With projecting loops to peak load - Punching shear tests on precast concrete slabs lead to European Technical Approval (ETA)

摘要

Flat slabs made as precast reinforced-concrete slabs with lattice girders and an effective in-situ concrete topping prove to be cost-efficient. Nevertheless, such flat slabs - in contrast to line supported floors - have frequently been designed as mere cast-in-situ concrete structures so far. For one reason, this was due to the minor increase of the punching shear resistance caused by the lattice girders used as punching shear reinforcement. Another reason was the lack of knowledge concerning possible positioning of precast concrete slabs directly at the column. Punching shear tests on cast-in-situ concrete structures with incorporated reinforcement for such case of application did not permit conclusion on the permissible space between the precast concrete slabs and the columns.