土与结构间一种新的接触单元模型

New Contact Element of Interface Between Soil and Structure

将非线性弹性理论与弹塑性理论相结合,对于土与结构间接触面切线方向提出了一种非线性弹性-理想塑性本构模型,用于模拟土与结构相互作用体系中切向变形与破坏机理.该模型将接触带内的变形分为剪切变形与错动变形两部分,对于法线方向采用法向应力与法向相对变形之间的非线性模型.将该模型与有厚度接触面单元相结合,提出了一种用于有限元计算的接触带单元.详细推导了该模型的弹塑性矩阵以及应力修正方法.

Based on the nonlinear elastic theory and elastic-plastic theory,a new model for nonlinear ~elastic-plastic model in consideration of the constructive model in the direction of tangent of the interface between soil and structure was put forward,for the purpose of modeling the tangent deformation and failure mechanism of the interaction between soil and structure.The deformations in the contact slice of the model consist of two parts i.e. shear deformation and sliding deformation.For the normal constructive model,the nonlinear model between the normal stress and normal relative deformation was adopted.Combining contact face element with thickness,a contact slice element used in finite element method was proposed. Finally,the elastic-plastic matrix of this model and stress modification method were investigated in detail.