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利用大型多功能动静力三轴仪对混凝土试件进行了5种应变速率下的动态循环加卸载压缩试验。对混凝土的物理力学参数的变化规律进行了统计分析。结果表明:峰值应力和弹性模量随加载速率的提高而增大,但峰值应变随加载速率的变化表现出较大的离散性。在此基础上,进一步研究了混凝土在不同加载速率下的刚度退化规律。最后,选用基于Weibull统计理论的分段式动态损伤本构模型对试验数据进行拟合。经验证,此模型能够较好的模拟混凝土材料的本构特性。
The dynamic cyclic loading and unloading compressive tests of concrete specimens under five kinds of strain rates were carried out by using the large-scale multi-functional static and dynamic triaxial apparatus. The law of physical and mechanical parameters of concrete was analyzed statistically. The results show that the peak stress and the elastic modulus increase with the increase of the loading rate, but the peak strain changes with the loading rate shows a greater dispersion. On this basis, the stiffness degradation of concrete under different loading rates is further studied. Finally, the sectional dynamic damage constitutive model based on Weibull statistical theory was used to fit the experimental data. It is verified that this model can better simulate the constitutive properties of concrete materials.