桩头侧向集中荷载作用下桩-土系统的非线性动力性能分析  

NONLINEAR DYNAMIC BEHAVIORS OF PILE-SOIL SYSTEMS UNDER LATERAL IMPULSIVE HEAD-LOADING

作　　者：赵振东[1] 傅铁铭 土岐宪三[2] 

机构地区：[1]国家地震局工程力学研究所 [2]京都大学工学部

出　　处：《地震工程与工程振动》1997年第3期100-109,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金

摘　　要：在对侧向动载作用下桩－土相互作用系统的数值模拟方法进行了评述之后，一个三维显式有限元模型被用来描述桩－土系统，以分析其在施加于桩头的侧向脉冲式动载作用下的非线性动力性能，其中混凝土桩被考虑为线弹性材料，而桩周土体被模拟为一种可进入破坏状态的弹塑性材料，同时滑移界面单元被用来模拟桩、土间的滑移和分离．计算结果表明，桩－土系统的侧向动力性能由桩头的约束条件和地表以下一定深度内的系统上部的性能参数所控制，而桩长对此影响不大．After a review on the modelling methods of pile-soil interaction system under lateral dynamic loading, a three-dimensional explicit finite element code is employed to repre￣sent this system for analyzing its nonlinear dynamic behaviors under lateral impulsive head-loading, in which the concrete pile is considered to be a linear elastic material, the surrounding soil is modelled as a kind of elasto-plastic medium with failure, and the sliding interface segments are used to simulate the slippage and separation between the pile and surrounding soil. The analysis of the computed results indicates that the con￣straint condition at the pile head and the properties of the upper part of the pile-soil system within a certain depth from the ground surface control the lateral dynamic behaviors of the system, on which the pile length almost has no effects.

关 键 词：桩-土系统 桩头 侧向荷载 非线性 动力性能 

分 类 号：TU473.11[建筑科学—结构工程]