Flexural strength of the strength-ductility type seismic retrofit technique of RC columns using PC bar prestressing and steel plates

Abstract

The thick hybrid wall (THW) technique is a strength-ductility-type seismic retrofit technique for reinforced concrete (RC) columns. In this method, an RC column and an additional wing wall are jacketed by flat or channel-shaped steel plates connected together by high-strength steel bars. The most important role of the additional wing wall is to work in compression; therefore, all the longitudinal reinforcements in the tension and compression sides of the RC column can yield in tension. In this study, equations of the ultimate moment resistance and the minimum wing wall length of the THW column section are proposed.