Simulation of bond failure in RC beams strengthened with FRP sheets subjected to dynamic/impact loadings

This paper presents a combined finite/discrete element method for 2D and 3D modelings of strengthened RC beams subjected to dynamic/impact loadings. The main task is set on developing an algorithm for simulation of potential bonding and debonding/delamination phenomena during impact or general dynamic loading conditions. The proposed approach adopts a general node to face nonlinear frictional contact algorithm to enforce the bonding/debonding constraints between concrete and FRP. Parameters required by the contact mechanics procedures are determined from the bonding properties. Furthermore, a bilinear softening model for adhesive layer coupled with a mixed mode fracture model has been utilized. The validity of developed algorithm is verified with available experimental and numerical benchmarks.