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Title |
Evaluation of Energy Dissipation and Seismic Performance of Reinforced Concrete Frames According to Steel Damper Application Method
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Authors |
서우석(Woo-Seok Seo) ; 이현호(Hyun-Ho Lee) ; 허무원(Moo-Won Heo) ; 김현생(Hyun-Saing Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.3.69 |
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Keywords |
강봉댐퍼; 연성능력; 에너지 소산능력; 내진보강 Steel rod damper; Ductility; Energy dissipation capacity; Seismic strengthening |
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Abstract |
This study conducted cyclic loading tests on three reinforced concrete frame specimens to evaluate the seismic strengthening performance of reinforced concrete frames: an unreinforced specimen (BF), a strengthened specimen with a knee-brace damper installed at the lower part of the frame (RV2), and a newly proposed strengthened specimen with a steel rod damper (SRD-4). The moment?drift ratio behavior, yielding characteristics, stiffness degradation, cumulative energy dissipation capacity, longitudinal rebar strain, and damper strut strain of the specimens were comparatively analyzed. The results showed that BF exhibited the poorest behavior in terms of strength and deformation capacity, while RV2 showed superior performance in terms of initial stiffness and peak strength. In contrast, although SRD-4 exhibited a slightly lower peak moment than RV2, it maintained more gradual post-peak strength degradation and stable behavior, demonstrating superior ductile behavior up to larger displacement levels. In addition, SRD-4 showed the largest cumulative energy dissipation capacity, and the comparisons of rebar strain and damper strain indicated that deformation was more evenly distributed in SRD-4. Therefore, the proposed SRD-4 strengthening system using a steel rod damper can be considered an effective seismic strengthening method for improving the ductility and energy dissipation capacity of reinforced concrete frames.
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