桩土界面接触单元的研究与应用  

RESEARCH ON CONTACT ELEMENT FOR PILE-SOIL INTERFACE AND ITS APPLICATION

作　　者：刘成[1] 王来贵[2] 杨钊[1] 戚玉亮[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]辽宁工程技术大学力学系,辽宁阜新123000

出　　处：《低温建筑技术》2010年第3期73-74,80,共3页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(10972096)

摘　　要：为解决桥梁群桩基础在上部荷载作用下桩土界面的接触问题,根据接触非线性理论和桩土不同物理力学特性的特点,首先推导反映桩土界面滑移的刚度矩阵,然后提出处理滑移变形的均匀化方法。采用ABAQUS软件的用户子程序接口,编制桩土界面接触单元,可以描述接触在循环荷载作用下的塑性应变增长和残余相对位移,在荷载水平分量作用下的界面脱开现象,以及接触刚度的非线性增长与衰减特性。这样,桩土界面的一些重要特性可以通过有限元的方法得以体现。In order to solve the contact problems of pile-soil interface for the pile group foundation of bridge under upper loads, the stiffness matrix reflecting the slip of pile-soil interface is derived according to the contact nonlinear theory and the different physical and mechanical properties of pile-soil interface. Then a homogenization method is put forward to process the slip deformation. The paper adopts the user subroutine interface in ABAQUS software to produce a program for the contact element of pile-soil interface. It can de- scribe the plastic strain growth and residual relative displacement varying with the cyclic loading, the phenom- enon of interface separation under the action of the horizontal load component, as well as the nonlinear growth or decay characteristic of contact stiffness. In this way, some important features of pile-soil interface can be reflected by using the finite element method.

关 键 词：接触非线性 循环荷载 残余位移 群桩基础 

分 类 号：TU431[建筑科学—岩土工程]