Seismic assessment and rehabilitation of a RC structure under mainshock-aftershock seismic sequences using beam-column bonded CFRP strategy

A mainshock is usually accompanied by a group of ground motions. In many design codes, the effects seismic sequences have been neglected or underestimated. Aftershocks can increase structural damage even cause failure. The current study evaluated behavior rehabilitated and as-built reinforced concrete (RC) structure under real scaled mainshock-aftershocks using nonlinear analysis. Verification was done in three modes. inter-story drift ratio, maximum residual, relative displacements were studied. showed that residual displacement grew, on average, more than 78% mainshock-aftershock sequence compared to mainshock-only record. beam-column bonded Carbon-fiber-reinforced polymers (CFRP) rehabilitation strategy six layers T-700 CFRP chosen based specific performance level. ability transfer plastic strain from columns beams, which could be considered as change weak column-strong beam concept strong column-weak concept. Compared sequences, an average growth − 81% first-story significant. Unlike structure, caused no structure. It also observed ratio aftershock peek acceleration (PGA) PGA intensive effect both structures.