地震作用下上部结构刚度改变对基桩受力的影响  

Internal force of pile due to stiffness variation of superstructure under the action of earthquakes

作　　者：蒋晓东[1] 李建光[1] 杨小卫 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]核工业第五研究设计院,河南郑州450052

出　　处：《世界地震工程》2007年第3期108-112,共5页World Earthquake Engineering

摘　　要：结合典型工程实例,采用在土体侧向边界节点处用弹簧并联阻尼器来进行模拟,在平面应变单元和桩体梁单元连接处用约束方程的方法进行节点耦合、满足连续条件,选择桩、土、荷载参数,用整体有限元方法进行桩-土-结构相互作用体系的地震反应分析。重点讨论了三种不同的上部结构刚度对桩基地震内力的影响,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,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 pile-soil-structure dynamic interaction under the action of earthquakes is studied by the method of integral finite element . The soil side boundaries are simulated by elastic spring-damper. Input restraint joint is used to settle continuous conditions of the different type of connective unit. Finally, the seismic analyses of stiffness variations of three structures are completed, the results show that the displacement and internal force of the pile increase as the enlargement of the stiffness variation of the superstructure, some useful conclusions are obtained.

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

分 类 号：TU311.3[建筑科学—结构工程]