中文摘要：

为了研究混凝土在经循环加载后的损伤特性，采用真三轴材料试验机，对φ150×300 m m的圆柱体混凝土试件在应变速率为10^-5/s、10^-4/s和10^-3/s下进行单轴受压试验，研究了在循环加载后混凝土的峰值应力、峰值应变及弹性模量，并选取基于Weibull统计分布改进后的损伤本构模型进行损伤拟合验证。结果表明，在相同循环加载历史后的情况下，随着应变速率的提高，其损伤变量值明显降低，其损伤应变槛值逐渐增大。该改进后模型可以有效描述单轴循环加载后状态下混凝土的损伤过程。

英文摘要：

In order to study the properties of concrete damage under cyclic loading conditions ,the use of true triaxial testing ma-chines ,for the standard cylindrical concrete specimens at a strain rate of 10^-5/s ,10^-4/s and 10^-3/s uniaxial compression tests are dynamically studied under cyclic loading at the peak stress of concrete ,the peak strain and elastic modulus ,and select Weibull statis-tical damage constitutive model based on the distribution of the improved conduct damage fitting authentication .The results show that in the case of the same cyclic loading history ,with increasing strain rate ,the lower the value of the variable significant damage is ,the damage thresholds strain increases after the improved model can effectively describe the state of the process under uniaxial cy-clic loading of concrete damage .