Interfacial stress analysis of the adhesively bonded joints

To attain a suitable strengthening system for concrete structures, adequate stress distribution between externally bonded fibre reinforced polymer (FRP) materials and the substrate is required. With the growing application of FRP in the strengthening of structures and in order to be able to sufficiently model the strengthened structure behaviour, the need for a generic bond relationship is increasing. Hence, this research investigates the bond between concrete substrates and the FRP composites through an analytical approach. The model is developed for the estimation of the local and global strain profile by which the interface shear stress along the bonded length is determined. In addition, by proposing continuously differentiable nonlinear functions, the relative slip between two adherents is derived. The accuracy of the proposed relationship is verified by comparing the experimental and analytical results.