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Title |
Analysis of the Effect of Improving Seismic Performance of Low-rise Reinforced Concrete Buildings Reinforced with Concrete Filled Tube Method
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Authors |
최홍순(Hong-Sun Choi) ; 허무원(Moo-won Heo) ; 이현호(Hyun-Ho Lee) ; 류정식(Jeong-Sik Ryu) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.2.247 |
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Keywords |
CFT 공법; 인장시험; 에너지 소산 능력; 반복가력실험; 내진보강 concrete-filled tube; pull-out test; energy dissipation capacity; loading cycle test; seismic retrofit |
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Abstract |
This work proposes a seismic retrofit method using concrete-filled steel tube(CFT). To evaluate the effectiveness ofthis approach, a material test was conducted on a post-installed anchor that directly connects the existing frame to the CFT, alongwith a cyclic loading test on a reinforced column. In addition, in order to verify the improvements in seismic performance, two testspecimens were fabricated: a two-story, one-span reinforced concrete frame representing an existing structure and a CFT-reinforcedframe. Both specimens underwent repeated loading tests to measure seismic performance enhancements. The tensile and shearstrength test results of the anchor were found to exceed the average design strength specified by the manufacturer. Experimentalresults from the CFT-reinforced column specimens showed an increase in yield load ranging from about 105% to 125% and anincrease in maximum load from 110% to 140% compared to the reference specimen. As a result of the two-story frame experiment,the CFT-reinforced specimen exhibited a maximum strength of about 2.3?2.6 times greater than that of the non-retrofitted specimen. In addition, the energy dissipation ratio of the non-retrofitted specimen to the CFT-reinforced specimen was approximately 2.22,indicating that the double-frame reinforcement significantly enhanced energy dissipation.
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