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提出一种混凝土材料宏观力学特性分析的新方法——随机多尺度力学模型分析方法。从描述混凝土材料的细观尺度入手,首先采用Monte Carlo法生成由骨料颗粒及砂浆基质组成的混凝土试件的随机骨料模型;然后采用材料特征单元尺度法来剖分有限元网格并投影到建立的随机骨料模型上,各单元网格的力学特性则采用复合材料等效化方法来确定。通过分析,给出了混凝土单轴拉伸情况下的变形及宏观应力-应变关系,结果与实验结果相比较为吻合;与细观力学模型相比,该文方法极大地节省了计算资源,具有高效性。
A new method for analyzing macroscopic mechanical properties of concrete materials is proposed - a stochastic multi-scale mechanical model analysis method. Starting from describing the meso-scale of concrete materials, a Monte-Carlo method was used to generate random aggregate model of concrete specimens composed of aggregate particles and mortar matrix. Then the finite element mesh was projected and projected using material feature unit scale method To the established random aggregate model, the mechanical properties of the grids are determined by the method of composite material equivalent. Through the analysis, the deformation and the macro-stress-strain relationship of concrete under uniaxial tension are given, and the results are in good agreement with the experimental ones. Compared with the meso-mechanics model, this method greatly saves the computational resources and has Efficient.