The effect of FRP retrofitting on the seismic resilience of low-ductility RC frame structures: a case study

This study investigates the effect of Fiber Reinforced Polymer (FRP) retrofitting on the seismic resilience of low-ductility reinforced concrete (RC) frame structures. The finite element model for low-ductility RC frame structures retrofitted with FRP wraps is established using OpenSEES. Fragility functions for low-ductility components before and after retrofitting are developed. Using the PACT software, the seismic resilience in terms of annual repair costs, repair time, casualties, and carbon emissions is evaluated for low-ductility RC frames w/wo FRP retrofitting. The results show that FRP retrofitting could improve the seismic resilience of low-ductility RC structures, especially at relatively low seismic intensities. Due to FRP retrofitting, the average annual repair cost, repair time, and carbon emission are reduced by 5.32%, 6.90%, and 7.16%, respectively. In addition, the FRP retrofitting would greatly improve human safety and almost no death would occur. Meanwhile, the annual average number of injuries is reduced by 57.6%.