Abstract
This study is concerned with the behaviors of boundary connection between existing R/C member and added strengthening member which have various reinforcement method. Most of connections were retrofitted by the spiral bar all this while, but it was difficult to arrange it to the proper pitch when there were many other reinforcements in the connection. Thus, in this study, four reinforcement types of connection(no reinforcement, spiral bar, ladder bar, mesh bar) were tested, and the effect of the difference of reinforcement were examined by the static shear loading test. It was recognized that the difference of reinforcement have an little effect on the load carrying capacity of retrofitted shear walls, but four reinforcement types showed obvious difference about the improvement of ductility. It was found that mesh and ladder bar types were superior to no reinforcement and spiral bar types for the improvement of ductility of concrete walls.
