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Title Seismic Performance Evaluation of Non-Seismic Reinforced Concrete Buildings Strengthened by Double Frame Method
Authors 권준석(Jun-Seok Kwon) ; 허무원(Moo-Won Hur) ; 이현호(Hyun-Ho Lee) ; 류정식(Jeong-Sik Ryu)
Page pp.235-242
ISSN 1229-5515
Keywords 이중프레임 공법; 인장시험; 전단연결 실험; 에너지 소산 능력; 내진보강 double frame method; pull-out test; vertical connector test; energy dissipation capacity; seismic retrofit
Abstract In this paper, a seismic reinforcement method using a double frame (double frame method, DFM) is proposed. The performance test involves a material test of a post-installed anchor that directly connects the existing frame to the DFM, and a shear performance test of the vertical connector. In addition, in order to verify the improvement of seismic performance, a two-story, one-span reinforced concrete existing frame test specimen and a double-frame reinforced frame test specimen were manufactured to examine the effectiveness through repeated loading experiments. As a result of the anchor’s pull-out test, the average tensile strength was 27.9 kN, exceeding the average design strength of 21.7 kN as suggested by the manufacturer. The shear strength test results of the anchor showed an average of 28.7 kN. From the vertical connector test, the internal force per anchor was 46.83 kN, which is approximately 163 % greater than the single anchor design shear strength of 28.7 kN. Therefore, it is considered appropriate to reflect the single anchor test results in a design. As a result of the two-story frame experiment, the double-frame reinforced specimen showed a maximum strength of about 4.0~4.5 times that of the non-seismic specimen. Furthermore, the ratio of energy dissipation of the non-seismic specimen to the energy dissipation of the double-frame reinforced specimen is about 4.00~4.58, showing that energy dissipation by double-frame reinforcement is significantly larger.