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진동시험을 통한 강판콘크리트(SC) 전단벽의 저응력수준에서의 구조 감쇠비 규명
조성국,소기환,김두기,한상묵,Cho, Sung Gook,So, Gihwan,Kim, Doo Kie,Han, Sang Mook 대한토목학회 2015 대한토목학회논문집 Vol.35 No.2
SC (steel plate concrete)구조는 새로운 구조형식으로서 SC구조물의 내진설계에 적용할 수 있는 감쇠비의 규명이 필요하다. 이 연구에서는 실험적 방법을 통해 SC구조의 감쇠비를 분석하였다. 연구를 위하여 SC 전단벽 시편을 제작하고, 대형 진동대를 이용하여 진동시험을 수행하였다. 시험에서 계측한 가속도응답신호는 전달함수로 변환한 후 동적실험모드분석기법을 적용하여 분석하였다. 구조물의 감쇠비는 입력운동의 수준에 따라 달라질 수 있으며, 이 연구의 실험에서 적용한 입력운동의 수준은 시편의 항복강도의 절반보다 낮은 수준으로서 여기서 분석된 구조감쇠비는 약 4%정도이다. 이 연구결과를 고려하여 SC구조물의 운전기준지진에 대한 내진설계에는 4% 감쇠비를 적용할 수 있을 것으로 판단된다. Steel plate concrete (SC) structure has been developed as a new structural type. Rational damping value shall be determined for the seismic design of SC structure. This study evaluated damping ratio of SC structure through experiments. For the study, a SC shear wall specimen was constructed and dynamically tested on the shaking table. Acceleration time history responses measured from testing were converted to the transfer functions and analyzed by using experimental modal analysis technique. The structural damping ratio of the specimen was identified as 4% to critical. Considering the shaking table test was performed at the excitation level corresponding to the low stress level of the specimen, 4% could be suggested as a structural damping for design of SC structure for operating basis earthquake.
앵커기초의 균열을 고려한 모형 전기 캐비닛의 지진거동특성 분석을 위한 진동대실험
윤다운(Da-Woon Yun),전법규(Bub-Gyu Jeon),김성완(Sung-Wan Kim),소기환(Gi-Hwan So),이승준(Sung-Jun Lee) 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.3
During the safety assessment of nuclear power plants, it is important to verify the performance of safety-related equipment and examine the performance deterioration caused by aging. In this study, an electrical cabinet model and anchor foundation were designed and manufactured based on the results of the Kori Unit 1 field survey to confirm the seismic performance of the equipment under seismic load. Shake table tests were conducted considering cracks as an aging condition; subsequently, the seismic behavior characteristics of electrical cabinet model were analyzed and compared under seismic loads. The experimental results indicated that the damage inflicted on the electrical cabinet model under seismic load was confirmed to be caused by the anchor bolt. The failure of electrical cabinet model without cracks in the anchor foundation occurred first, confirming that the acceleration response amplification was larger in this region. It was estimated that a crack in the 0.5 ㎜ anchor foundation considered as an aging condition of the electrical cabinet model may not affect the seismic performance deterioration.