SEISMIC FRAGILITY ANALYSIS ON NON-DUCTILE RC FRAME STRUCTURES RETROFITTED WITH FRP

Seismic fragility analysis is performed for non-ductile reinforced concrete (RC) frame structures retrofitted by FRP. Three non-ductile RC frames designed with 3, 6 and 9 stories are used as the study cases. Three different rehabilitation strategies are adopted for each case structure. The cloud method and the Pushover method are used for the assessment of seismic demand and seismic capacity, respectively. The derived seismic fragility for the non-ductile RC frames retrofitted w/o FRP is compared to evaluate the effect of FRP rehabilitation. The results show that FRP rehabilitation is an effective alternative to improve the seismic performance of non-ductile RC frame structures. Among the adopted rehabilitation strategies, the one used to strengthen the lower stories can mostly promote the seismic capacity of the non-ductile RC frames. Moreover, the improvement of structural performance due to FRP rehabilitation is related to the height of the non-ductile RC frames. With a given rehabilitation strategy, the higher the frame is, the less improvement on structural performance is obtained.