Progressive debonding in RC beams shear-strengthened with FRP side strips in hogging moment zone

RC beams shear-strengthened with externally bonded FRP strips on their sides usually fail in shear due to debonding of the FRP strips. The bond behaviour between the FRP strips and the concrete substrate therefore plays a crucial role in the failure process of these beams. Following our previous analytical study on progressive debonding in RC beams shear-strengthened with FRP strips in sagging moment zone, this paper presents an analytical study on the progressive debonding in RC beams shear-strengthened with FRP strips in hogging moment zone. The complete debonding process is analysed and the contribution of the FRP to the shear capacity of the beam is quantified. The validity of the analytical solution is verified by comparing its predictions with numerical results from a finite element analysis.