Experimentelle Untersuchungen zum Durchstanzen von Einzelfundamenten mit baupraktischen Abmessungen

Experimental Investigations on Punching Behavior of Reinforced Concrete Footings with realistic dimensions

To evaluate the punching shear behaviour of footings with realistic dimensions, punching tests on 13 uniformly loaded specimens were conducted. The dimensions of the footings were between 1.20 m and 2.70 m in square and the thickness of the footing varying between 0.45 m and 0.65 m, resulting in a shear slenderness a&lgr;/d between approximately 1.25 and 2.00.
In all tests, the steel strains of the flexural reinforcement and the stirrups were monitored. To examine internal cracking and failure characteristic, the increase of the slab thickness was measured during testing and together with the saw cuts evaluated. The aim of the present test program in combination with former tests conducted at RWTH University is to study the main parameters, which affect the punching shear strength of footings such as size effect of the effective depth, concrete compression strength, flexural reinforcement ratio, and punching shear reinforcement.