Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Evaluation of seismic fragility models for cut-and-cover railway tunnels

개착식 철도 터널 구조물의 기존 지진취약도 모델 적합성 평가

  • Yang, Seunghoon (Dept. of Civil, Environmental and System Engineering, Hanyang University) ;
  • Kwak, Dongyoup (Dept. of Civil and Environmental Engineering, Hanyang University ERICA)
  • 양승훈 (한양대학교 건설환경시스템공학과) ;
  • 곽동엽 (한양대학교 ERICA 건설환경공학과)
  • Received : 2021.09.03
  • Accepted : 2021.12.22
  • Published : 2022.01.31
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Abstract

A weighted linear combination of seismic fragility models previously developed for cut-and-cover railway tunnels was presented and the appropriateness of the combined model was evaluated. The seismic fragility function is expressed in the form of a cumulative probability function of the lognormal distribution based on the peak ground acceleration. The model uncertainty can be reduced by combining models independently developed. Equal weight is applied to four models. The new seismic fragility function was developed for each damage level by determining the median and standard deviation, which are model metrics. Comparing fragility curves developed for other bored tunnels, cut-and-cover tunnels for high-speed railway system have a similar level of fragility. We postulated that this is due to the high seismic design standard for high-speed railway tunnel.

본 연구에서는 기존에 개발된 개착식 철도 터널의 지진취약도 모델들을 가중 조합하여 새로운 모델을 제시하고 제시한 모델의 적정성을 평가하였다. 지진취약도 함수의 형태는 최대지반가속도의 대수정규분포형태로, 누적확률분포로 표현된다. 독립적으로 개발된 각 모델을 선형 가중 조합하는 것으로 모델의 불확실성을 줄일 수 있기에 4개의 모델에 대하여 25%씩 동등하게 선형가중을 부여하였다. 조합된 지진취약도 곡선에 최대 지반가속도에 대한 피해발생확률을 이용하여 지진취약도 곡선의 중앙값과 표준편차를 결정하여 새로운 지진취약도 함수를 개발하였다. 개발된 지진취약도 함수의 적합성을 평가하기 위하여 다양한 터널의 지진취약도 곡선과 비교 분석을 진행하였다. 개발된 곡선은 상대적으로 지진피해에 안전한 굴착식 터널의 지진취약도 함수와 비슷한 취약도를 갖는 것으로 나타나는데, 대상 터널은 국내 고속철도 개착식 터널로 높은 내진설계 기준에 의해 기인하는 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 국토교통부 국토교통기술촉진연구사업의 연구비지원(과제번호 21CTAP-C152247-02)에 의해 수행되었습니다. 이에 깊은 감사를 드립니다.

References

  1. ALA (American Lifelines Alliance) (2001), Seismic fragility formulations for water systems: Part 1 - Guideline, ASCE-FEMA, Reston, VA2001, pp. 85-89.
  2. Andreotti, G., Lai, C.G. (2019), "Use of fragility curves to assess the seismic vulnerability in the risk analysis of mountain tunnels", Tunnelling and Underground Space Technology, Vol. 91, pp. 103008. https://doi.org/10.1016/j.tust.2019.103008
  3. Argyroudis, S., Kaynia, A.M. (2015), "Analytical seismic fragility functions for highway and railway embankments and cuts", Earthquake Engineering & Structural Dynamics, Vol. 44, No. 11, pp. 1863-1879. https://doi.org/10.1002/eqe.2563
  4. Argyroudis, S.A., Pitilakis, K.D. (2012), "Seismic fragility curves of shallow tunnels in alluvial deposits", Soil Dynamics and Earthquake Engineering, Vol. 35, pp. 1-12. https://doi.org/10.1016/j.soildyn.2011.11.004
  5. Avanaki, M.J., Hoseini, A., Vahdani, S., de Santos, C., de la Fuente, A. (2018), "Seismic fragility curves for vulnerability assessment of steel fiber reinforced concrete segmental tunnel linings", Tunnelling and Underground Space Technology, Vol. 78, pp. 259-274. https://doi.org/10.1016/j.tust.2018.04.032
  6. FEMA (Federal Emergency Management Agency) (2020), HAZUS-MH technical manual, pp. 7-1-27.
  7. Hu, X., Zhou, Z., Chen, H., Ren, Y. (2020), "Seismic fragility analysis of tunnels with different buried depths in a soft soil", Sustainability, Vol. 12, No. 3, pp. 892. https://doi.org/10.3390/su12030892
  8. Huh, J.W., Le, T.S., Kang, C.H., Kwak, K.S., Park, I.J. (2017), "A probabilistic fragility evaluation method of a RC box tunnel subjected to earthquake loadings", Journal of Korean Tunnelling and Underground Space Association, Vol. 19, No. 2, pp. 143-159. https://doi.org/10.9711/KTAJ.2017.19.2.143
  9. Iai, S. (2005), "International standard (ISO) on seismic actions for designing geotechnical works - an overview", Soil Dynamics and Earthquake Engineering, Vol. 25, pp. 605-615. https://doi.org/10.1016/j.soildyn.2004.11.005
  10. Kim, G.W., Song, J.G., Lee, C.H. (2006), "Lateral load distribution factor for pushover analysis including higher mode effects", Journal of the Korea Institute for Structural Maintenance and Inspection, Vol. 10, No. 3, pp. 203-210.
  11. Kim, H.K., Shin, C.S., Lee, T.H., Lee, J.G., Park, D.H. (2014), "A study on the development of the seismic fragility functions of the high speed railway tunnels in use", Journal of the Korean Geoenvironmental Society, Vol. 15, No. 11, pp. 67-75. https://doi.org/10.14481/JKGES.2014.15.11.67
  12. Kwak, D.Y., Seyhan, E., Kishida, T. (2018), "A method of linear combination of multiple models for epistemic uncertainty minimization", Proceedings of the Eleventh US National Conference on Earthquake Engineering, Los Angeles, California, pp. 1-10.
  13. Kyung, J.B., Kim, M.J., Lee, S.J., Kim, J.K. (2016), "An analysis of probabilistic seismic hazard in the Korean Peninsula - probabilistic peak ground acceleration (PGA)", Journal of the Korean Earth Science Society, Vol. 37, No. 1, pp. 52-61. https://doi.org/10.5467/JKESS.2016.37.1.52
  14. Lee, T.H., Park, D.H., Nguyen, D.D., Park, J.S. (2016), "Damage analysis of cut-and-cover tunnel structures under seismic loading", Bulletin of Earthquake Engineering, Vol. 14, No. 2, pp. 413-431. https://doi.org/10.1007/s10518-015-9835-x
  15. MLTM (Ministry of Land, Transport and Maritime Affairs) (2009), Earthquake resistance design regulations for subway structures, pp. 60.
  16. Nguyen, D.D., Park, D.H., Shamsher, S., Nguyen, V.Q., Lee, T.H. (2019), "Seismic vulnerability assessment of rectangular cut-and-cover subway tunnels", Tunnelling and Underground Space Technology, Vol. 86, pp. 247-261. https://doi.org/10.1016/j.tust.2019.01.021
  17. Park, D.H., Nguyen, D.D., Lee, T.H., Nguyen, V.Q. (2018), "Seismic fragility evaluation of cut-and-cover tunnel", Journal of the Korean Geotechnical Society, Vol. 34, No. 11, pp. 71-80. https://doi.org/10.7843/KGS.2018.34.11.71
  18. Park, S.Y., Yoon, H.J., Oh, Y.S., Sin, Y.S. (2006), "A case study of damages on tunnel structure due to chuetsu earthquake", Proceedings of the KSR (Korean Society for Railway) Conference, Daejeon, pp. 478-492.
  19. Shinozuka, M., Feng, M.Q., Lee, J.H., Naganuma, T. (2000), "Statistical analysis of fragility curves", Journal of Engineering Mechanics, Vol. 126, No. 12, pp. 1224-1231. https://doi.org/10.1061/(ASCE)0733-9399(2000)126:12(1224)