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| Influence of site homogeneity on the seismic fragility of shallow-buried subway station underground structures |
| JIANG Jiawei1，LI Wenbiao1，ZHAO Yazhi1，CHEN Guoxing1，DU Xiuli2 |
| 1.Institute of Geotechnical Engineering, Nanjing Tech.University, Nanjing 211816, China;
2.Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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Abstract Site condition is one of the key factors affecting the seismic response of underground structure. This paper is to study the influence of site homogeneity on the seismic fragility of subway station underground structure. Taking the two-story two-span subway station as the research object, a two-dimensional finite element analysis model considering soil-structure interaction was established based on the ABAQUS/standard software platform. IDA method was conducted to calculate the seismic response of the structure which located in the layered site and the homogeneous site respectively. The inter-story drift ratio is selected as the damage measure and PGA is selected as the earthquake intensity measure for building the seismic fragility curves of subway station structure. The results shown that the mean of the structure response of the layered site is significantly higher than that of the homogeneous site, while the standard deviation of the two site is identical. Under the excitation of the ground motion record, the failure probability of the structure located in the layered site is significantly higher than that of the homogeneous site, which is mainly due to the large shear deformation of the soil adjacent to structure in the layered site. The finding can provide a scientific reference for the performance-based seismic design of underground structures.
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Received: 30 May 2023
Published: 28 March 2024
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