Shear Strength of RC Jacketed Interior Beam-Column Joints without Horizontal Shear Reinforcement

This study investigates the seismic performance of poor beam-column joints strengthened with reinforced concrete (RC) jackets. The interior joint shear strength of nonductile frames was strengthened with RC jackets, but no new joint shear hoops and no dowel anchors were installed into the new and old concrete interface. Seven one-way interior beam-column joint subassemblages were tested under quasistatic cyclic loading to observe the joint shear strength and overall frame performance. The test measurements are also used to verify two of the analytical models used for predicting the horizontal shear strength of jacketed joints without horizontal joint shear reinforcement. The results show that the RC jacketed scheme is able to efficiently rehabilitate nonductile frames with very poor joint details. Both of the analytical models were able to predict the jacketed joint shear strength with a feasible accuracy.