Abstract
To establish a numerical analysis method for appropriate evaluation of the failure behavior of flexural strengthened RC beams with FRP sheet bonding on tensile surface, three-dimensional elasto-plastic finite element analysis was performed proposing a new interface model to better simulate debonding behavior of FRP sheet. From this study, following results were obtained: 1) by applying the proposed interface model, debonding behavior of FRP sheet can be rationally analyzed in spite of material properties of FRP sheet and/or magnitude of sheet volume; and 2) the debonding behavior of FRP sheet due to a peeling action of the concrete block formed in lower cover concrete near loading points can be numerically confirmed.
