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J. Korean Soc. Hazard Mitig. > Volume 18(7); 2018 > Article
시설물방재
Journal of the Korean Society of Hazard Mitigation 2018;18(7):315-321.
DOI: https://doi.org/10.9798/KOSHAM.2018.18.7.315    Published online December 31, 2018.
근거리지진의 영향을 고려한 면진 원전구조물의 지진취약도
두이-두안 응웬1, 비덱 투사2, 이태형3
1정회원, 건국대학교 인프라시스템공학과 박사과정
2건국대학교 인프라시스템공학과 석사과정
3정회원, 건국대학교 사회환경공학부 교수
Seismic Fragility of Base-Isolated Nuclear Power Plant Considering Effects of Near-Fault Ground Motions
Duy-Duan Nguyen1, Bidhek Thusa2, Tae-Hyung Lee3
1Member, Ph.D. Candidate, Department of Civil Engineering, Konkuk University
2Graduate Student, Department of Civil Engineering, Konkuk University
3Member, Professor, Department of Civil and Environmental Engineering, Konkuk University
Corresponding author:  Tae-Hyung Lee, Tel: +82-2-450-4093, Fax: +82-2-450-4093, 
Email: thlee@konkuk.ac.kr
Received: 25 October 2018   • Revised: 30 October 2018   • Accepted: 5 November 2018
Abstract
This study investigates the effect of near-fault ground motions on the seismic fragility of base-isolated nuclear power plant (NPP) structures. Because near-fault motion has either directivity or a so-called fling-step characteristic, or both, three groups of ground motions, namely, near-fault forward-directivity, near-fault fling-step, and far-fault ground motions, are selected for fragility analyses. A base-isolated advanced power reactor 1400 (APR1400), a recently developed NPP in Korea, is employed for numerical analysis. A set of fragility curves are derived for various limit states based on the maximum likelihood estimation. The limit states are defined in terms of deformation capacity of lead rubber bearing (LRB). The numerical results reveal that the median maximum deformations of LRBs were smaller for far-fault ground motions than for near-fault ground motions. In addition, the comparison of fragility curves demonstrates that the probability of failure of base-isolated NPP structures is higher for near-fault ground motions than for far-fault motions given the same earthquake intensity.
Key Words: Nuclear Power Plant, Near-fault Ground Motion, Forward-directivity, Fling-step, Base Isolation
요지
근거리지진은 방향효과(forward-directivity effect)와 플링스텝(fling-step)이라고 부르는 영구지반변형을 유발하는 특징이 있다. 본 논문에서는 근거리지진의 영향을 고려하여 면진된 원자력발전소 구조물의 지진취약도를 평가하였다. 다양한 지진기록을 수집하여 방향효과를 포함한 근거리지진, 플링스텝을 포함한 근거리지진, 원거리지진의 세 그룹으로 분류하였다. 한국형 신형 가압경수로인 APR1400을 수치해석을 위한 대상으로 선정하였다. 지진취약도 곡선은 최우도추정법을 이용하여 도출하였으 며, 여기에는 면진장치인 납-고무받침(LRB)의 변형능력을 한계상태로 고려하였다. 해석결과, 원거리지진을 고려했을 때 LRB 최대변형의 중간값이 근거리지진을 고려한 경우보다 작았다. 또한, 동일한 지진강도에 대해서 근거리지진이 원거리지진보다 원전구조물을 손상시킬 확률이 높게 계산되었다.
핵심용어: 원자력발전소, 근거리지진, 방향효과, 플링스텝, 면진
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