ANALYSIS OF INTERMEDIATE CRACK DEBONDING FAILURE OF EXTERNALLY BONDED FRP-TO-CONCRETE JOINTS WITH ANCHORS

This research investigates the bond behaviour of externally bonded (EB) and hybrid bonded (HB) fibre reinforced polymer (FRP) concrete joints, addressing the issue of intermediate crack debonding (ICD) in RC beams. A numerical model is proposed to simulate ICD by applying one tensile force at each FRP end and implementing different bond-slip laws. Results indicate that adding one anchor to a single-shear configuration enhanced the load capacity compared to EB strengthening, with the lower loaded end being its optimal position. Besides, adding a tensile force at the opposite end of the joint allows the FRP-concrete element to withstand higher loads.Paper 23