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Title |
Analysis of the Seismic Isolation Effect of Nuclear Power Plant Electrical Cabinets and Internal Thin Plates using a Shaking Table Test
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Authors |
이종석(Jong-Suk Lee) ; 홍동의(Dong-Uie Hong) ; 이동훈(Dong-Hoon Lee) ; 박진완(Jin-Wan Park) ; 김민준(Min-Jun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.5.40 |
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Keywords |
비구조물; 진동 테이블; 면진; 주파수 응답 함수; 퓨리에 변환; 원전 Nonstructural Component; Shaking Table; Seismic Isolation; FRF; FFT; Nuclear Power Plant |
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Abstract |
Recent earthquake damage surveys in Korea indicate that nonstructural components often experience more than three times the damage of structural components, largely due to amplification of high-frequency seismic waves. Previous studies have focused mainly on structural responses, with limited experimental verification of nonstructural or internal equipment behavior. This study investigates the seismic response of a four-story steel cabinet model with thin plates simulating internal devices, tested on a shaking table with and without seismic isolation. Under non-isolated conditions, internal components showed acceleration responses up to four times greater than the exterior structure, suggesting potential functional failure. In contrast, seismic isolation reduced responses at all measurement points by 60?90%. FRF and FFT analyses confirmed a shift in resonant frequencies and suppression of high-frequency amplification. These findings experimentally demonstrate that seismic isolation tables can contribute not only to structural stability but also to the functional reliability of equipment installed in nonstructural components of nuclear power plants and other critical facilities.
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