成层地基–桩基–结构动力相互作用体系的计算分析

以一个1∶2大比例模型结构–地基的动力相互作用模型试验为基础,结合通用有限元程序MSC.Marc,对成层地基–桩基–结构动力相互作用体系进行了三维有限元分析。计算中采用考虑土非线性特征改进的黏弹性人工边界模拟外部土域,利用考虑动力相互作用中桩土分离、滑移以及桩基提离效应的接触模型反映桩土接触界面特性,并引入阻尼项表征桩土动力作用中的能量损耗,土体采用等效线性模型。通过计算分析与试验的比较研究,验证了计算模型和分析方法的合理性,进行了地震动输入下的地震反应分析,为地基–结构动力相互作用的进一步研究奠定了基础。

Computational analysis of dynamic layered soil-pile-structure interaction

3D finite element analysis of layered soil-pile-structure model test on a scale of 1∶2 was carried out.General finite element program MSC.Marc was adopted in the analysis.The viscous-spring artificial boundary considering the dynamic nonlinear behaviors of soil was used to simulate the far field,and the 3D contact model was applied to simulate the effect of separating,sliding and pile uplifting in the dynamic soil-pile interaction.At the same time,the problem of the energy dissipation during dynamic interaction was solved by adding the damping component,and common equivalent linearity model was chosen to consider the non-linearity of soil.The rationality of computational model and analysis method was verified through comparison between the calculated and test results.The present work laid a foundation for further studies on dynamic soil-structure interaction.