Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Comparative Study on Seismic Fragility Curve Derivation Methods of Buried Pipeline Using Finite Element Analysis

유한요소 해석을 활용한 매설 배관의 지진 취약도 곡선 도출 기법 비교

  • Lee, Seungjun (Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology) ;
  • Yoon, Sungsik (Department of Artificial Intelligence, Hannam University) ;
  • Song, Hyeonsung (Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology) ;
  • Lee, Jinmi (Earthquake Hazards Reduction Center, National Disaster Management Research Institute) ;
  • Lee, Young-Joo (Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology)
  • 이승준 (울산과학기술원 도시환경공학과) ;
  • 윤성식 (한남대학교 AI융합학과) ;
  • 송현성 (울산과학기술원 도시환경공학과) ;
  • 이진미 (국립재난안전연구원) ;
  • 이영주 (울산과학기술원 도시환경공학과)
  • Received : 2023.07.17
  • Accepted : 2023.08.07
  • Published : 2023.09.01
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Abstract

Seismic fragility curves play a crucial role in assessing potential seismic losses and predicting structural damage caused by earthquakes. This study compares non-sampling-based methods of seismic fragility curve derivation, particularly the probabilistic seismic demand model (PSDM) and finite element reliability analysis (FERA), both of which require employing sophisticated finite element analysis to evaluate and predict structural damage caused by earthquakes. In this study, a three-dimensional finite element model of API 5L X65, a buried gas pipeline widely used in Korea, is constructed to derive seismic fragility curves. Its seismic vulnerability is assessed using nonlinear time-history analysis. PSDM and a FERA are employed to derive seismic fragility curves for comparison purposes, and the results are verified through a comparison with those from the Monte Carlo Simulation (MCS). It is observed that the fragility curves obtained from PSDM are relatively conservative, which is attributed to the assumption introduced to consider the uncertainty factors. In addition, this study provides a comprehensive comparison of seismic fragility curve derivation methods based on sophisticated finite element analysis, which may contribute to developing more accurate and efficient seismic fragility analysis.

Keywords

Acknowledgement

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

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