不同加载速率下混凝土单轴受压性能 大样本试验研究.

The nonlinear behavior of concrete structure under dynamic loadings is strongly influenced by loading rates. To investigate the strain rate effect of concrete and its corresponding influence on the stochastic property of concrete, a total of 418 prismatic specimens with strength grade ranges from C30 to C60 subjected to uniaxial compression were tested, involving eight different strain rates between 10-5/s and 10-1/s. The experiments were conducted on the MTS815 testing system and about 16 specimens designed and casted on the same condition were tested for every set of case. The mean and standard variation values of the uniaxial compressive stress-strain curves, as well as the statistical characteristic values of compressive stress and peak strain of concrete with different strength under different strain rates, were obtained through the experiments. Experiment results indicate that the strain rate has a significant influence on the stress-strain mean value curves while other properties rarely change with strain rate. [ABSTRACT FROM AUTHOR]