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混凝土的动态力学特性与静态情况下有很大的不同,为了明确高强混凝土在动态条件下的受拉力学特性,本文应用MTS试验机,对C50混凝土在应变速率为10-5/s～10-2/s范围内进行单轴动态拉伸试验,系统研究了不同应变速率下混凝土的抗拉强度、弹性模量、峰值应变等抗拉力学特性,并分析了应变速率对高强混凝土抗拉强度、弹性模量等力学指标的影响规律。试验结果表明:混凝土抗拉强度、弹性模量随着应变速率的增加而增加,泊松比离散性比较大,增加趋势不明显,动态受拉应力应变曲线与静态相似。这些成果有利于完善混凝土的动态本构关系。
In order to clarify the tensile mechanical properties of high-strength concrete under dynamic conditions, the MTS test machine is used to test the dynamic mechanical properties of concrete at static strain rates of 10-5 / s ~ 10- 2 / s dynamic tensile test of uniaxial dynamic tensile test of concrete under different strain rates of tensile strength, elastic modulus, peak strain and other mechanical properties of tension and analysis of the strain rate of high-strength concrete tensile strength, Elastic modulus and other mechanical indicators of the law of influence. The experimental results show that the tensile strength and elastic modulus of concrete increase with the increase of strain rate, and the Poisson’s ratio is relatively large and the increasing tendency is not obvious. The dynamic tensile stress-strain curve is similar to static. These achievements are conducive to improving the dynamic constitutive relationship of concrete.