地下结构抗震性能指标限值的影响因素研究  

Study on the factors influencing the seismic performance indexlimits of underground structures

作　　者：李维沈 李文婷[1] 徐昊哲 LI Weishen;LI Wenting;XU Haozhe(School of Civil Engineering,Shanghai Normal University,Shanghai 201418,China)

机构地区：[1]上海师范大学建筑工程学院,上海201418

出　　处：《自然灾害学报》2024年第6期178-191,共14页Journal of Natural Disasters

基　　金：国家自然科学基金项目(52008248)。

摘　　要：当前对地下结构抗震性能水准限值标定的影响因素研究不够完善,难以匹配地下结构发展的需求。采用有限元软件ABAQUS建立地铁车站-土体相互作用体系的非线性精细化有限元三维模型,利用正交试验考虑不同地震波、结构型式、埋深和场地分别在4种不同水平作用下对地下结构抗震性能的影响。通过参考现有规范和借鉴相关研究,给出了地下结构的抗震性能水准划分的定义并对相应的功能状态进行了描述。最后通过极差分析剖析了不同因素及不同水平对于地下结构抗震性能水准对应的层间位移角限值的影响。结果表明:当结构损伤程度大于性能水准I时,两层两跨结构的承受变形能力最强;同一因素对不同抗震性能水准的层间位移角限值的影响程度不同,得到90%保证率下的性能水准I、II、III和IV的层间位移角限值分别为1/1195、1/505、1/209、1/158;不同抗震性能水准下各因素对限值的影响次序不同,影响规律不明显。The current research on the factors affecting the quantification of seismic performance level limits for underground structures is insufficient.This makes it difficult to match the needs of underground structure development.This paper establishes a nonlinear refined finite element 3D model of the subway station-soil interaction system using the finite element software ABAQUS.The orthogonal test is used to consider the influence of different seismic waves,structural types,buried depths and sites on the seismic performance of underground structures under four different levels.Based on referencing existing standards and drawing from relevant research,this paper provides the definition for the classification of seismic performance levels of underground structures and describes the corresponding functional states.Finally,the effects of different factors and different levels on the interstory drift limit corresponding to the seismic performance level of underground structures were dissected by means of extreme difference analysis.The results show that when the structural damage degree is greater than the performance level I,the two-story two-span structure has the strongest deformation capacity.The same factor has different degrees of influence on the inter-story drift limit for different seismic performance levels.The inter-story drift limits of performance levels I,II,III and IV at 90%guarantee rate are 1/1195,1/505,1/209 and 1/158,respectively.The order of influence of each factor on the limit values at different seismic performance levels is different,and the pattern of influence is not obvious.

关 键 词：地下结构 正交试验 抗震性能水准 极差分析 层间位移角限值 

分 类 号：U231[交通运输工程—道路与铁道工程] TU93[建筑科学—结构工程] TU352