Responses of reinforced concrete members including bond-slip effects

This paper discusses the importance of modeling bond-slip in the response o f reinforced concrete (RC) members. A displacement-based reinforced concret e beam fiber model with bond-slip is presented first. The formulation is ge neral and applies to both monotonic and cyclic loads. It also extends to sh allow beams strengthened in flexure by externally bonded thin plates. Two m ain applications are presented to illustrate the model characteristics. and to show the importance of including bond-slip in modeling reinforced concr ete members. The first application considers a RC column experimentally tes ted under cyclic loads and previously modeled with a fiber element without bond-slip. The second application considers a shallow beam strengthened wit h a fiber reinforced plastic (FRP) plate. In both cases, the model realisti cally predicts not only the strength of the members, but also their stiffne ss and, in the case of the column, the hysteretic energy dissipated during the loading cycles.