2020 Volume 76 Issue 4 Pages 360-373
The aim of this study was to investigate the effect of in-plane confining pressure on the punching shear resistance of RC slabs through punching shear loading test and non-linear finite element analysis. In order to analyze the punching shear fracture behavior of RC slabs subjected to in-plane confining pressures, it was specifically essential to use a constitutive model that can appropriately express the stress-strain relationship of concrete under triaxial compressive stress. As a result, it was shown that the punching shear resistance of RC slabs subjected to in-plane confining pressure could be evaluated from the pyramidal shell model based on the punching shear fracture load bearing mechanism by treating the in-plane confining pressure as an equivalent conversion rebar ratio. Furthermore, in this study, the design formulae of punching shear resistance considering the influence of in-plane confining pressure in the design standards of foreign countries were also examined.