Behavior Of FRP-To-Concrete Bonded Joints With Anchorage End

A concrete beam can be strengthened by bonding a firbre reinforced polymer(FRP) plate to the tension face. The performance of the interface between FRP and concrete is one of the key factors affecting the behavior of the strengthened structure, and has been widely studied using simple shear tests on FRP plate/sheet-to-concrete bonded joints. While a great deal of research is now available on the behavior of these bonded joints, only stress boundary condition is considered and no closed-form analytical solution has been presented which is capable of predicting the entire debonding propagation process of FRP-to-concrete bonded joints with anchorage end. This paper obtained such an analytical solution for joints with anchorage end in which the realistic bi-linear local bond-slip law is employed and stress boundary conditions are considered. Expressions for the interfacial shear stress distribution and load-displacement response are derived for different loading stages. The debonding process is discussed in detail and the analytical results are compared that of joints with stress boundary conditon. Finally, results from the analytical solution are presented to illustrate how the bond length and free anchorage end affect the behavior of such bonded joints. While the emphasis of the paper is on FRP-to-concrete joints, the analytical solution is equally applicable to similar joints between thin plates of other materials (e.g. steel and aluminum) and concrete.