Responses of Reinforced Concrete Members Including Bond-Slip Effects

This paper discusses the importance of modeling bond-slip in the response of reinforced concrete (RC) members. A displacement-based, reinforced concrete beam fiber model with bond-slip is presented first. The formulation is general and applies to both monotonic and cyclic loads. It also extends to shallow beams strengthened in flexure by externally bonded thin plates. Two main applications are presented to illustrate the model characteristics and to show the importance of including bond-slip in modeling reinforced concrete members. The first application considers a RC column experimentally tested under cyclic loads and previously modeled with a fiber element without bond-slip. The second application considers a shallow beam strengthened with a fiber reinforced plastic (FRP) plate. In both cases, the model realistically predicts not only the strength of the members, but also their stiffness and, in the case of the column, the hysteretic energy dissipated during the loading cycles.