Unlike other facilities, maintaining processes is essential in industrial facilities. Pipe racks, which support pipes of various diameters, are important structures used in industrial facilities. Since the transport process of pipes directly affects the operation of industrial facilities, a fragility curve should be derived based on considering not only the pipe racks' structural safety but also the pipes' transport process. There are several studies where the fragility curves have been determined based on the structural behavior of pipe racks. However, few studies consider the damage criteria of pipes to ensure the transportation process, such as local buckling and tensile failure with surface defects. In this study, an analysis model of a typical straight pipe rack used in domestic industrial facilities is constructed, and incremental dynamic analysis using nonlinear response history analysis is performed to estimate the parameters of the fragility curve by the maximum likelihood estimation. In addition, the pipe rack's structural behavior and the pipe's damage criteria are considered the limit state for the fragility curve. The limit states considered in this paper to evaluate fragility curves are more reasonable to ensure the transportation process of the pipe systems.

1. 서 론
2. 지진취약도 한계상태
    2.1 파이프랙 손상기반 한계상태
    2.2 파이프 손상기반 한계상태
3. 해석 예제
    3.1 모델 검증
    3.2 직선형 파이프랙 해석 예제
4. 지진취약도
    4.1 입력지진파
    4.2 증분동적해석(Incremental Dynamic Analysis)
    4.3 최우도추정법
5. 결론 및 향후 연구
감사의 글

• 김주람(국민대학교 건설시스템공학부 석사과정) | Kim Juram (Graduate Student, Department of Civil Engineering, Kookmin University)
• 홍기증(국민대학교 건설시스템공학부 교수) | Hong Kee-Jeung (Professor, Department of Civil Engineering, Kookmin University) Corresponding author
• 황진하(한국건설생활환경시험연구원 광주전남센터 선임연구원) | Hwang Jin-Ha (Researcher, Gwangju & Jeonnam Center of Korea Conformity Laboratories)