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http://dx.doi.org/10.5000/EESK.2021.25.6.261

Seismic Fragility Analysis Considering the Inelastic Behavior of Equipment Anchorages for High-Frequency Earthquakes  

Eem, Seunghyun (Major in Plant System Engineering, Department of Convergence & Fusion System Engineering, Kyungpook National University)
Kwag, Shinyoung (Department of Civil & Environmental Engineering, Hanbat National University)
Choi, In-Kil (Advanced Structures and Seismic Safety Research Division, Korea Atomic Energy Research Institute)
Jung, Jae-Wook (Advanced Structures and Seismic Safety Research Division, Korea Atomic Energy Research Institute)
Kim, Seokchul (Central Research Institute, Korea Hydro & Nuclear Power)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.25, no.6, 2021 , pp. 261-266 More about this Journal
Abstract
Nuclear power plants in Korea were designed and evaluated based on the NRC's Regulatory Guide 1.60, a design response spectrum for nuclear power plants. However, it can be seen that the seismic motion characteristics are different when analyzing the Gyeongju earthquake and the Pohang earthquake that has recently occurred in Korea. Compared to the design response spectrum, seismic motion characteristics in Korea have a larger spectral acceleration in the high-frequency region. Therefore, in the case of equipment with a high natural frequency installed in a nuclear power plant, seismic performance may be reduced by reflecting the characteristics of domestic seismic motions. The failure modes of the equipment are typically structural failure and functional failure, with an anchorage failure being a representative type of structural failure. In this study, comparative analyses were performed to decide whether to consider the inelastic behavior of the anchorage or not. As a result, it was confirmed that the seismic performance of the anchorages could be increased by considering the inelastic behavior of an anchorage.
Keywords
Anchorage; High frequency earthquake; Inelastic energy absorption factor; Seismic performance; Seismic Fragility; Seismic risk;
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  • Reference
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