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混凝土细观力学数值模拟分析所得到的结果与混凝土实际力学性能之间的差异大小,在很大程度上取决于所采用的混凝土骨料模型是否合理.目前,混凝土随机骨料的二维模型生成算法以生长法为主,所生成的骨料几何形态具有较大的局限性,且不便于推广应用至三维问题.研究并提出了一种新的随机骨料二维模型生成方法——块体切割法.首先,引入一组随机平面,并假定其方向及位置符合某种概率分布;然后,基于瓦拉文公式推导出随机平面的相关参数的概率密度函数;最后,通过随机平面切割初始块体,得到不同料径和形状的随机骨料.算例分析结果表明,本方法能够生成符合级配要求的随机骨料,可进一步推广至三维问题.
The difference between the numerical simulation results of concrete micro-mechanics and the actual mechanical properties of concrete depends largely on whether it is reasonable to use the concrete aggregate model.At present, the two-dimensional model of concrete random aggregate The algorithm is dominated by growth method, and the geometry of the resulting aggregate has some limitations, and it is inconvenient to generalize it to the three-dimensional problem.A new method of generating two-dimensional model of random aggregate Cutting method.Firstly, a set of random plane is introduced and its direction and position are assumed to accord with a certain probability distribution. Then, the probability density function of the related parameters of the random plane is derived based on the Wallawnian formula. Finally, The results show that this method can generate random aggregates that meet the gradation requirements and can be further extended to three-dimensional problems.