다중 감쇠비 응답스펙트럼 추정을 위한 감쇠보정계수 제안

초록

Response spectra at various damping ratios are required for the seismic design of safety-related structures and equipment in nuclear power plants. Recent studies on damping correction factors have considered ground motion duration and earthquake magnitude, but the practical use is limited when such detail information is unavailable. This study quantifies the damping- and frequency-dependent characteristics of response spectra using recorded ground motions and proposes a damping correction factor for estimating multi-damping response spectra from a 5%-damped spectrum without detail information. The proposed equation shows high goodness-of-fit to mean damping correction factor data and stable performance in repeated holdout validation, while reflecting frequency dependence and high-frequency convergence not adequately considered in domestic and international design standards. The results can be used as physics-based prior information for future machine-learning-based prediction of floor response spectra.

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