基于数值统计的浅埋地下结构地震动强度指标与抗震性能水平划分研究  

Seismic Performance Levelsand Intensity Index of Shallow‑buried Underground Structure by Numerical Statistical Method

作　　者：王伟 杨靖 张广宇 庄海洋[1] WANG Wei;YANG Jing;ZHANG Guangyu;ZHUANG Haiyang(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009

出　　处：《防灾减灾工程学报》2023年第4期732-741,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金(51778290,51978333)资助。

摘　　要：现阶段地下结构易损性分析还处于初步研究阶段,以单层双跨的日本大开车站为原型,建立了土与单层地下结构动力相互作用的有限元模型。首先根据地震动的频率,选取地震动;再采用增量动力时程分析方法(IDA),给出了地下结构地震损伤状态的判定与定量划分方法,最后挑选出合适的地震强度指标(IM)。分析结果表明,基于PGA(地表峰值加速度)/PGV(地表峰值速度)分类的地震动记录在IDA曲线上表现出显著的差异,地震动选取的合理性以及随机性是地下结构地震易损性曲线客观性的重要保证;峰值地面加速度(PGA)与场地土层顶底峰值相对位移(PSSRD)均可作为该类浅埋矩形地下结构地震易损性分析的有效且合适的地震动强度指标。基于场地的非线性地震反应特征,对于深埋地下结构的地震动强度指标还有待进一步研究。The studies on the vulnerability analysis of underground structures are still in the preliminary stages.This paper uses the single-story double-span Daikai station in Japan as a prototype to establish a finite element model the investigate the dynamic interaction between soil and single-story underground structures.First,select the ground motion according to its frequency;then use the incremental dynamic analysis method(IDA)to give the determination and quantitative division method of the seismic damage state of the underground structure,finally select the suitable seismic intensity measure(IM).The results show that the ground motion records based on PGA(peak ground acceleration)/PGV(peak ground velocity)classification show significant differences on the IDA curve,thus,the rationality and randomness of ground motion selection are important guarantees for the objectivity of seismic vulnerability curve of underground structure.The peak ground acceleration(PGA)and the peak site surface relative displacement(PSSRD)can be used as an effective and suitable ground dynamometer for seismic vulnerable analysis of such shallow rectangular underground structures.For the deeply buried underground structure,the intensity index for its seismic performance should be studied further.

关 键 词：地铁地下车站结构 土‑结构相互作用 数值模拟 抗震性能水平 地震动强度指标 

分 类 号：TU352.4[建筑科学—结构工程] TU93