SOLUTION OF AXISYMMETRICAL PUNCHING STRENGTH OF CONCRETE SLABS WITH THE UNIFIED STRENGTH THEORY

A theoretical solution of the punching shear strength of a concrete slab is obtained in this paper. The problem is treated as a three-dimensional axisymmetrical one, the material being assumed to be rigid-plastic. Yu's unified strength theory (UST) is used for the failure criterion of concrete. The UST can take account of the intermediate stress effect. By establishing the virtual work equation, a series of upper-bound of ultimate punching loads are obtained. The influence of variables, such as the size of loaded area and the coefficient b, on the ultimate punching load is investigated. The theoretical model is verified through comparison with Jiang-shen model and experimental results.