历史荷载作用对混凝土受压动态力学性能的影响

The Influence of Load Histories on Dynamic Mechanical Properties of Concrete

对历经单调加载历史和循环加载历史后的混凝土,进行了应变速率为10-5/s、10-4/s、10-3/s下的单轴压缩试验。试验结果表明:历经单调加载历史的混凝土,随着应变速率的提高,峰值应力、峰值应变、弹性模量均增加;历经循环加载历史的混凝土,随着应变速率的提高,峰值应力和峰值应变均增加,而弹性模量则减小;在应变速率为10-5/s时,历经单调加载历史比历经循环加载历史的混凝土的峰值应力和峰值应变大,但弹性模量相差很小;在应变速率为10-3/s时,历经单调加载历史比历经循环加载历史的混凝土的弹性模量大,但峰值应力和峰值应变相差很小。

In this paper, the concrete after monotonic loading history and cyclic loading history are uniaxial compressed under the strain rate of 10 ^-5/s, 10 ^-4/10^-3/s. The results show that： after the concrete of monotonic loading history,as the strain rate increa- ses, the peak stress, peak strain and elastic modulus are enhanced, after concrete of cyclic loading history, as the strain rate increa- ses, the peak stress and peak strain increase, but the elastic modulus decreases; after monotonic loading history, the peak stress and peak strain at the strain rate of 10 ^-5/s become bigger than the concrete of cyclic loading history, but the difference of elastic modulus is small,and in the strain rate of 10 ^-3/s,the elastic modulus is high,but the difference between peak stress and peak strain is much