Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Fragility Analysis of Equipment Considering the Inelastic Energy Absorption Factor of Weld Anchorage for Seismic Characteristics in Korea

국내 지진동 특성에 대한 기기 용접 정착부의 비탄성에너지 흡수계수를 고려한 지진취약도 평가

  • Eem, Seunghyun (Major in Plant System Engineering, Department of Convergence & Fusion System Engineering, Kyungpook National University) ;
  • Kim, Gungyu (Major in Plant System Engineering, Department of Convergence & Fusion System Engineering, Kyungpook National University) ;
  • Choi, In-Kil (Advanced Structures and Seismic Safety Research Division, Korea Atomic Energy Research Institute,) ;
  • Kwag, Shinyoung (Department of Civil & Environmental Engineering, Hanbat National University)
  • 임승현 (경북대학교 융복합시스템공학과 플랜트시스템전공) ;
  • 김건규 (경북대학교 융복합시스템공학과 플랜트시스템전공) ;
  • 최인길 (한국원자력연구원 첨단구조.지진안전연구부) ;
  • 곽신영 (한밭대학교 건설환경공학과)
  • Received : 2022.07.11
  • Accepted : 2022.11.02
  • Published : 2023.01.01
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Abstract

In Korea, most nuclear power plants were designed based on the design response spectrum of Regulatory Guide 1.60 of the NRC. However, in the case of earthquakes occurring in the country, the characteristics of seismic motions in Korea and the design response spectrum differed. The seismic motion in Korea had a higher spectral acceleration in the high-frequency range compared to the design response spectrum. The seismic capacity may be reduced when evaluating the seismic performance of the equipment with high-frequency earthquakes compared with what is evaluated by the design response spectrum for the equipment with a high natural frequency. Therefore, EPRI proposed the inelastic energy absorption factor for the equipment anchorage. In this study, the seismic performance of welding anchorage was evaluated by considering domestic seismic characteristics and EPRI's inelastic energy absorption factor. In order to reflect the characteristics of domestic earthquakes, the uniform hazard response spectrum (UHRS) of Uljin was used. Moreover, the seismic performance of the equipment was evaluated with a design response spectrum of R.G.1.60 and a uniform hazard response spectrum (UHRS) as seismic inputs. As a result, it was confirmed that the seismic performance of the weld anchorage could be increased when the inelastic energy absorption factor is used. Also, a comparative analysis was performed on the seismic capacity of the anchorage of equipment by the welding and the extended bolt.

Keywords

Acknowledgement

본 연구는 한국연구재단의 지원을 받아 수행한 연구과제입니다(No. 2020R1G1A1007570 & RS-2022-00154571).

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