广义位移法在土-结构相互作用问题分析中的应用

对目前土 -结构相互作用的有限元法数值建模中的若干不足进行了评述。通过深入分析土 -结构相互作用的力学机制 ,指出 :在相互作用体系中 ,由于两者之间悬殊的刚度 ,接触界面上公共节点的位移将受到结构本身变形性态的影响 ,在假设接触界面变形协调的前提下即是要求这些点的位移都应服从结构体变形的位移模式 ;因此 ,土 -结构相互作用整体有限元数值模拟的关键在于如何较好地反映由于土中结构体刚度条件而导致的、对周围土体变形所施加的一种约束条件。针对桩 /板筏与地基土的两类土结构相互作用问题 ,根据梁、板的工程弹性理论分别建议了桩 /筏基础结构的广义位移模拟方法。

Application of generalized freedom method to the analysis of soil-st ructure interaction problems

The paper revealed some faults of FEMs for soil-s tructure interaction p roblems. On the base of subtle analysis of the soil-structure interaction mechan ism, it was suggested that in the soil-structure integral FE models displacement of all the nodes on the interface will be affected by the deformation mode of s tructures because of the big stiffness difference between the structure and soil . Hence the critical point of the numerical simulation of soil-structure interac tion lies in how to process the above nodal displacement constraint conditions.F inally,two new FE models of pile and raft structures have been presented in the paper by using generalized freedom methods.