Some interface contact models of soil - structure and resolution principles of contact element in universal fem program are introduced . considering the energy dissipation between soil and the box foundation , a modified three dimension goodman contact element is presented , and its element stiffness matrix is derivated . also , some seismic response analysis which in different max acceleration features are presented by using spring in marc program for simulating the modified contact element 4 、介绍了目前几种土与结构接触面常用的界面模型,以及一些大型通用有限元软件的接触单元计算原理,然后在前人研究的基础上考虑土-箱基动力相互作用中的能量耗散,计入阻尼成分,提出了一种改进的goodman三维土-箱基接触单元,并推导了相应的接触单元的单元刚度矩阵。
