RETROFITING OF REINFORCED CONCRETE COLUMNS USING COMPOSITE JACKETING

Abstract

Columns are important cause for the stability of a constructed building, which are widely used in building frames and carries compressive loads. The purpose of Reinforced Concrete (RC) columns jacketing in this study is retrofitting of existing columns with poor structural performance and increase their strength and ductility. The methodology used is modeling and simulation for predicting performance in the real world. Simulation and modeling is used to understand whether under what condition and in which way a part will fail and what loads it can withstand. In this research work, it is found that the strength and cross section of the overlay concrete has significant effect on the capacity of axially loaded reinforced concrete composite jacketed columns. For C30, C50 and C70 concrete grade in the core the axial capacity of the jacketed column is enhanced by 3-10%. On the other hand, using different thickness and the same concrete grade considered, the axial capacity of the reinforced concrete jacketed column is 50-56% higher than axial capacity of the old concrete section. Similarly, for same grade of concrete of C30, C50 and different cross section the change in the capacity of the reinforced concrete composite jacketed axial columns became 148.3% and 161.6% of the core section respectively. It is also found that, the capacity of reinforced concrete composite jacketed axial columns is slightly affected by the variation loadings (eccentricity effect). Experimental model is used to calibrate the interface properties and material models in ABAQUS