中文摘要：

为了明确混凝土在动态荷载作用下的力学特性，应用MTS试验机，对C40混凝土在应变速率为10^－5～10^-2s^-1范围内进行单轴抗压试验。系统研究了不同应变速率下混凝土的抗压强度、弹性模量、峰值应变等抗压力学特性，分析了混凝土抗压强度、弹性模量等与应变速率之间的关系。试验结果表明：混凝土抗压强度、弹性模量随着应变速率的增加而增加，峰值应变、泊松比离散性比较大，受应变速率的影响不明显。这些成果有助于掌握混凝土的动态力学特性及建立混凝土的动态抗压本构关系模型。

英文摘要：

In order to investigate the mechanical properties of concrete under dynamic loas, compressive experiments of concrete specimens （C40） are carried out on MTS ,with the uniaxial strain rate ranging from 10^-5 s^-1 to 10^-2 s^-1.The compressive properties of concrete under different stain rates, which include compressive strength, elastic modulus, peak strain and Poisson＇s ratio, are studied systematically.The effect law of strain rates on the compressive strength, elastic modulus and etc.of concrete are analyzed.The test results indicate that the compresseive strength and elastic modulus of concrete would increase with the strain rate increasing.The discreteness of peak strain and Poisson＇s ratio are larger, and the effect of strain rate on peak strain and Poisson＇s ratio are not significant.These research achievements can provide us with a more accurate grasp of concrete dynamic mechanical properties and contribute to build the dynamic compressive constitutive models of concrete.