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Title |
Analysis of Seismic Performance Enhancement Effects of Externally Attached Seismic Retrofit Methods Based on Foundation Joint Status
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DOI |
https://doi.org/10.4334/JKCI.2026.38.2.203 |
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Keywords |
CFT 공법; 내진보강; 반복가력실험; 강성저하; 에너지 소산 능력 concrete filled tube; seismic retrofit; loading cycle test; stiffness degradation; energy dissipation capacity |
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Abstract |
In this study, cyclic loading tests were performed on two-story reinforced concrete (RC) frame specimens to evaluate the seismic strengthening effects of an externally attached concrete-filled steel tube (CFT) retrofitting method, focusing on the installation location and foundation connection conditions. The experimental results showed that the externally attached CFT system was structurally linked to the existing columns, thereby sharing the entire load. All specimens exhibited a common failure pattern, with shear failure occurring at the base of the first-floor columns. After reinforcement, damage to the existing columns tended to be relatively delayed, which is believed to be a result of the externally attached CFT seismic retrofit method reducing the required deformation of the existing columns by sharing the lateral load. Furthermore, the maximum load capacities of the specimens with foundation anchorage increased by approximately 1.47 and 1.61 times, respectively, compared to the reference specimen. The presence of foundation anchorage effectively suppressed rotational deformation during the initial loading phase, thereby maintaining the structural system’s stiffness. These findings suggest that the foundation anchorage condition plays a critical role in ensuring the initial stability of the externally attached CFT seismic retrofitting method.
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