Seismic Vulnerability Analysis Method for Longitudinal Response of Immersed Tunnels

被引：0
|
作者：
Yu H.-T. [1 ,2 ,3 ]
Li X.-X. [4 ]
Yuan Y. [1 ]
Ma C. [2 ]
机构：
[1] State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai
[2] Multi-functional Shaking Tables Laboratory, Beijing University of Civil Engineering and Architecture, Beijing
[3] Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Shaanxi, Xi'an
[4] Department of Geotechnical Engineering, Tongji University, Shanghai
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 10期
基金：
中国国家自然科学基金;
关键词：
immersed tunnel; incremental dynamic analysis; longitudinal seismic response; parametric analysis; seismic fragility; seismic performance; tunnel engineering;
D O I：
10.19721/j.cnki.1001-7372.2022.10.002
中图分类号：
学科分类号：
摘要：
The seismic design of immersed tunnels mainly concentrates on cross-sectional analyses, with only a limited number of studies considering longitudinal performance-based seismic design. This paper proposes a longitudinal seismic fragility analysis method and evaluation measures for immersed tunnels. First, the longitudinal seismic fragility analysis method was established by taking the characteristics and joints of immersed tunnels into consideration. The macroscopic beam model was used to simulate an immersed tunnel. The microscopic refinement model was used to capture the dynamic laws of the relative deformation of joints. The soil was simulated using nonlinear spring elements, and the equivalent linearization method was adopted to consider the dynamic nonlinear characteristics. In addition to the selected ground motion, intensity and damage measures were used that corresponded to the dynamic characteristics of the site. The seismic responses were modeled using the nonlinear incremental dynamic analysis procedure. Fragility curves were established at different limit states using an immersed tunnel as an application example. Parametric analyses were performed to investigate the influences of the length of a segment, direction of the earthquake excitation, and soil-structure relative stiffness ratio. The results showed that peak velocity at the tunnel position was the optimal intensity measure for the longitudinal seismic fragility analysis of an immersed tunnel. The seismic fragility was related to the wavelength of the earthquake excitation, and decreased when the length of a segment was similar to the wavelength. The seismic fragility decreased significantly with an increase in the angle between the input direction of earthquake excitation and the axial direction of the tunnel, with a 76% drop when the input direction was 90°. The seismic fragility decreased with an increase in the soil-structure relative stiffness ratio. The proposed method could provide a reference and basis for the seismic risk assessment of immersed tunnels. © 2022 Xi'an Highway University. All rights reserved.
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页码：13 / 22
页数：9
相关论文
共 32 条
  • [1] OWEN G N, SCHOLL R E., Earthquake engineering of large underground structures, (1981)
  • [2] YU Hai-tao, XIAO Wen-hao, YUAN Yong, Et al., Experiment on stiffness ratio of immersion joint to immersed tunnel element [J], China Journal of Highway and Transport, 29, 12, pp. 134-141, (2016)
  • [3] YUAN Yong, YU Hai-tao, YAN Xiao, Et al., Multi-point shaking table test simulation and analysis of a super-long immersed tunnel [J], China Journal of Highway and Transport, 29, 12, pp. 157-165, (2016)
  • [4] YU Hai-tao, XIAO Wen-hao, ZHAO Xu, Et al., Compression performance of flexible joints in immersed tunnels [J], China Journal of Highway and Transport, 32, 5, pp. 115-122, (2019)
  • [5] KIYOMIYA O., Earthquake-resistant design features of immersed tunnels in Japan, Tunnelling and Underground Space Technology, 10, 4, pp. 463-475, (1995)
  • [6] CHEN Gui-hong, Earthquake-resistant numeric analysis of immersed tunnels [D], (2002)
  • [7] CHENG Xin-jun, JING Li-ping, CUI Jie, Et al., Research of shaking table model tests on immersed tunnels under different conditions [J], Journal of Southwest Jiaotong University, 52, 6, pp. 1113-1120, (2017)
  • [8] YU Hai-tao, SONG Yi, LI Ya-dong, Et al., Multi-scale method and seismic response analysis of immersed tunnel [J], Journal of Tongji University (Natural Science), 49, 6, pp. 807-815, (2021)
  • [9] Seismic fragility formulation for water systems: Part 1-guidelines, (2001)
  • [10] AVANAKI M J, HOSEINI A, VAHDANI S, Et al., Seismic fragility curves for vulnerability assessment of steel fiber reinforced concrete segmental tunnel linings, Tunnelling and Underground Space Technology, 78, pp. 259-274, (2018)
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