Debonding of FRP plated concrete: A tri-layer fracture treatment

A tri-layer interface fracture energy model is developed to facilitate the quantification of various debonding scenarios in fiber reinforced polymer (FRP)/epoxy/concrete plated systems. The work is motivated by the relatively thick adhesive bond line generally encountered in such retrofitted systems. With the explicit material and geometric descriptions and the fairly general boundary conditions, the model provides a basis for parametric study and modeling of debonding in different specimen configurations. Comparison of the derived model specialized for peel and shear debonding with results from finite element modeling demonstrates the robustness of the derived model as an effective means to investigate FRP debonding as a basis for design.