应变率对混凝土抗压特性的影响

Effect of strain rate on dynamic behavior of concrete in compression

在MTS伺服疲劳机上对混凝土试件进行动态受压试验,系统地分析和研究了混凝土屈服强度与内变量及混凝土极限抗压强度与内变量变化率之间的关系,混凝土抗压强度及变形特性与应变率之间的关系.试验结果表明:随着塑性应变的增加,混凝土屈服强度增加,达到极限抗压强度后,屈服强度开始降低;随着塑性应变率的增加,混凝土极限抗压强度发生了明显的增加,但随着塑性应变速率的增加,强度的增加值变小;随着应变率的增加,混凝土的弹性模量增加;但混凝土泊松比随着应变率的增加没有明显的改变.

A dynamic experiment of concrete subjected to various compressive strain rate is carried on the ser-vo fatigue machine and the relationship between yield strength and internal variant and relationship between strength increasing factor and rate of internal variant are analyzed.Results show that yield strength increase with increasing of plasticity strain rate but it decrease after it exceeds the maximum strength,strength increas-ing factor increase with increasing of plasticity strain rate;Elastic modulus increases with the increasing of strain rate but Poisson's ratio of concrete is less sensitive to the strain rate.