土体-结构界面接触对地下结构动力反应的影响

Contact Effect of Interfaces between Soil and Structure on Dynamic Responses of Underground Structures

迄今为止,关于土体与结构交界面的接触效应对地下结构地震反应的影响尚未引起研究者们的重视,成果鲜有报道。本文基于接触面对法和非线性有限元波动分析方法,建立了考虑土体与结构界面接触效应的地下结构非线性地震反应分析模型和计算方法,并利用大型有限元软件ANSYS进行了求解。分析结果表明:土体与结构界面的接触效应对地下结构地震反应有明显影响,可能增大地下结构节点的峰值加速度、峰值位移和峰值应力反应;随着接触摩擦系数的增大,接触点的相对滑移逐渐减小,而接触应力的变化则无明显规律。

The contact effect of interfaces between soil and structure on the seismic responses of underground structures has not attracted researchers＇ enough attention as far,and the research results of this subject are seldom reported.In this paper,the analysis models of seismic responses of underground structures which take account of the contact nonlinearity phenomena of interfaces between soil and structure were established.Based on the contact surface pairs model and the analysis method of finite element of wave motion theory,the analysis model was solved with the software ANSYS.The results show that the contact effect of interfaces between soil and structure has significant influence on the seismic responses of underground structures,which may increase peak stress,peak displacement and peak acceleration of some underground structures nodes;with increase of the friction coefficient,the relative sliding of contact point decrease,while there is not apparent regularity for contact stress.