The use of the externally bonded reinforcement on groove (EBROG) method for the external strengthening of reinforced concrete members is straightforward and practical; however, the EBROG bond exhibits complex debonding behavior and mechanisms. The behavior of FRP-to-concrete bonds is characterized through analytical solutions founded on the bond-slip relationship, which is represented by either simple or complex models. Simple (bilinear) bond–slip models approximate the interface response using a triangular shape, with an ascending elastic branch and a descending softening branch, providing computational efficiency and practical simplicity. Complex (nonlinear) bond–slip models, such as exponential formulations, capture the continuous bond–slip behavior observed in experiments. If analytical solutions developed using the simple bond-slip model can accurately predict the EBROG bond behavior, they may offer broader applicability than those derived from the complex bond-slip model. Therefore, the primary aim of this study is to provide analytical solutions based on both the simple and complex bond-slip models to predict the EBROG bond behavior. Using the proposed models, a set of differential equations describing bond-slip behavior is formulated and solved under various boundary conditions. The results indicate that both analytical models successfully predict EBROG bond behavior: the simple formulation provides satisfactory accuracy for debonding initiation and bond strength, while the complex formulation achieves higher accuracy in capturing the full debonding process.
