Effectiveness of Concrete Jacketed Reinforced Concrete Frame Subjected to Non-linear Static Analysis

Abstract

To strengthen the existing vulnerable buildings, a variety of strategies and methods have been researched and put into practise recently. Stiffening already-existing structures and/or enhancing irregularities or discontinuities in the stiffness or strength distribution of a building are a few of them. Providing increased strength for the existing structures is the most promising job and to define a suitable strengthening technique needs a technical evaluation. RC (Reinforced Concrete) Jacketing is amongst the earliest and the most popular techniques used to retrofit or strengthen RC columns. In this paper, the seismic response of a 5 storey RC frame building before and after Reinforced concrete jacketing have been analyzed by adopting an incremental non-linear static analysis. Furthermore, change in ductility capacity and elastic stiffness has been evaluated with help of the obtained pushover curve and FEMA 356 coefficient method. The Elastic stiffness for both i.e., the original and the jacketed frame has been calculated by finding out the slope of the elastic region in the pushover curve. The capacity curve obtained from the analysis done in SAP2000, the behaviour of the frame was observed to be linear up to some initial values of the base shear post on which the frame displayed non linearity. It was also observed that after jacketing the columns of the frame, the load carrying capacity of the building has been increased tremendously. Similarly, the roof displacement also showed a significant increase.