Seismic Fragility Analysis of Shallow-Buried Subway Station Structure in Loess Strata

SUN Weiyu; ZHU Hui; YAN Songhong; LIANG Qingguo; ZHANG Jianzhe; YANG Bin; ZHANG Rongling

doi:10.3969/j.issn.0258-2724.20230597

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Journal of Southwest Jiaotong University > 2025 > Accepted Manuscript

SUN Weiyu, ZHU Hui, YAN Songhong, LIANG Qingguo, ZHANG Jianzhe, YANG Bin, ZHANG Rongling. Seismic Fragility Analysis of Shallow-Buried Subway Station Structure in Loess Strata[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230597

Citation:

SUN Weiyu, ZHU Hui, YAN Songhong, LIANG Qingguo, ZHANG Jianzhe, YANG Bin, ZHANG Rongling. Seismic Fragility Analysis of Shallow-Buried Subway Station Structure in Loess Strata[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230597

Citation:

SUN Weiyu, ZHU Hui, YAN Songhong, LIANG Qingguo, ZHANG Jianzhe, YANG Bin, ZHANG Rongling. Seismic Fragility Analysis of Shallow-Buried Subway Station Structure in Loess Strata[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230597

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Seismic Fragility Analysis of Shallow-Buried Subway Station Structure in Loess Strata

doi: 10.3969/j.issn.0258-2724.20230597

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070, China
3.
China Railway Construction Management Co., Ltd., Beijing 100161, China

Received Date: 09 Nov 2023
Rev Recd Date: 19 Jan 2024

Available Online: 23 Jan 2025

Abstract

Abstract

In order to study the seismic fragility of subway stations situated in loess sites, a typical two-story three-span subway station structure in a loess area was chosen as a representative example, and incremental dynamic analysis (IDA) was conducted on the subway station structure by using the ground motion input method based on viscoelastic boundaries. The results of IDA were then used to comprehensively evaluate 37 seismic intensity indices in terms of their effectiveness, practicality, and benefit. Based on this evaluation, seismic intensity indices that were suitable for the site conditions and structural configuration of the subway station were selected. Seismic fragility curves and damage state probability curves for the subway station structure were established using a double-parameter lognormal distribution model. These curves facilitated the determination of the probability of the subway station structure exceeding various performance levels and encountering different damage states under specific seismic intensities. The findings suggest that acceleration-related and velocity-related indices are more suitable as seismic intensity indices for predicting the seismic response of underground structures, while displacement-related and ratio-related indices are not appropriate. Under frequent seismic events, the probability of the subway station structure experiencing damage is relatively low. For design-level seismic events, the structure primarily sustains slight damage. In the case of rare seismic events, the subway station structure is more prone to slight and moderate damage. The results provide a reference for the seismic design of performance-based subway stations constructed on loess strata.
- subway station,
- seismic performance,
- seismic intensity parameter,
- incremental dynamic analysis,
- fragility analysis

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