined bars seems to be more efficient than vertical bars. On the basis of previous experimental investigations on footings with punching shear reinforcement, a new punching shear reinforcement element with inclined bars was developed. In a first test series, seven tests on reinforced concrete footings with the new punching shear reinforcement elements were conducted, which failed inside the shear-reinforced zone. The tests were planned considering the results of a systematic test series on reinforced concrete footings without and with stirrups as punching shear reinforcement and showed a significant increase in punching shear resistance.