Fundamental Analysis of RC lap Splices

Abstract

An analytical model is presented to evaluate the local bond-slip relationship in RC lap splices considering the influence of splitting cracks, friction between the concrete and rib face, microscopic fracture of concrete in front of rib face, flexural deformation of the cover concrete and stirrups. The local bond-slip relationship is integrated along the splice length considering the strain in the concrete in the longitudinal direction. It is shown that the lack of friction at a rib face due to epoxy coating reduces the ductility of the local bond slip relationship without stirrups, resulting in lower splice strengths. The contribution of stirrups, and is the function of concrete strength rather than the yield strength of the stirrup.