摘要
以大比例模型为基础，以大量试验实测数据为依据，利用通用有限元程序MARC对桩-土-上部结构相互作用体系进行了三维有限元计算分析。计算中土体选用线性Mohr-Coulomb理想弹塑性模型，钢筋混凝土采用随动双线性硬化本构模型，计算得到相互作用体系的基频及牵引释放时程曲线与试验结果吻合较好，表明所采用的计算模型和计算方法是合理可行的。从计算分析的角度探讨了考虑结构-地基动力相互作用时体系地震反应的有关规律，主要从体系的加速度、桩身等效应力、桩土接触压力及摩擦力等方面进行了分析，为结构-地基相互作用的进一步研究提供了依据。
Three-dimensional finite element analysis of homogeneous soil-pile raft foundation-frame model is carried out based on both large scale model and mass of measured data in this paper. General-purpose finite element program MARC is adopted in the analysis. In computational analysis, perfectly-plastic Mohr-Coulomb material and kinematic hardening Von-Mises material are chosen to simulate the non-linearity of soil and reinforced-concrete separately, and the changing status non-linearity on soil structure interface is considered by using contact function of MARC. Comparison analysis between computational results and test results shows that the basic frequency and curves in time-domain are coincident approximately, and it＇s verified that the simulation methods in this paper arc rational and the model is feasible. The seismic responses under the consideration of soil pile-raft foundation and structure interaction are discussed in this paper which include acceleration , equivalent von mises stress, contact normal force and friction force on the pile-soil interface. The present work lays a foundation for further research on SSI.
出处
《建筑技术开发》
2006年第11期61-64,共4页
Building Technology Development
