等幅循环加载历史后混凝土动态特性试验

Experimental Study on Dynamic Behaviors of Concrete Due to Constant Amplitude Cyclic Loading History

对经历不同频率(0、0.5、2.0 Hz)循环加载历史后的混凝土进行了不同应变速率(10-5、10-4、10-3/s)下的单轴压缩试验,研究了循环加载历史下不同循环频率对混凝土峰值应力、峰值应变、弹性模量的影响。研究结果表明:混凝土的峰值应力随着应变速率的提高而增大,随着循环频率的提高先增大后减小;混凝土的峰值应变随着应变速率的提高而增大,随着循环频率的提高而减小;混凝土的弹性模量随着应变速率的提高总体变化规律不明显,随着循环频率的提高先增大后减小。

The concrete was at first treated through cyclic loading history of different cycle frequencies （0, 0.5 and 2.0 Hz）, and then the dynamic uniaxial compression tests were performed under different strain rates 10 -5, 10 -4and 10 -3/s. The effects of different cycle frequencies on the peak stress, peak strain and elastic modulus of concrete were studied. The results show that the peak stress of concrete increases with the increase of strain rate and presents a first increases and then decreases trend with the increase of cycle frequency ; the peak strain of concrete increases with the increase of strain rate and decreases with the increase of cycle frequency ; the concrete elastic modulus do not change obviously in general with the increase of strain rate, but it presents a first increases and then decreases trend with the increase of cycle frequency.