Retrofitting of Reinforced Concrete Beam-Column Joints by Composites-Part II: Analytical Study

Beam-column joints (BCJs) in reinforced concrete (RC) structural systems are the critical regions, especially when they are subjected to high shear demands. According to earthquake reports and joint subassembly tests in the literature, mostly brittle failures were experienced due to inadequate design detailing. To avoid such failures, several strengthening techniques were developed for weak BCJ regions such as externally applied steel and RC jackets, and fiber-reinforced polymer (FRP) materials. Experimental results revealed alleviation of these deficiencies and improved shear capacities of the strengthened joints.