通过对传统数字混凝土建模方法的研究,提出了改良型数字混凝土建模方法,优化了数字混凝土界面厚度.对新建立的模型进行多工况分析,并将结果与传统模型的数值模拟结果以及试验结果相比较,通过分析得到以下主要结论:①当级配相同时,改变混凝土内部骨料分布会使彼此之间损伤形态产生很大差别,但是损伤单元数量相近；②在超过材料峰值强度之前,混凝土内部骨料位置的变化不会对其力学性能造成显著影响,而在达到失稳阶段时影响较显著；③改良后的模型能够使界面厚度明显降低,计算结果更加贴近试验结果,可以取代传统的数字混凝土模型在工程中的应用.%The improved random aggregate model of concrete was established based on the traditional random aggregate model. The thickness of the interfacial transition zone was reduced. The numerical simulation was carried out and the result was compared And the numerical results can be listed as follows: The fracture morphology had a big difference from each other, but the quantity of damage element was close when the grading of concrete is same. There was no significant influence on the mechanical property of concrete before the value of load exceeds the peak strength, after the value of load exceed the peak strength, this influence become more significant than before. The thickness of the interfacial transition zone was reduced a lot in the improved model, and the computational accuracy was increased. It was deduced that the improved model may take place of the traditional model in engineering practice.
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