长江科学院院报Issue(3)：141-146,6.DOI:10.11988/ckyyb.20140706
基于声发射的自然与饱水状态混凝土动态劈拉特性对比
Comparative Analysis on Dynamic Split Characteristics of Natural and Water Saturated Concretes Based on Acoustic Emission
摘要
Abstract
Radial splitting tensile tests for natural and water saturated concrete specimens with size ofΦ150×150mm was carried out under different strain rates( 10-5 ,10-4 ,10-3 and 10-2 s-1 ) . Splitting tensile strength of concrete was analyzed in detail, and energy release characteristics and damage law of natural and water saturated concretes were researched in the whole process of splitting tensile damage by real⁃time acoustic emission data. The results show that:1) with the increase of loading rate ,splitting tensile strength of natural and water saturated concretes increa⁃ses;2 ) at low strain rates ( 10-5 , 10-4 and 10-3/s ) , the splitting tensile strength of water saturated concrete is smaller than that of natural concrete due to the wedging action of free water, whereas at the strain rate of 10-2/s, the splitting tensile strength of water saturated concrete is larger than that of natural concrete due to Stefan effect;3) dynamic enhancement factor of water saturated concrete is larger than that of natural concrete, and strain rate sensitivity of water saturated concrete is more obvious;4) acoustic emission signal characteristics is in accordance with concrete failure characteristics, and acoustic emission data can be used to accurately monitor the process of concrete splitting tensile failure.关键词
混凝土/饱水状态/应变速率/动态劈拉特性/声发射Key words
concrete/water saturated/strain rate/dynamic splitting tensile characteristics/acoustic emission分类
建筑与水利引用本文复制引用
邹三兵,杨乃鑫,罗曦,彭刚..基于声发射的自然与饱水状态混凝土动态劈拉特性对比[J].长江科学院院报,2016,(3):141-146,6.基金项目
国家自然科学基金项目 （）
