二维混凝土随机骨料模型研究

Two-dimensional random aggregate structure for concrete

为研究二维混凝土随机骨料的投放算法、为混凝土宏观强度分析研究提供依据,将混凝土考虑为由粗骨料和水泥砂浆胶体构成的复合材料,确定了以面积为标度的骨料侵入判断准则和凸多边形骨料生成方式,在此基础上形成二维混凝土随机骨料投放算法。同其他方法相比,建立的"凸型"骨料随机投放算法简单,更易于推广到三维空间。最后给出了骨料随机投放的二维数值混凝土模型和一个简单的混凝土不均质特性分析实例,以说明该文算法的有效性。

 The distribution of random convex aggregates in a twodimensional field is the basis for strength analysis of concrete structures. The concrete was analyzed as a twophase system consisting of the coarse aggregate and the mortar matrix with dissolved fine aggregate. A numerical model was developed to simulate the random aggregate structure. Conflict or overlap in the packing process were removed with conflict and overlap criteria based on an area index. The power of the random aggregate structure for solving heterogeneous problems is then illustrated by numerical examples. Experimental results show that compared with other methods, the developed method with convex aggregate is easier to be used in 3D problems.