Abstract
Present member safety factors for punching shear strength of RC slabs in the specification of Japan Society of Civil Engineers have been determined on the engineering experiences and it is lacking in a theoretical basis. In this study, the accuracy and dispersion of the various calculation formulas proposed before were examined. In order to calculate more appropriate failure probability, several probability distribution functions were applied to each calculation results, considering the ratio of calculation to the experimant as a variable. Calculating method of safety factor for the RC slab member was proposed.
