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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.
The dynamic compression test of concrete specimens was carried out on MTS servo fatigue machine. The relationship between yield strength, internal variables and ultimate compressive strength of concrete and the rate of change of internal variables were systematically analyzed and studied. The compressive strength and deformation characteristics of concrete And strain rate.The experimental results show that with the increase of plastic strain, the yield strength of concrete increases, and after reaching the ultimate compressive strength, the yield strength begins to decrease. With the increase of plastic strain rate, the ultimate compressive strength of concrete However, with the increase of plastic strain rate, the increase of strength becomes smaller. With the increase of strain rate, the elastic modulus of concrete increases. However, the Poisson’s ratio of concrete has no obvious change with the increase of strain rate .