Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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A Study of the Relationship Between Number of Ground Motions and Parameters of Seismic Fragility Curve

지진취약도 곡선 생성시 선택된 지진파 수에 따른 입력변수 변화에 관한 연구

  • Park, Sangki (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Ki-Tae (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Jaehwan (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jung, Kyu-San (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Seo, Dong-Woo (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 박상기 (한국건설기술연구원 구조연구본부) ;
  • 박기태 (한국건설기술연구원 구조연구본부) ;
  • 김재환 (한국건설기술연구원 구조연구본부) ;
  • 정규산 (한국건설기술연구원 구조연구본부) ;
  • 서동우 (한국건설기술연구원 구조연구본부)
  • Received : 2024.07.01
  • Accepted : 2024.07.22
  • Published : 2024.09.01
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Abstract

Seismic fragility curves present the conditional probability of damage to target structures due to external seismic load and are widely used in various ways. When constructing such a seismic fragility curve, it is essential to consider various types and numbers of ground motions. In general, the earthquake occurrence characteristics of an area where the target structure of the seismic fragility curve exists are analyzed, and based on this, appropriate ground motions are selected to derive the seismic fragility curve. If the number of selected ground motions is large, the diversity of ground motions is considered, but a large amount of computational time is required. Conversely, if the number of ground motions is too small, the diversity of ground motions cannot be considered, which may distort the seismic fragility curve. Therefore, this study analyzed the relationship between the number of ground motions considered when deriving the seismic fragility curve and the parameters of the seismic fragility curve. Using two example structures, numerical analysis was performed by selecting a random number of ground motions from a total of two hundred, and a seismic fragility curve was derived based on the results. Analysis of the relationship of the parameter of the seismic fragility curve and the number of selected ground motions was performed. As the number of ground motions considered increases, uncertainty in ground motion selection decreases, and when deriving seismic fragility curves considering the same number of ground motions, uncertainty increases relatively as the degree of freedom of the target structure increases. However, considering a relatively large number of ground motions, uncertainty appeared insignificant regardless of increased degrees of freedom. Finally, it is possible that the increase in the number of ground motions could lower the epistemic uncertainty and thus improve the reliability of the results.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부 한국건설기술연구원 연구운영비지원(주요사업)사업으로 수행되었습니다(과제번호20240142-001, DNA 기반 노후 교량 구조물 스마트 유지관리 플랫폼 및 활용기술 개발).

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