混凝土单轴受压动力全曲线试验研究

Experimental Study on Uniaxial Compression Behavior of Concrete Under Dynamic Loading

摘要:

采用MTS 815.04岩石力学试验机对混凝土单轴受压动力本构关系进行系统试验研究.考虑五种不同加载速度，在位移和应变率双重控制下，得到动力加载条件下单轴受压应力应变全曲线.根据试件的破坏特点，讨论动力加载与静载条件下试件破坏形态的区别，分析峰值应力、峰值应变以及弹性模量等力学参数的应变率效应，并与已有试验结果进行对比.结果表明：本次试验得到的结果揭示了混凝土在单轴受压条件下动力加载全过程的非线性性能，为正确理解混凝土在动力加载条件下的破坏机理提供试验依据.

关键词:混凝土; 动力加载; 应变率效应; 全曲线

Abstract:

A systematic experimental investigation was carried out on dynamic mechanical behaviors of concrete material subjected to uniaxial compression. The cylindrical specimens were tested with a hydraulic test machine named MTS Model 815.04 Rock and Concrete Mechanics Testing System. In the controlled condition of the displacement and the strain rate, the dynamic fully stress strain curves were obtained with five different loading rates. The difference of the failure modes between static loading condition and the dynamic loading conditions is also discussed. Strain rate effects on the compressive strength, the peak strain, the elastic modulus and the fully stress strain curves were investigated based on the experimental results. The study results reveal the nonlinear property of concrete material under uniaxial dynamic compression loading and provid a test basis for an understanding of the physical mechanisms during dynamic loading.

Key words:concrete; dynamic loading; strain rate effect; fully stress strain curve