SH波斜入射时三维结构-土-结构相互作用分析  

Analysis of three-dimensional structure-soil-structure interaction subjected to inclined SH plane wave

作　　者：陈少林[1] 常梦利 

机构地区：[1]南京航空航天大学土木工程系,江苏南京210016

出　　处：《地震工程与工程振动》2017年第1期81-90,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51378260;51178222)~~

摘　　要：本文实现了SH波斜入射时三维结构-土-结构动力相互作用分析。半无限土体采用集中质量显式有限元结合透射人工边界进行分析;结构经有限元离散后,采用Newmark隐式积分方法进行分析;刚性基础的响应采用显式积分方法计算。通过算例,分析了相邻结构存在与否、结构间距、结构大小、结构前后位置、SH波入射角度对基础和结构地震响应的影响。结果表明:(1)SH波入射角度对结构-土-结构相互作用有较大影响,随着入射角度的增大,高频段的干涉和遮挡效应较为明显;(2)两相邻结构中,大结构对小结构的影响较大,小结构对大结构影响较小;(3)当考虑结构-土-结构相互作用时,不仅结构自身各个自由度之间的运动存在耦合,而且通过土体的联系,相邻结构的各个自由度之间也存在耦合。(4)通过地震记录或地脉动测试获取结构自振特性时,应考虑相邻结构的影响,避免混淆。A computationally efficient explicit-implicit FEM to analyze the response of three-dimensional structure- soil-structure system subjected to inclined SH plane wave is presented. The unbounded soil is modelled by lumped- mass explicit finite element method and transmitting boundary condition, the structure is analysed through implicit finite element method, and response of the rigid foundation is calculated through explicit time integration scheme. The different time steps can be chosen for the explicit and implicit integration scheme, which can greatly improve the efficiency. The effect of incident angle of SH wave, relative size of two structures and their separation distances have been studied. The results of numerical examples showed that the presence of neighbouring building may change the nature of single soil-structure interaction problem appreciably due to shielding and wave interference. The interaction between the structures through the soil will produce the coupling between horizontal, rocking, tor- sional and vertical motion of foundations. The resonant frequency of structure may also be recorded in surrounding structures.

关 键 词：结构-土-结构相互作用 透射边界 地震波 集中质量显式有限元 显-隐式积分方法 

分 类 号：TU4[建筑科学—土工工程] P315.31[天文地球—地震学]