应变率对混凝土抗拉特性影响

Effects of strain rate on dynamic behavior of concrete in tension

在 MTS伺服疲劳机上对混凝土进行动态受拉试验 ,分析试验结果 ,发现混凝土的抗拉强度与应变率的对数近似成线性关系 ;混凝土的弹性模量、吸能能力均随着应变率的增加而增加 ;泊松比不随应变率的变化而变化 .在此基础上 ,推导出了混凝土的抗拉强度与应变率的近似关系 ,并与文献中的结果进行了比较 .

Dynamic experiment of concrete in tension subjected to various strain rates is carried out on the servo fatigue machine and the experiment results are analyzed. It is found that tensile strength of concrete promotes approximately linear with the logarithm of strain rate, elastic modulus and energy absorption capacity of concrete increase with the increasing of strain rate and Poisson′s ratio of concrete is less sensitive to the strain rate. Finally, the relationship between tensile strength and strain rate is proposed and the results are compared with some results of previous researchers.