桩-土（软支撑）-结构非线性动力相互作用分析

基于群桩-土软支撑模型，建立了土-结构相互作用有限元简化分析模型.针对不同地震激励，不同桩-土条件下对模型进行了动力非线性时程分析．结果表明：在某些地震动和土-基础条件下，上部结构非线性作用动力反应结果可能大于固基假定情形，且下部桩-土软支撑会对上部结构柔弱层位置产生影响，分析结果与现有的试验成果具有良好的一致性.以简化非线性弹-阻单元的形式等代桩-土实体单元接触面，能有效和快速地进行复杂的SSI动力时程分析及抗震评估.
Based on the pile-soil soft support model, a simplified interaction finite element analysis model of soil- structure was established, and the nonlinear dynamic time history analysis was conducted for this model under different seismic excitations and different conditions of the pile-soil. The result shows that, under certain ground motion and soil-foundation conditions, the nonlinear effect of the upper structure can be greater than fixed base assumption, and pile-group-soil soft support model also influences the weak layer position on the upper structure. The analysis results and the existing test results are in good agreement. By using structural units to solve complex computational problems in geotechnical engineering, designers can carry out dynamic time history analysis and seismic evaluation for the superstructure quickly, accurately and efficiently.