隧道纵向地震易损性分析  

Seismic Vulnerability Analysis in the Longitudinal Direction of a Tunnel

作　　者：赵旭[1] 杨宇杰 黄景琦 曹胜涛 Zhao Xu;Yang Yujie;Huang Jingqi;Cao Shengtao(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Guangzhou Yingli Technology Co.,Ltd.,Guangzhou 510700,China)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]北京科技大学土木与资源工程学院,北京100083 [3]广州颖力科技有限公司,广东广州510700

出　　处：《市政技术》2024年第6期37-45,共9页Journal of Municipal Technology

基　　金：国家自然科学基金面上项目(41672289)。

摘　　要：为研究隧道纵向抗震性能,使用改进的地基梁-弹簧非线性分析模型计算隧道纵向地震响应,其中采用PQ-Fiber纤维梁模型模拟隧道纵向的非线性行为,并施加弯矩来考虑隧道与场地之间的切向相互作用。随后,将基于增量动力分析(IDA)方法的结构地震易损性分析方法应用于隧道结构,探究适用于隧道结构的地震动强度指标(IM)。选取12条近场地震记录,用于IDA分析隧道纵向的抗震性能水平。将概率地震需求模型与工程需求参数相结合,建立结构的地震易损性曲线。结果表明,峰值速度(PGV)是适用于隧道纵向抗震性能的地震动强度指标;场地类型对隧道纵向损伤程度的影响最为深远,其中Ⅰ类场地在地震作用下损伤概率最大。此外,将计算所得易损性曲线与经验易损性曲线和横向易损性曲线进行对比分析,验证了模型的可行性,为隧道结构的抗震设计提供了一定的参考。To examine the longitudinal seismic resilience of tunnels,the seismic response of the tunnel in the longitudinal direction is calculated using an improved nonlinear beam-spring model,where the PQ-fiber beam model is employed to simulate the nonlinear behavior in the longitudinal direction of the tunnel,and the torsional moment is considered to account for the tangential interaction between the tunnel and the soil.Subsequently,the Incremental Dynamic Analysis(IDA)method for seismic vulnerability analysis is applied to tunnel structures,and the suitable seismic intensity measure(IM)for tunnel structures is studied.Twelve near-field seismic motion records are selected for IDA analysis of the seismic performance level of the tunnel’s longitudinal direction.The probability seismic demand models are combined with engineering demand parameters to establish the seismic vulnerability curves for the structure.The results indicate that Peak Ground Velocity(PGV)is a suitable seismic intensity measure for the longitudinal seismic performance of tunnels.The impact of site type has the most profound effect on the extent of damage in the tunnel’s longitudinal direction,with Type I sites showing the highest probability of damage under seismic action.Furthermore,a comparison analysis is conducted between the calculated vulnerability curves and existing empirical vulnerability curves and numerical vulnerability curves,demonstrating the feasibility of the results and providing valuable insights for seismic design of tunnel structures.

关 键 词：圆形隧道 纵向抗震性能 地震动强度指标 增量动力分析 易损性曲线 

分 类 号：U451[建筑科学—桥梁与隧道工程]