用于接触面模拟的非线性薄层单元

为了使结构与地基间接触面的模拟计算既易于工程实际应用又有较高精度，通过分析研究Ｇｏｏｄｍａｎ单元与Ｄｅｓａｉ提出的薄层单元，综合了二者的优点，在有厚度的Ｇｏｏｄｍａｎ单元模型基础上，借鉴Ｄｅｓａｉ构筑接触面单元的思想，在单元数值模型中，引入了控制嵌入的方法。在本构关系上，所用的模型同时考虑了接触面法向和切向的非线性特性，并提出了超余应力转换和嵌入调整混合迭代模式。依据上述接触面单元模型编制了有限元计算程序，利用此程序进行的算例分析，验证了模型的合理性和程序的计算精度。

Nonlinear thin-layer element for modeling interface

To improve the precision of interface modeling and be easy to be employed in engineering application, a new kind of element which is based on the Goodman element is developed. The method of controling penetration used in thin layer element by Desai is introduced into the present model. In this model, nonlinear characteristics of interface in normal and stear direction are considered and a mixed iteration method of residual stress redistribution and penetration controlling is utilized. The results of numerical tests show good accuracy of present model.