基于易损性分析的地铁车站抗震韧性评价方法

Seismic Resilience Assessment Method of Subway Station Based on Fragility Analysis

研究目的:地铁车站结构由于深埋于地下,一旦发生地震破坏,防灾救护、灾后修复将非常困难,而且将会造成巨大的经济损失以及人员伤亡。提高地铁车站的抗震韧性能力是可持续发展的重要保障。本文提出一种简单实用的地铁车站抗震韧性评价方法,用于评估不同场地条件下常见典型地铁车站的抗震韧性,为地铁车站的抗震韧性提升提供决策依据。研究结论:(1)本抗震韧性评价方法,不仅考虑了结构部分,还考虑了非结构构件,更为合理和真实;(2)本文提供的地铁车站结构抗震易损性曲线,分别考虑了地下两层单跨、两层双跨、两层三跨在Ⅰ、Ⅱ、Ⅲ类场地的情况,更为全面和实用;(3)随着地铁车站跨数的增加,不同损伤状态下的超越概率减小,车站趋于安全;随着地层从Ⅰ类场地降低到Ⅲ类场地,不同损伤状态下的超越概率变大,车站趋于危险;(4)本研究成果可以用于地铁车站的抗震韧性评估。

Research purposes:The structure of the subway station is buried deep underground,once it is damaged by an earthquake,disaster prevention,rescue,and post-disaster repair will be very difficult,and will cause huge economic losses and casualties.Improving the earthquake resilience of subway stations is an important guarantee for sustainable development.This paper aims to propose a simple and practical method for evaluating the seismic toughness of subway stations,which can be used to evaluate the seismic toughness of typical subway stations under different site conditions and provide a decision basis for improving the toughness of subway stations.Research conclusions:(1)The seismic toughness evaluation method not only considers the structural part but also considers the non-structural components,which is more reasonable and real.(2)The seismic vulnerability curves of subway station structures provided in this paper are more comprehensive and practical,considering the situations of underground two-storey single-span,two storey double-span,and two-storey triple-span in classⅠ,Ⅱ,andⅢsites,respectively.(3)With the increasing number of subway station spans,the overtaking probability decreases under different damage states,and the station tends to be safe;As the stratum decreases from the ClassⅠsite to the ClassⅢsite,the overrunning probability becomes larger under different damage states,and the station tends to be dangerous.(4)The results of this paper can be used to evaluate the seismic toughness of subway stations.