Numerical study of structural behavior of fiber-reinforced polymer-strengthened reinforced concrete beams with bond-slip effect under cyclic loading

Two simple finite element models denoted as FEM‐B and FEM‐BC are developed in this paper to investigate the structural behavior of fiber‐reinforced polymer (FRP) strengthened reinforced concrete (RC) beams under static and cyclic loading. First, the FEM‐B is developed for analysis of FRP‐strengthened RC beams under static loading and the bond‐slip effect between FRP, adhesive and concrete is included. Then FEM‐BC is developed based on FEM‐B for analysis of structural behavior of FRP‐strengthened RC beams under cyclic loading, and degradations of material properties of concrete, steel reinforcement, and FRP due to cyclic loading are taken into account. The developed FEMs are validated against experimental results and demonstrated to be effective for structural analysis of FRP‐strengthened RC beams. Furthermore, parametric studies are carried out to learn the effects of types, thickness, and length of FRP on the structural behavior of FRP‐strengthened RC beams based on the FEM‐BC model. The research findings are summarized finally.