Abstract
During earthquakes poor shear strength and non-ductile detailing of beam-column 'joints are identified as the principal cause of collapse of many pre-seismic code designed framed structures. In this paper. efficiency and effectiveness of fiber reinforced polymers (FRP) in upgrading the shear strength and ductility of seismically deficient beam-column joints have been studied. For this purpose, first an interior RC beam-column Joint which Simulates nonductile detailing characteristics of pre-seismic code construction is tested. After testing of above Joint, the same specimen was repaired/upgraded using CFRP sheets and tested again under similar loads. The results are compared through general behavior, hysteretic loops, load-displacement envelops, and ductility. The comparison shows that FRP improves the shear resistance of the joint and increses its ductility to a great extent.