长江科学院院报2016，Vol.33Issue(10)：140-144,5.DOI:10.11988/ckyyb.20150656
混凝土循环加卸载动态损伤演化推移分析及损伤值估计模型
Analysis of Dynamic Damage Evolution Translation and a Model of Estimating Damage Value of Concrete under Cyclic Loading and Unloading
吴彬 1胡伟华 2唐克静 3文沛军2
作者信息
- 1. 湖北工业职业技术学院 建筑工程系，湖北 十堰 443000
- 2. 三峡地区地质灾害与生态环境湖北省协同创新中心，湖北 宜昌 443002
- 3. 十堰市建筑设计研究院，湖北 十堰 443000
- 折叠
摘要
Abstract
Concrete samples were tested by multi-function triaxial instrument under cycle load condition with differ -ent strain rates.The relationship between acoustic emission signals and stress level was analyzed , and the damage e-volution regularity was researched from the aspect of acoustic emission hit number .Furthermore, a single-parameter model that only contains cycle number was established to estimate damage value .The results show that 1) under different strain rates, the paths of damage evolution are not identical .Damage accumulation degree at earlier stage is bigger than that at later stage when the strain is small , and damage curve is flat at later stage ; 2) the damage e-volution path moves forward with the increase of strain rate , and the value of damage development along with the in -crease of strain rate presents a regularity that first increases then decreases with the increase of cumulative residual strain.When cumulative residual strain is certain , the damage development degree at two adjacent strain rates weakens with the increase of strain rate ; 3) the regularity of concrete damage evolution under cyclic loading and unloading is featured with three phases , which can be reflected by statistical density function .关键词
混凝土/循环加卸载/动态损伤/声发射/损伤推移Key words
concrete/cyclic loading and unloading/dynamic damage/acoustic emission/damage variation分类
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吴彬,胡伟华,唐克静,文沛军..混凝土循环加卸载动态损伤演化推移分析及损伤值估计模型[J].长江科学院院报,2016,33(10):140-144,5.
