Axial Behavior of Columns Strengthened with Seismic RC Jacket Section

Abstract

This study proposes steel bar prefabrication technology including V-type supplementary tie and closed hoops for seismic strengthening of deficient columns. The axial concentric behavior of the columns strengthened with proposed approach in the jacket section was examined using five full-scale specimens. Test results showed that the axial strength of the strengthened columns can be estimated conservatively in accordance with the prediction equations of ACI 318-14 approach. The axial ductility of the strengthened columns was 1.4 times as high as that of the existing column. Overall, the proposed technology is effective in enhancing the axial stiffness, strength, and ductility of the deficient columns.