上部结构刚度对桩基地震动力响应的影响  

Influence of Seisimic Response on Pile Due to Stiffness Variation of Superstructure

作　　者：胡春林[1] 杨小卫[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院

出　　处：《土工基础》2007年第2期21-24,共4页Soil Engineering and Foundation

基　　金：国家自然科学基金资助项目(50278074)

摘　　要：用整体有限元方法进行桩-土-结构动力相互作用体系的地震反应分析。在土体侧向的边界节点处用弹簧并联阻尼器来进行模拟;在土体平面应变单元和桩体梁单元连接处,用补充约束方程进行节点耦合,使两种不同类型单元满足连续条件。结合典型工程实例求出了三种上部结构刚度下体系1至6阶的自振周期和桩基的动力响应,并进行了分析和比较,得到了在水平地震荷载作用下上部结构刚度的增大将增大桩基的内力及水平位移的响应,且桩顶及桩身处于第一个软硬土层交界面处的截面的内力尤为突出等结论。The interaction of pile-soil-structure dynamic is studied with the method of integral finite element under the seismic condition. The soil side boundary is simulated by the elastic spring-damper and the continuous conditions of the difference type of connective unit is settled by inputting restraint joint. The parameters of pile, soil, structure and load are selected, which are combined with the typical engineering example. Then, the seismic influence of three structure stiffness variation is analyzed carefully, compared with the inherent vibration periodic time, the displacement and the internal force of the pile. Finally, some useful conclusions are obtained.

关 键 词：桩-土-结构相互作用 弹性-阻尼边界 地震反应分析 上部结构刚度改变 

分 类 号：TU473[建筑科学—结构工程]