基于IDA方法的综合管廊纵向地震易损性分析研究  

Longitudinal seismic fragility analysis of utility tunnel structures based on IDA method

作　　者：李锦强 钟紫蓝 申家旭 张卜 张亚波 杜修力[1] LI Jinqiang;ZHONG Zilan;SHEN Jiaxu;ZHANG Bu;ZHANG Yabo;DU Xiuli(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《岩土工程学报》2024年第8期1622-1631,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52378470,51978020);中国博士后科学基金项目(2021M700311);国家重点研发计划项目(2022YFC3003603)。

摘　　要：为了提出一种基于非线性增量动力分析(incremental dynamic analysis,IDA)的长线型综合管廊纵向地震性能评价的易损性分析方法,以单舱综合管廊为研究对象建立了简化梁-弹簧模型,合理地考虑了管廊接口的力学性能和管廊-土相互作用,将筛选的17组地震动统一调幅至不同强度水平后作为输入开展一维自由场分析以获取管廊底板位置处的地震动时程,最后开展了考虑地震动行波效应的综合管廊地震响应分析。基于IDA分析结果对地震动强度指标进行优选,最终建立了以管廊底板位置处峰值速度和地表峰值速度为地震动强度指标,以管廊接口张开量为损伤指标的易损性曲线,得到了不同地震烈度水平下综合管廊的失效概率。给出的典型II类场地中管廊地震易损性曲线和失效概率可以作为评价该类地下结构抗震性能的有效工具,为长线型综合管廊在不同地震动强度下的损伤预测提供可靠依据。This study aims to propose a fragility analysis method for evaluating the longitudinal seismic performance of long-line utility tunnels based on nonlinear incremental dynamic analysis(IDA).To this end,a simplified beam-spring model is established,to reasonably consider the mechanical properties of the joint and the soil-tunnel interaction.A series of 17 sets of ground motion records are selected and uniformly scaled to different intensity levels as the input of one-dimension free filed analyses to obtain the ground motions at the bottom slab of a utility tunnel.Finally,the seismic analysis of the utility tunnel considering wave passage effects is conducted.Based on the IDA results,the optimal intensity measure is selected.With the damage measure of the peak joint opening,the fragility curves of the utility tunnel are established using the peak velocity at the bottom slab of the tunnel and the peak velocity at the ground surface as the intensity measures,respectively.The failure probability of the utility tunnel under different earthquake intensity levels is also obtained.The proposed fragility curves and failure probability of the utility tunnel in typical site II can provide an effective tool to estimate the seismic performance of this type of underground structures and a reliable basis for predicting damage under different earthquake intensity levels.

关 键 词：综合管廊 梁-弹簧模型 增量动力分析 易损性分析 失效概率 

分 类 号：TU435[建筑科学—岩土工程] TU990.3[建筑科学—土工工程]