Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Seismic Fragility Analysis of Single-Degree-of-Freedom Model Based on Input Earthquake Ground Motions in Strong and Low-to-Moderate Seismic Regions

강진 및 중·약진 지역의 입력 지진파에 따른 단자유도 모델의 지진취약도 분석

  • Sangki Park (Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology) ;
  • Jeong-Rae Cho (Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology) ;
  • Chang-Beck Cho (Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology) ;
  • Dong-Chan Kim (Department of Geotechnical Engineering, Korea Institute of Civil Engineering and Building Technology) ;
  • Jinhyuk Lee (Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology)
  • 박상기 (한국건설기술연구원 구조연구본부) ;
  • 조정래 (한국건설기술연구원 구조연구본부) ;
  • 조창백 (한국건설기술연구원 구조연구본부) ;
  • 김동찬 (한국건설기술연구원 지반연구본부) ;
  • 이진혁 (한국건설기술연구원 구조연구본부)
  • Received : 2023.09.27
  • Accepted : 2023.10.16
  • Published : 2023.12.31
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Abstract

To calculate seismic fragility, it is important to select input earthquake ground motions that can properly express the characteristics of the target site. This study analyzed the seismic fragility of a single-degree-of-freedom (SDOF) model based on input earthquake ground motions in strong and low-to-moderate seismic regions. As a first step, a total of four sets of input earthquake ground motions were selected,: two sets measured near or far from overseas strong earthquake records and two sets exhibiting the characteristics of low-to-moderate earthquake regions in South Korea. A nonlinear SDOF model for three natural periods was applied to the target structure, and incremental dynamic analysis was used for fragility analysis. In addition, four damage states were defined, and seismic fragility results for each natural period of the nonlinear SDOF model for the four aforementioned input earthquake ground motion sets were obtained for each damage state.

지진취약도를 산정하기 위해서는 목표 부지의 특성을 제대로 표현할 수 있는 입력 지진파의 산정이 중요하다. 본 논문에서는 국내외 강진 및 중‧약진 지역에서의 입력 지진파에 대한 단자유도 모델의 지진취약도를 분석하였다. 분석을 위한 첫 번째 단계로, 국외 강진 기록 중 근/원거리에서 측정한 2개의 입력 지진파 세트와 국내 중·약진 지역 특성에 적합한 입력 지진파 2개의 세트, 총 4개의 입력 지진파 세트를 선정하였다. 대상 구조물로는 3가지 고유주기에 대한 비선형 단자유도 모델을 적용하였고, 취약도 분석을 위해 증분동적해석을 이용하였다. 또한, 4가지 손상 상태를 정의하고, 손상 상태 각각에 대해 4가지 입력 지진파 세트의 고유주기별 지진취약도 결과를 제시하였다.

Keywords

Acknowledgement

본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음(과제번호 RS-2021-KA163162).

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