长江科学院院报Issue(2)：123-127,132,6.DOI:10.3969/j.issn.1001-5485.2015.02.025
基于声发射技术的混凝土动态损伤特性研究
Dynamic Damage Features of Concrete Based on Acoustic Emission Technology
摘要
Abstract
In order to study the dynamic damage features and damage evolution regularity of concrete,we carried out uniaxial compression test on concrete under different loading rates (1 0 -5 /s,1 0 -4 /s,7.5 ×1 0 -3 /s)and collect-ed the real-time acoustic emission signals.By analysing the relationship between acoustic emission parameters and stress-strain,we obtained the plastic deformation and damage features of concrete under cyclic loading and unloa-ding.Results reveal that the damage concentrates in the early and middle stages of the cyclic loading and unloading process.The damage intensifies with the increase of loading time and cycle numbers.Damage variable also increa-ses along with the increase of accumulated residual plastic strain.Moreover,when loading rate increases,the ener-gy release before the peak gets larger and damage path becomes shorter.When the difference between loading rates gets larger,the damage path difference becomes larger,but the start point and end point of damage curves overlap.关键词
混凝土/声发射/动态损伤/循环加卸载/混凝土单轴压缩试验Key words
concrete/acoustic emission/dynamic damage/cyclic loading and unloading/uniaxial compression test on concrete分类
建筑与水利引用本文复制引用
胡伟华,彭刚,黄仕超,田为..基于声发射技术的混凝土动态损伤特性研究[J].长江科学院院报,2015,(2):123-127,132,6.基金项目
三峡大学研究生培优基金资助 （）
