考虑薄层连接单元的桩-土-结构动力有限元分析

Dynamic Finite-Element Analysis of Pile-Soil-Structure System Considering Thin-Layer Contact Element

考虑土和结构物的动力相互作用时,两者之间的接触状态必然对基础和结构反应产生影响.通过假定桩土接触面薄层单元本构关系特征,人为地在两种不同材料交界面上引入一种位移间断面,并采用有限元方法将其位移及刚度反应到桩土子结构中.文中给出了桩 土 上部结构动力有限元平衡方程.计算分析表明,考虑薄层单元接触效应与假定桩土位移一致协调条件下所得的动力反应结果是有一定差异的.

The response of foundation and structure is indispensably influenced by the contacting status between soil and structure, if considering their dynamic reaction. So this paper proposed a discontinuous displacement model on the interface between two different materials, after postulating the constitutive relation in the thin-layer elements of the contacting surface. The dynamic equilibrium equations of pile-soil-structure system were obtained by adding the contribution of the interface elements to those of the pile-soil elements. The calculation shows that the system′s dynamic response based on the interface effect have some difference from those based on the consistent displacement on the pile-soil′s interface.