Seismic Fragility of Sewage Pipes Considering Site Response in Korean, Seoul Site

국내 서울지역의 부지응답해석을 고려한 하수도관의 지진취약도

  • Shin, Dea-Sub (Department of Civil Engineering, University of Seoul) ;
  • Kim, Hu-Seung (Department of Civil Engineering, University of Seoul)
  • 신대섭 (서울시립대학교 토목공학과) ;
  • 김후승 (서울시립대학교 토목공학과)
  • Received : 2017.04.21
  • Accepted : 2017.07.07
  • Published : 2017.07.31


The number of damaged lifeline structures have been increasing with urban acceleration under earthquakes. To predict the damage, damage mitigation technology of lifeline structures should be analyzed using damage prediction technology. Therefore, in this paper, the degree of the fragility of structures under an earthquake was evaluated stochastically through an evaluation of the seismic fragility. The aim was to develop damage prediction technology of sewage pipes among the lifeline facilities. The site response was performed using the data from 158 boreholes in Seoul and 7 real earthquake waves to determine the responses in real urban areas. The seismic fragility was deduced through a total of 29822 time history analysis. In addition, sewer pipes were evaluated and the persisting period was passed by applying the research results of strength reduction which is due to sulphate erosion. As a result, the difference in failure probability between 300 and 800 with the smaller diameter of the representative pipes was approximately double and the size of the pipes has a significant effect on the seismic fragility function. Moreover, the failure probability of a seismic load increases by up to 10 fold as the strength reduction rate increases. The results of this study can be used as a means of predicting the damage and countermeasures of sewer pipes and might be reflected in the seismic design of underground facilities.


Lifeline Structures;Seismic Fragility;Site Responses;Sewer Pipes;Urban Area


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