Retrofitting Of Reinforced Concrete Column by External Jacketing

Abstract

The main reason of the project is to gain the fundamental and technical knowledge of seismic resistant buildings. Because now a day the construction of seismic resistance buildings are increased. Since the future expansions are viable, a framed structure has been selected in consideration with the increased loading. In this project an attempt has been made to design square column strengthened by steel angle and strips (steel cage) by using diagonal steel plate in stainless steel material. Size of the steel angle, strip spacing, grout material between column side and angle, and the connection between the steel cage to the specimen head, were the main studied parameters in this paper. It was concluded that using this strengthening method will be very efficient and a gain in the axial load capacity of the strengthened columns was obtained. This gain was due to the confinement effect of the external steel cage, and the ability of the steel angle to resist an extensive part of the applied axial load. The failure in most of the strengthened specimens was due to the buckling of the steel angle followed by crushing of the original columns.