Influence of Interfacial Bond Properties on the Structural Response of Concrete Bonded with FRP

Fibre-reinforced polymer (FRP)-bonded concrete performance relies heavily on bond; therefore, bond-slip models have been developed with interfacial bond properties. Since the structural behaviour of the test specimens bonded with FRP and the failure mechanisms depend on these bond qualities, it is vital to know how sensitive they are. This work examines the interfacial bond-slip characteristics of a bond-slip model with two curves, an ascending and a descending curve, for their sensitivity. The results show that the fracture energy related to interfacial debonding significantly influences the maximum load capacity, while the shape of the ascending curve significantly influences the effective bond length. These results highlight the importance of considering the interfacial bond-slip properties when designing and evaluating concrete structures retrofitted with FRP.