Abstract
If the axial compressive force as well as the shear force is applied to the interface between flanges of the steel beam and the concrete which is connected by headed studs, shear force or shear force-slip relationships is different from the case where the axial force is not applied is the obvious. In this study, push-out tests of headed studs are conducted with axial compressive force controlled by using hydraulic jacks, and shear capacity and shear force-slip relationships of such studs under both shear force and axial compressive force are investigated. And, the shear capacity formula which is used the coefficient that take into account the influence of axial compressive force is proposed.