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.

1. 서 론
2. 확률론적 지진 응답 모델(PSDM)
3. 유한요소 신뢰성 해석(FERA)
4. 수치 예제
    4.1 유한요소 모델
    4.2 확률변수 및 한계상태
    4.3 지진 취약도 곡선 도출
5. 결 론
감사의 글

• 이승준(울산과학기술원 도시환경공학과 석박사통합과정) | Lee Seungjun (Graduate Student, Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology)
• 윤성식(한남대학교 AI융합학과 조교수) | Yoon Sungsik (Assistant Professor, Department of Artificial Intelligence, Hannam University)
• 송현성(울산과학기술원 도시환경공학과 석박사통합과정) | Song Hyeonsung (Graduate Student, Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology)
• 이진미(국립재난안전연구원 연구원) | Lee Jinmi (Researcher, Earthquake Hazards Reduction Center, National Disaster Management Research Institute)
• 이영주(울산과학기술원 도시환경공학과 부교수) | Lee Young-Joo (Associate Professor, Department of Urban and Environment Engineering, Ulsan National Institute of Science and Technology) Corresponding author