Abstract：The interfacial bonding and anti-tensile behavior between FRP and concrete is the key problem for the application of FRP to strengthen concrete structures. In this paper, the 3D Parallel Realistic Failure Process Analysis (RFPA3D-parallel) is employed to investigate the bonding behavior in FRP-concrete interface based on the single shear testing results on FRP-concrete in laboratory. Numerical simulations visually reproduce the complete three-dimensional debonding process and characteristics of FRP bonded to concrete, which is a progressive process induced by meso-scopic cracks initiation and growth and macroscopic fractures form. The damage of FRP-concrete structures under external loading can be founded by monitoring the acoustic emission induced by microcracking in FRP-concrete. Based on the simulated stress evolution and deformation distribution along the length FRP sheet, the deformation and debonding failure can thus be divided into four stages, i.e., elastic, elastic-softening, elastic-softening-debonded and softening-debonded stage. The numerical approach in this study provides a useful tool for enhancing our understanding of cracking and debonding failure process and mechanism of FRP-concrete and our ability to predict mechanical performance and reliability of these FRP sheet bonded to concrete structures.
2011, Vol. 32 
