基于IDA分析法的公路隧道衬砌抗震性能分析

为合理评估地震作用下公路隧道衬砌损伤程度,以实际隧道震害资料及现有隧道损伤评价方法为基础,给出隧道衬砌性能指标并建立隧道衬砌损伤评价体系,采用IDA分析法全面讨论不同地震作用及地震动强度参数对于隧道衬砌地震响应的影响规律,通过易损性理论分析隧道衬砌在不同强度地震作用下超越不同性能水准的概率。结果表明:当设防烈度为6度时,小震作用下隧道损伤超越4个性能水准的概率均为0;中震作用下隧道损伤超越性能水准Ⅰ的概率为30.12%;大震作用下隧道损伤超越性能水准Ⅱ的概率为36.56%。IDA分析法作为一种有效的分析方法,能够较好地评估公路隧道衬砌的抗震性能。

Seismic Performance Analysis of Highway Tunnel Lining Based on IDA

In order to reasonably evaluate the damage degree of highway tunnel lining under earthquake, the tunnel lining damage evaluation system is established and tunnel performance indexes are given based on the actual tunnel damage and existing tunnel damage evaluation method. The influence of different seismic action and ground motion intensity parameters on the tunnel lining seismic response is discussed comprehensively with IDA. According to the theory of vulnerability, the exceeding probability at different performance level is analyzed with IDA. The results show that when the seismic precautionary intensity is 6 degree, the probability of the tunnel damage exceeding the four performance levels under the small earthquake is 0;the probability of the tunnel damage exceeding the performance level I under the medium earthquake is 30.12%;the probability of tunnel damage exceeding performance level II under the action of large earthquake is 36.56%. As an effective analysis method, IDA analysis could evaluate effectively seismic performance of highway tunnel lining.