基于ABAQUS的水工混凝土细观分析周期性边界条件自动施加

Auto-application of Periodic Boundary Condition for Mesoscopic Analyses of Hydraulic Concrete Based on ABAQUS

在混凝土计算均匀化的研究工作中,与Dirichlet和Neuman边界条件相比,周期性边界条件因其计算结果精度高的优点得到广泛应用.但是,对于水工混凝土而言,其细观数值模型结构复杂,单元节点众多,使得周期性边界条件的施加成为一个难题.为此,本文基于周期性边界条件理论以及有限元计算软件平台ABAQUS,提出了水工混凝土细观分析周期性边界条件自动施加方法.最后,在3种不同工况下,使用本文方法对混凝土细观数值模型施加周期性边界条件.结果表明,3种工况下,混凝土数值模型的变形和应力分布均符合周期性边界条件的特征,即位移连续和应力连续,验证了本文所提出的周期性边界条件自动施加方法的正确性.

Compared with the boundary conditions of Dirichlet and Neuman,periodic boundary condition is widely used due to its high accuracy results in the research of computational homogenization of concrete.However,the application of periodic boundary condition becomes a difficult problem for hydraulic concrete,because of complex structure and numerous nodes of mesoscale numerical model.In this paper,a method of auto-application of periodic boundary condition for mesoscopic analyses of hydraulic concrete is proposed based on the theory of periodic boundary condition and FEM software ABAQUS.Finally,periodic boundary condition is applied to the mesoscopic numerical concrete model under three different conditions.The results show that the deformation and stress distribution of numerical concrete model are in line with the characteristics of periodic boundary condition,namely displacement continuity and stress continuity,which verify the method of auto-application of periodic boundary condition proposed in this paper is correct.