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中文摘要：
混凝土具有应变软化性能,是典型的准脆性材料。为了在细观脆断材料的基础上模拟混凝土的软化性能,建立了细观结构中含初始缺陷的细观脆断模型,并提出了将等效断裂强度准则作为细观破坏的判断依据。利用该模型对混凝土的单轴受力性能进行了模拟,分析了不同含量的初始缺陷对数值结果的影响。结果表明：初始缺陷的含量越高,数值结果中的软化越明显。说明在混凝土细观脆断模型的研究中,细观结构中的初始缺陷是模拟宏观准脆性的重要条件。
英文摘要：
Concrete is a typical quasi-brittle material that has the feature of strain softening.In order to simulate the concrete′s softening feature based on mesoscopic quasi-brittle material,we build a mesoscopic quasi-brittle model in which initial defects are considered in the micro-level structure,and propose that the equivalent fracture strength criterion should be adopted as the mesoscopic destruction criterion.The numerical simulation of uniaxial tension is conducted.We analyze the effects of different contents of the initial defects on the numerical results.The conclusion is that the tension/compression softening is more obvious with the increasing of the content of the initial defects.It shows that initial defects in the micro-level structure are key condition for the simulation of macro-level quasi-brittle behavior of concrete.
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