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中文摘要：
针对混凝土在不同应变率加载作用下的变形和强度特征，在现有试验数据研究基础上，首先提出了基于热力学定律的一般弹塑性损伤模型，再将应变率敏感性参数引入其中，推导出了应变率型弹塑性损伤本构模型．模型计算结果与试验结果比较表明，所建立的本构模型可以很好地描述混凝土在不同加载速率时的力学特征．应用该模型可预测大范围应变加载情况下混凝土破坏强度．结果表明：应变率对混凝土力学性能影响较大．
英文摘要：
Considering the strength and deformation characteristics of concrete under different strain rates, a general strain rate-independent elastoplastic damage model was first introduced based on the thermodynamics theory. Then, a strain rate-dependent model was deduced by introducing strain rate sensitivity pa rameters in the general elastoplastic damage model. The numerical calibration of the modelling for concrete under different strain rates were performed. Study shows that this strain rate dependent model for concrete can well represent the main mechanical behavior and it is in good agreement with the experimental data. The proposed model can also be used to predict the failure stress in a large range of strain rates. Strain rate has a great influence on the mechanical properties of concrete materials.
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