浅埋地下结构地震反应分析的惯性力–位移法  

Inertia force-displacement method for seismic analysis of shallow buried underground structures

作　　者：杜修力[1] 许紫刚 许成顺[1] 李洋[1] DU Xiu-li;XU Zi-gang;XU Cheng-shun;LI Yang(Key Laboratory of Urban Security and Disaster Engineering of the 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

出　　处：《岩土工程学报》2018年第4期583-591,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金创新研究群体项目(51421005);教育部“创新团队发展计划”项目(IRT13044)

摘　　要：现有的地下结构地震反应简化分析方法,如：地震系数法、自由场变形法、柔度系数法、反应位移法、反应加速度法和Pushover分析方法等,均没有考虑上覆回填堆积土体或地震中因剪切破坏失效后的上覆堆积土体在竖向地震作用下产生的惯性力效应。已有研究表明,这种上覆土体竖向惯性力效应对浅埋地下结构支撑构件的抗震性能（抗剪强度和极限变形）有重要影响,是评价浅埋地下结构抗震安全性的关键因素之一,不能忽视。为此,针对浅埋地下结构地震反应分析问题,提出了一种考虑上覆土体竖向惯性力影响的反应位移法,简称惯性力–位移法。给出了惯性力–位移法分析模型的两个关键参数确定方法,包括地基弹簧刚度及上覆土体最大竖向惯性力。工程实例分析结果表明,建议的惯性力–位移法与传统的反应位移法相比,不仅克服了传统的反应位移法不能给出中柱轴力的缺陷外,其它反应量的计算精度与之基本相当。As for the existing practical methods for seismic analysis of underground structures, including seismic coefficient method, free-field racking deformation method, flexible coefficient method, response displacement method, response acceleration method and Pushover analysis method, the inertia force of overburden backfilled soil or overburden soil which has shear failure under the vertical ground motion is not considered. The recent researches show that the vertical inertia force of overburden soil has important influence on the seismic performances（shear strength and ultimate deformation） of support components for shallow buried underground structures. And it is also one of the critical factors in the seismic safety evaluation of shallow buried underground structures, which cannot be ignored. A response displacement method is proposed for seismic analysis of shallow buried underground structures considering the vertical inertia force of overburden soil, called inertia force-displacement method for short. The determination methods for two critical parameters are given, including the foundation spring coefficient and the maximum vertical inertia force of overburden soil layer. The analysis results of engineering projects show that the inertia force-displacement method overcomes the defect of the classical response displacement methods which cannot calculate the axial force of the center column, and the other results have a similar calculation accuracy compared with those of the classical response displacement methods.

关 键 词：地下结构 抗震分析 惯性力–位移法 

分 类 号：TU435[建筑科学—岩土工程] TU92[建筑科学—土工工程]