基于耐震时程法的地下结构序列地震作用抗震性能研究  

Aseismic performance of underground structure under mainshock-aftershock sequences based on endurance time analysis

作　　者：王国波 王鸿杰 王建宁 金立国 赵丁凤 WANG Guobo;WANG Hongjie;WANG Jianning;JIN Liguo;ZHAO Dingfeng(College of Civil Engineering and Architectural,Wenzhou University,Wenzhou 325035,China;China National Machinery Industry Group Co.,Ltd.,Beijing 100080,China;Institute of Geology,China Earthquake Administration(CEA),Beijing 100029,China;Shanghai Waterway Engineering Design and Consulting Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]温州大学建筑工程学院,浙江温州325035 [2]中国机械工业集团有限公司,北京100080 [3]中国地震局地质研究所,北京100029 [4]中交上海航道勘察设计研究院有限公司,上海200120

出　　处：《振动与冲击》2024年第15期261-268,276,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52308496,52078386);国机集团青年科技基金培育项目(QNJJ-PY-2022-02);北京市青年人才托举工程(BYESS2023432)。

摘　　要：针对当前地铁地下结构抗震性能研究大多仅考虑主震影响而忽略地震后可能伴随发生的多次余震作用问题,开展了地下结构在主余震序列作用下的动力响应规律研究,选取典型两层三跨地铁车站为原型,建立了土-地下结构相互作用的有限元数值模型,基于耐震时程法基本概念并结合我国相关抗震标准设计反应谱生成2条耐震时程曲线,构造了12条主余震序列输入,研究了地铁地下车站在主余震序列作用下的侧向变形特征以及损伤破坏规律。结果表明:耐震时程法可以作为主余震序列作用下地下结构抗震性能研究的一种新的高效方法;主震后带损伤结构的侧向变形应充分考虑主余震序列峰值强度比α影响,主震水平与破坏状态越高,则产生余震增量损伤的临界值强度比α越小,结构面临更严重破坏的风险也越高。研究成果为结构在序列型地震作用下的抗震分析与评估提供了新的思路。Here,aiming at current study on aseismic performance of subway underground structures mostly only considering effects of mainshock and ignoring potential multi-aftershock to possibly occur after an earthquake,a study was performed for dynamic response law of underground structure under actions of mainshock-aftershock sequences.A typical 2-story 3-span subway station was taken as the prototype,and a finite element numerical simulation model of soil-underground structure interaction was established.12 mainshock-aftershock sequences as inputs were constructed,based on the basic concept of aseismic time history method and combined with design response spectra in relevant aseismic standards in China,2 aseismic time history curves were generated.Lateral deformation characteristics and damage failure laws of the subway underground station under actions of mainshock-aftershock sequences were studied.The results showed that the aseismic time history method can be taken as a new and efficient method for studying aseismic performance of underground structures under actions of mainshock-aftershock sequences;lateral deformation of the structure with damage after mainshock should fully consider effects of the peak intensity ratioαof mainshock-aftershock sequence;the higher the level of mainshock and the state of failure,the smaller the critical value of the peak intensity ratioαfor generating aftershock incremental damage,and the higher the risk of more serious damage faced by the structure;the study results can provide new ideas for aseismic analysis and evaluation of structures under sequential seismic actions.

关 键 词：地下结构 主余震序列 耐震时程分析 地震损伤 

分 类 号：TU43[建筑科学—岩土工程]