Seismic vulnerability assessment of multi-storey subway station structure

Tong Liu,Zhixin Li,Qinghe Wang,Huaiyu Xu,A Caggiano

doi:10.1051/e3sconf/202129302030

Abstract

The safety of underground structure under seismic load is an important basis of the normal operation of underground rail transit system. Structural seismic vulnerability assessment based on incremental dynamic analysis method can evaluate the probability of the structure exceeding a certain limit state under a specific seismic intensity in terms of probability. In this paper, the seismic vulnerability of a multi-storey subway station structure is evaluated using this method, and a two-dimensional finite element model of both soil and structure is established by finite element software ABAQUS. The vulnerability curve is obtained through incremental dynamic analysis and mathematical statistics. Based on this curve, the probabilities of the structure exceeding four seismic limit states are obtained under the design seismic intensity and the rarely occurred seismic intensity at 7 degree. Results show that this station may attain slight damage under design seismic intensity of 7 degree, and may attain life safety at the rarely occurred seismic intensity at 7 degree.

Highlights

The researchers generally agree that the seismic performance of underground structure is better than that of the surface structure
Among the approaches of evaluating seismic performance, seismic vulnerability assessment based on incremental dynamic analysis(IDA) can evaluate the probability of the structure exceeding a certain limit state under a specific seismic intensity in terms of probability[3,4]
Seismic vulnerability assessment means calculate the probability of structural dynamic response exceeding a certain limit state intensity levels, i.e

Summary

Introduction

The researchers generally agree that the seismic performance of underground structure is better than that of the surface structure. The Daikai subway station encountered M type failure mode during the Kobe earthquake at Japan in 1995[1,2]. With the continuous development of science and technology, underground space is fully exploited and the layer of underground subway station structure increases. It is necessary to do research on the seismic performance of multi-storey underground subway station. The method can fully take the randomness of seismic ground motion and structural dynamic response characteristics under strong earthquake into consideration. This method has been applied to the seismic vulnerability assessment of conventional underground structures[5,6]

Methods

Results

Conclusion