均匀土-箱基-结构相互作用体系的计算分析  

Computer analysis of soil-box foundation-structure dynamic interaction by ANSYS program

作　　者：李培振[1] 吕西林[1] 陈波[1] 陈跃庆[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《地震工程与工程振动》2002年第5期115-121,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金重点项目资助 (编号 :5 982 30 0 2 ;5 0 0 2 5 82 1)

摘　　要：采用通用有限元程序ANSYS ,针对振动台试验中的均匀土 -箱基 -结构试验进行了三维有限元分析 ,计算中土体的本构模型采用等效线性模型 ,利用面 -面接触单元考虑土体与基础交界面的状态非线性。计算表明 ,基础底面和土体发生了滑移 ,基础侧面和土体之间发生了滑移和脱离 ;上部结构柱顶加速度反应主要由基础转动引起的摆动分量组成。通过与试验结果的对照研究 ,二者得出的规律基本一致 ,验证了采用的计算模型与分析方法的合理性 ,为进一步计算研究和实际工程应用奠定了基础。Three-dimensional finite element analysis of soil-box foundation-structure test is carried out. General purpose finite element program ANSYS is adopted in the analysis. Commonly used equivalent linearity model is chosen to consider the dynamic constitution model of soil and the changing-status non-linearity of soil-structure interface is considered by surface-to-surface contact element. The calculations demonstrate that sliding occurs between the bottom of foundation and the soil, while sliding and separation occur between the side of foundation and the soil. The rocking is the main part of seismic acceleration at the top of super structure. Soft soil can filter and isolate vibration. Issues drawn from computational analysis are consistent with those from test results. The rationality of calculation model and analysis method is verified through comparison study between calculation and test results. The present work provides the basis for further calculation research and practical application.

关 键 词：结构-地基 振动台试验 ANSYS程序 箱基 土体 机构模型 土动力学 

分 类 号：TU435[建筑科学—岩土工程]