Abstract
Debonding along FRP-concrete interface is regarded as one of the most significant fracturing behaviors in FRP-strengthened concrete structures. To model FRP-concrete interfacial bond behavior in experiment, several kinds of local shear stress-relative displacement (τ-δt) relationships are proposed. The results of finite element simulation and theoretical derivation are compared. The linear ascending and descending τ-δt, relationship is regarded as an applicable and accurate model, and is used in this paper. The observed experimental failure modes and cracking behaviors are simulated through a parametric study of bond interface properties and concrete fracture energy, whose effects on load-carrying capacity and concrete crack distribution are studied.
