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2023 Vol.36, Issue 6 Preview Page

Research Paper

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 Park1
,
Jeong-Rae Cho2
,
Chang-Beck Cho1
,
Dong-Chan Kim3
,
Jinhyuk Lee4*
박 상기1
,
조 정래2
,
조 창백1
,
김 동찬3
,
이 진혁4*
1Senior Researcher, Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, Korea
2Senior Research Fellow, Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, Korea
3Postdoctoral Researcher, Department of Geotechnical Engineering, Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, Korea
4Postdoctoral Researcher, Department of Structural Engineering, Korea Institute of Civil Engineering and Building Technology, Goyang, 10223, Korea
1한국건설기술연구원 구조연구본부 수석연구원
2한국건설기술연구원 구조연구본부 선임연구위원
3한국건설기술연구원 지반연구본부 박사후연구원
4한국건설기술연구원 구조연구본부 박사후연구원
*Corresponding Author
31 December 2023. pp. 371-380
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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.

Keywords
seismic fragility
input earthquake ground motions
natural period
damage state
incremental dynamic analysis

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.

키워드
지진취약도
입력 지진파
고유주기
손상 상태
증분동적해석
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 36
  • No :6
  • Pages :371-380
  • Received Date : 2023-09-27
  • Revised Date : 2023-10-16
  • Accepted Date : 2023-10-16
  • DOI :https://doi.org/10.7734/COSEIK.2023.36.6.371
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