Cohesive Crack Models and Finite Fracture Mechanics analytical solutions for FRP-concrete single-lap shear test: An overview

In the present paper we review and compare several analytical models describing the single-lap shear test, which is the most common test to determine the bonding behaviour between a strengthening FRP plates and the concrete substrate. The models are one-dimensional and formulated under the assumption that debonding occurs as a pure mode II cracking process throughout a zero-thickness interface between the FRP strip and the brittle substrate. As such, they are all amenable of an analytical treatment. The FRP-concrete interface is described by at most three parameters among the interfacial fracture energy, the tensile strength and the elastic stiffness. Particularly, we compare the effective bond length estimates provided by different models and compare them with the ones present in Design Codes. Finally, a comparison with experimental data sets available in the Scientific Literature is also given.