长江科学院院报2017，Vol.34Issue(3)：134-138,5.DOI:10.11988/ckyyb.20151017
大尺寸饱和混凝土单轴压缩动态性能试验研究
Dynamic Performance of Large Size Saturated ConcreteUnder Uniaxial Compression Test
摘要
Abstract
In order to study the dynamic properties of large size saturated concrete, we carried out uniaxial compression tests under different strain rates.By using large-scale multi-function static and dynamic triaxial test machine, we prepared cylindrical concrete specimens with diameter 300 mm and length 600 mm and obtained dynamic mechanical properties of the concretes.Then, we analyzed the failure mechanism according to failure shape.Test results show that peak stress and energy absorption capacity increased with the increase of the loading rate, so did peak strain and elastic modulus.On the basis of stress-strain relation, we established a damage constitutive model of concrete.In the model, stress-strain relation conformed with Weibull statistical distribution before peak stress;while after peak stress, the relation conformed with Lognormal statistical distribution.Shear failure at a few conjugated inclined planes were observed.According to crack expansion after specimen failure, we explained the causes of spalling failure of concrete and analyzed the failure mechanism in aspects of material composition and energy absorption ability.关键词
大尺寸/饱和混凝土/动态性能/本构模型/破坏机理Key words
large size/saturated concrete/dynamic behavior/constitutive model/failure mechanism分类
建筑与水利引用本文复制引用
王孝政,彭刚,马小亮,邓媛..大尺寸饱和混凝土单轴压缩动态性能试验研究[J].长江科学院院报,2017,34(3):134-138,5.基金项目
国家自然科学基金项目(51279092) （51279092）
三峡大学科研创新项目(CX2015025) （CX2015025）
