地下管道管体地震响应的数值模拟

摘要

Based on ANSYS software,this paper takes Drucker-Prager model to consider soil nonlinearity,the dynamic effect of soil-pipeline is achieved by flexible-flexible interface,and uses Lagrange multiplier method to solve contact effects. What's more,viscoelastic boundary around the soil model can make energy dissipated. By numerical calculation,the paper gets the displacement,acceleration and stress of pipeline under the seismic waves. The results show that the proposed analysis model and method of this paper can accurately simulate the response and interaction of soil and structure in test,which establish the foundation for analyzing seismic response theory of underground pipeline structure.%基于ANSYS软件,采用Drucker-Prager本构模型来考虑土体非线性,土 管道动力作用通过建立柔 柔接触面来实现,利用拉格朗日乘子法求解接触效应,土体四周及底部定义粘弹性边界以实现能量辐射. 通过计算得到管道在地震波下的位移、加速度和应力的动力响应规律. 结果表明,所提出的分析模型和方法能够比较准确地模拟试验中土体和结构的反应及其相互作用,为地下管线等长线型地下结构的地震响应理论分析奠定基础.