Numerical simulation about dynamic bond-slip between reinforcing steel bar and concrete

Abstract
Bond slip between reinforcing steel bar and concrete is one of the fundamental principles to investigate the failure mechanism of reinforced concrete and many experimental investigations use of either the pull-out or push-out of a steel bar from the surrounding concrete material to allow for better control and visual analysis of the failure process. In this paper, the dynamic bond strength of the interface between steel rebar and concrete is investigated by using the push-out method in a modified numerical SHPB system. Numerical calculation is carried out in nonlinear finite element (FE) code ABAQUS and the brittle cracking model and elastic model are applied as the constitutive relationship of concrete and aluminum bar materials, respectively. The bond-slip and dowel action is simulated by defining the contact between the concrete and the steel rebar. Push-out numerical simulation tests with short embedment length are carried out within a wide range of loading velocity. The validity and reliability of the modified SHPB method is verified by comparing with experimental data in the reference [Li Xudong et al., Acta Scientiarum Naturalium Universtiy Pekinensis, Vol.44, No.1, Jan 2008, pp.1-5.], and the process and fracture mechanism of the interface under impact loading is studied.