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为了更好地研究混凝土的力学性能和破坏机理,该文在已有细观力学模型的基础上,发展了高效的骨料投放方法及单元筛分准则。基于连续介质力学的方法,采用弹性损伤本构关系描述混凝土细观各相材料力学行为,建立了随机骨料数值模型及相应的细观单元参数选取方法。以多组不同骨料分布的Petersson三点弯曲梁为例,分析和探讨了混凝土的破坏机理。结果表明,该数值模型能较好地模拟混凝土I型断裂拉伸破坏全过程,与试验结果表现出良好的一致性。
In order to better study the mechanical properties and failure mechanism of concrete, this article has developed an efficient method of aggregate feeding and unit screening criteria based on existing micromechanical models. Based on the method of continuum mechanics, the elastic damage constitutive relation was used to describe the mechanical behavior of concrete mesophase materials, and a random aggregate numerical model and the corresponding selection method of microscopic unit parameters were established. Taking the Petersson three-point bending beam with different aggregate distribution as an example, the failure mechanism of the concrete was analyzed and discussed. The results show that the numerical model can simulate the whole process of tensile failure of concrete type I fractures well, and shows good consistency with the test results.