Investigation of the strength-ductility-type seismic retrofitting technique for existing RC columns using PC bar prestressing and steel plates

Abstract

This study explores an economic and convenient seismic retrofitting technique wherein a cast-in-site partial thick hybrid wing-wall is built using additional concrete sandwiched by steel plates and high-strength steel bars prestressing, called the thick hybrid wall (THW) technique. The aim of this study is to experimentally investigate the shear resistance and shear strength of the arch mechanism of this technique using retrofitted RC columns with no bonding force of longitudinal bars, and by obtaining test results of flexural strength using retrofitted RC columns with bonded longitudinal bars. Proposed equations of the shear strength (arch mechanism) of this technique were verified.