The purpose of this study is to investigate the predicting equation for the punching shear capacity of RC slabs using fiber-reinforced lightweight concrete with steel or polypropylene fibers. The punching shear capacity of RC slabs with fibers increases and the structural behavior is improved by mixing fibers. Establishing the predicting equation, the shear resistance of fiber-reinforced concrete in the tension zone was defined with the post-cracking tensile strength. Furthermore, the depth of neutral axis and the size effect of RC slabs using fiber-reinforced concrete were considered including the test results in the literatures. In the present study, for convenience in calculation, the post-cracking tensile strength and the size effect were consequently adopted into the existing equation and the proposed equation was verified by comparing with the existing test results.
