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

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Abstract

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

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  1. Kharazmi University, Faculty of Engineering, Tehran, Iran

    Omid Karimzade Soureshjani & Gholamreza Nouri

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  1. Omid Karimzade Soureshjani
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Soureshjani, O.K., Nouri, G. Seismic assessment and rehabilitation of a RC structure under mainshock-aftershock seismic sequences using beam-column bonded CFRP strategy. Bull Earthquake Eng 20, 4989–5016 (2022). https://doi.org/10.1007/s10518-022-01382-3

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