SOLUTION OF THE AXISYMMETRICAL PUNCHING PROBLEM OF CONCRETE SLAB BY THE TWIN SHEAR STRENGTH THEORY

in this paper, the axisymmetrical ultimate punching Strength of concrete slabs is obtained by using the twin shear strength theory. Rigid-plastic model has been adopted, an axisymmetrical failure mechanism given, the envelope of failure Mohr circles is found to be two straight lines. Then,the upper-bound of ultimate punching load is obtained by the virtual work equation. The numerical results are shown to be satisfactory compared with known results.