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Dynamic loading tests reveal energy dissipation alterations in repaired ductile RC beams, suggesting implications for seismic resilience.
After an earthquake, the ductile reinforced concrete (RC) beam members in an RC building structure with seismic design may develop moderately damaged plastic hinges, and then the repair should be conducted to recover its functionality. Therefore, to investigate the seismic capacity of a ductile RC beam member with the damaged plastic hinge zone (DPHZ) after the repair is necessary. In this work, six ductile RC beam specimens are designed to obtain the seismic capacity for the repaired specimens. To let the specimens with the specified damaged levels in the plastic hinge zones, the dynamic loading test is conducted. Then, the repair methods, including surface treatment, epoxy low‐pressure injection, and epoxy resin mortar coating, are applied according to the different damage levels of each specimen. Finally, the test results related to strength, stiffness, and energy dissipation are used to quantify the pre‐ and post‐earthquake seismic capacity of a ductile RC beam with the repaired DPHZ, that is, the reduction factors. Additionally, this work also investigates the application of the prediction models suggested in ASCE/SEC 41 for the force–deformation curve on the ductile RC beams with the repaired DPHZ.
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Chiu et al. (2025) studied this question.
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