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Title |
Earthquake Response Analysis of a Nuclear Facility Subjected to Incoherent Seismic Waves Using the Random Vibration Theory
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DOI |
https://doi.org/10.4334/JKCI.2022.34.3.275 |
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Keywords |
비상관 지반운동; 불규칙진동이론; 추계학적 해석; 지진응답해석; 원자력 시설 incoherent seismic waves; random vibration theory; stochastic analysis; earthquake response analysis; nuclear facility |
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Abstract |
In this study, an earthquake response analysis for a nuclear facility with a rigid foundation is proposed based on the random-vibration-theory (RVT) methodology when the system is subjected to incoherent seismic waves. Using a coherency function of the seismic waves, the power spectral density (PSD) matrix for 6 degrees-of-freedom motions of the rigid foundation is calculated. The PSD function for pseudo-acceleration of an equipment, which is installed on one floor of the structure, is derived. The spectral acceleration or in-structure response spectrum (ISRS) of the equipment is estimated using a peak factor for a random motion. The proposed RVT methodology is applied to nuclear power plant structures to calculate ISRS when coherent seismic waves are applied to the system. The accuracy of the proposed approach is verified by comparing its results with those from the response-history methodology. It is demonstrated that incoherent seismic waves can reduce ISRS of structures at high frequencies.
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