上部结构刚度改变对桩基地震反应的影响  

INFLUENCE ON SEISMIC RESPONSE OF PILE DUE TO STIFFNESS VARIATION OF SUPERSTRUCTURE

作　　者：胡春林[1] 高波[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,湖北武汉430070

出　　处：《工程力学》2007年第5期145-150,共6页Engineering Mechanics

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，用补充约束方程的方法进行节点耦合，使两种不同类型单元满足连续条件。结合典型工程实例选择桩、土、结构及荷载参数，重点讨论了3种不同的上部结构刚度对桩基地震反应的影响，求出了3种上部结构刚度下体系1阶～6阶的自振周期和桩基的最大位移及内力等，并进行了分析和比较，得到了一些对工程实际有益的结论。The dynamic interaction between the soil and the pile and the superstructure was studied by the method of integral finite element under the seismic condition. The soil side boundary is simulated by using the elastic spring-damper. Input restraint joint is used to settle continuous conditions of the different type of connective unit. Consequently, some useful conclusions are obtained by comparing the vibration of the periods and the displacement as well as the internal force of the piles under the seismic condition, with the consideration of the stiffiaess variations of three types of superstructures.

关 键 词：桩-土-结构相互作用 地震反应 有限元 弹性-阻尼边界 结构刚度 

分 类 号：TU311.3[建筑科学—结构工程] TU355