DYNAMIC LOADING TEST ON RC FRAME EXTERNALLY RETROFITTED BY CES FRAME

The authors proposed a seismic retrofitting method by attaching CES frames consisting of only steel and fiber reinforced concrete to an existing RC building from the outside. This method has more advantage compared with previous proposed other seismic retrofitting methods that is not necessary to install the braces because CES frames in itself have excellent seismic performance. The purpose of this study is to investigate the seismic performance of RC frame retrofitted by CES frame, particularly to examine the behavior of unified sections by existing RC and strengthening CES. The dynamic loading test was carried out on four frame specimens, one RC frame and three retrofitted frames, with an experimental parameter of the amount of anchor used to connect the CES members to the RC members. This paper outlines the experimental program and shows that the proposed retrofitting method can improve the seismic performance of the existing RC frames and the ultimate strength of the retrofitted frames can be calculated by using the cumulative strength method.