长江科学院院报2017，Vol.34Issue(11)：121-125,131,6.DOI:10.11988/ckyyb.20160674
不同侧应力状态下混凝土循环加卸载损伤特性
Dynamic Damage Properties of Concrete Subjected to Cyclic Loading and Unloading with Different Lateral Stresses
摘要
Abstract
In this research,dynamic cyclic loading and unloading tests at strain rate of 10-4s-1 under different unidirectional constant pressures are conducted on a large multi-functional static and dynamic force triaxial apparatus.Constant lateral pressures are 0％,5％,10％ of the static uniaxial compressive strength.On this basis,the variation of hysteresis loop of stress-strain curve of concrete under cyclic loading and unloading with varying stress level is researched.The relation between dispersion hysteresis loop and energy dissipation is analyzed,and the damage estimation model is built.Furthermore,the damage characteristics of concrete are researched based on energy dissipation statistics.The following conclusions are obtained:1) in initial unloading stage,the stress decreases rapidly and deformation recovers slowly,but the speed of recovery begins to accelerate with stress declining;2) dissipative energy significantly increases with the increase of lateral stress under the same number of cycles,indicating that unit dissipated energy is apparently sensitive to lateral stress;3) the damage estimation model of concrete is verified to perform well in fitting the relationship between damage and cumulative residue strain;4) the development of damage decreases gradually with the increase of lateral pressure ratio,and in addition,the path of damage accumulation is greatly extended.关键词
混凝土/滞回环/侧压比/耗散能/损伤估计模型/损伤演化Key words
concrete/hysteresis loop/lateral pressure ratio/energy dissipation/damage estimation model/damage evolution分类
建筑与水利引用本文复制引用
刘博文,彭刚,马小亮,谢京辉..不同侧应力状态下混凝土循环加卸载损伤特性[J].长江科学院院报,2017,34(11):121-125,131,6.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）
