SEISMIC PERFORMANCE OF REINFORCED CONCRETE FRAME WITH CONCRETE JACKETED COLUMNS

Abstract

The study presents the effectiveness of Reinforced Concrete (RC) jacketed columns in enhancing the seismic performance of a five-story RC frame. The performance of the structure is examined using a non-linear static method also known as pushover analysis. The retrofitting approach used in this study is a local level approach and its effect on the global behavior of the frame. SAP 2000 has been used to perform the analysis for the frames before and after jacketing the columns. The sequence of hinges formation has been studied for both frames. The change in ductility capacity and elastic stiffness before and after jacketing of the columns is obtained using bilinear curves. Both the structural parameters calculated for existing and jacketed structures showed a substantial increase in their respective values after jacketing. Variation of base shear for both the frames is obtained using capacity curves or pushover curves. The pushover curve obtained as a result of static nonlinear analysis indicated a considerable increase in the strength of the jacketed frame which is almost double the capacity of the existing frame.