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中文摘要：
基于混凝土冲击荷载作用下的实验研究，以修正Ottosen四参数破坏准则为屈服法则，引入损伤，构造了一个动态本构模型用于描述混凝土材料的冲击特性。宏观上，假设混凝土材料是一个均匀连续体；而从细观角度来看，混凝土材料内部存在大量随机分布的微裂纹损伤。假设微裂纹均匀分布，且符合理想微裂纹体系统条件，定义含裂纹材料中单位体积内微裂纹所占的比例来表征微裂纹损伤所引起的混凝土材料宏观力学性能的劣化，并给出了损伤的演化方程。通过模型计算模拟结果与实验结果比较发现，模拟曲线与实验曲线拟合良好，因而可以用该模型模拟混凝土材料在冲击荷载下的动态特性。
英文摘要：
Based on experimental results, adopting damage and failure principle of Ottosen, this paper proposes a dynamic constitutive model to describe mechanical behavior of concrete subjected to impact loading. Macroscopically, concrete is assumed to be homogeneous and consecutive, but a large amount of micro-crack defects are distributed randomly throughout the concrete. Assuming these micro-cracks satisfy perfect micro-crack system conditions, the volume ratio of micro-cracks in the sample is used to describe the decrease in macro-mechanical properties of concrete. And the development of damage is presented. A comparison between model prediction and experiment results shows that the model prediction agrees well with experiment results. So it can be used to simulate the dynamic behavior of concrete under impact loading.
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