褥垫层作用下复合地基抗震性能有限元分析

采用大型非线性有限元程序ADINA，针对复合地基-基础-上部结构典型算例，建立了计算模型，并进行了有限元动力时程分析。计算模型中，桩体、桩间土、垫层、基础采用简化的线弹性模型，分别定义材料类型；上部结构采用弯矩曲率梁算法进行计算；在边界设置黏性边界模拟无限域中的动力人工边界。通过数值计算研究了不同桩体刚度对自由场地加固区地表和非加固区地表位移峰值和加速度峰值和桩身所受到的弯矩及剪力的影响；研究了上部结构在不同垫层性质（不同刚度和不同厚度）作用下的动力反应，从而得出垫层的合理设置，为复合地基设计施工提供依据。

Finite element analysis of seismic behavior of composite foundation with bedding cushion

The composite foundations are getting more and more application to construction engineering.However,the research on their seismic behavior under dynamic loading,especially under seismic loading,is quite limited.Now,the seismic response analysis in the time domain is performed with ADINA program,considering the interactions among foundation,footing and superstructure.The influence of earth surface peak acceleration,displacement and pile moment,shearing force under different pile body moduli,the influence of ...