REHABILITATION OF REINFORCED-CONCRETE FRAME CONNECTIONS USING CORRUGATED STEEL JACKETING

An experimental investigation was conducted to study the failure mode of existing reinforced concrete beam-column connections designed durin g the 1970s. The effectiveness of using innovative corrugated steel ja ckets for enhancing the seismic shear strength and ductility of these types of connections was examined. Four large-scale beam-column connec tions were tested under cyclic loading. The four connections represent existing frame connection, current code derailed, and two rehabilitat ed connections. The variables in the test specimens included the amoun t of joint and column transverse reinforcement and the jacketing of co lumn only or both column and beam. Test results indicated that the she ar strength of jacketed joints can be estimated using an approach that is similar to the current design recommendations for beam-column join ts. The corrugated jacket was found to be efficient in the rehabilitat ion of existing structures not meeting current seismic code requiremen ts. A method is proposed for the design of the corrugated steel jacket to enhance the shear strength and ductility of the the beam-column jo int.