基于等效线性土体模型的地基与结构整体地震响应模拟  

Numerical Simulation of Seismic Response of Foundation and Structure Based on Equivalent Linear Soil Model

作　　者：邓捷程 吕龙[3] 孙海忠 吕玺琳[1,2] DENG Jiecheng;LÜLong;SUN Haizhong;LÜXilin(Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Chengdu University of Technology,Chengdu 610059,China;Shanghai Construction Engineering Design and Research Institute Co.,Ltd.,Shanghai 200235,China)

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]成都理工大学,成都610059 [4]上海市建工设计研究总院有限公司,上海200235

出　　处：《结构工程师》2023年第3期85-91,共7页Structural Engineers

基　　金：国家重点研发计划项目(2021YFB2600700)。

摘　　要：考虑动力荷载下土体的非线性和迟滞性,建立了基于等效线性理论的层状地基三维有限元动力分析模型。通过设置黏弹性人工边界实现无限域地基和等效地震荷载模拟,并对计算方法的可靠性进行了验证。进一步建立地震作用下结构和地基相互影响的整体分析模型,模拟得到了结构的地震响应。结果表明,相比根据场地地震反应分析理论建立的模型,基于土体等效线性的动力模型能有效考虑结构与地基的相互影响。建立的模型可用于结构三维动力问题分析,进而为结构抗震模拟分析提供了一个新思路。Considering the nonlinear and hysteresis of soil under dynamic load,a three-dimensional finite element dynamic analysis model of layered foundation based on equivalent linear theory is established.By setting viscoelastic artificial boundary,the infinite domain foundation and equivalent seismic load are simulated,and the reliability of the calculation method is verified.Furthermore,the overall analysis model of the interaction between the structure and the foundation under earthquake is established and the seismic response of the structure is simulated.The results show that the dynamic model based on equivalent linear soil mass can effectively consider the interaction between structure and foundation compared with the model based on site seismic response analysis theory.The model can be used to analyze the three dimensional dynamic problems of structures,which provides a new idea for the seismic simulation analysis of structures.

关 键 词：结构 等效线性 地震 土结相互作用 黏弹性人工边界 

分 类 号：TU435[建筑科学—岩土工程] TU311.3[建筑科学—土工工程]