基于声发射技术的钢纤维混凝土受压损伤本构关系研究  

Compressive Damage Constitutive Model of Steel Fiber Reinforced Concrete Based on AE Technique

作　　者：黄彪 李彪[1] HUANG Biao;LI Biao(School of Cisil Engineering,Wuhan University,Wuhan,Hubei 430072,Chia)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《水利与建筑工程学报》2018年第4期201-208,共8页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51478367;51608397);高等学校博士学科点专项科研基金项目(20130141110044)

摘　　要：通过6组钢纤维混凝土试件轴心受压应力-应变全曲线试验,得到试件的应力-应变全曲线、声发射撞击数-时间关系曲线和声发射参数,研究钢纤维参数对混凝土力学行为和声发射特性的影响。结果表明:随着钢纤维体积掺量和长径比增加,混凝土峰值应力和峰值应变明显提高,其韧性和延性得到显著改善;利用声发射参数分析可区分钢纤维混凝土试件的破坏模式;随着钢纤维的掺入,试件由受拉破坏向剪切破坏转变。基于试验数据,建立了钢纤维混凝土单轴受压损伤本构关系方程,可为纤维混凝土的工程应用和相关规程的修订提供参考。This paper presents an investigation on the effects of steel fiber parameters on the mechanical behavior and acoustic emission（AE）characteristics of steel fiber reinforced concrete（SFRC）.The stressstrain curves,AE hits-time relations and AE parameters of specimens were obtained by conducting the uniaxial compressive stress-strain curves test on the SFRC specimens.The results indicate that with the increase of steel fiber volume fraction and aspect ratio,both the peak stress and peak strain are enhanced,and the toughness as well as the ductility of concrete is improved.The fracture modes can be classified by AE parameter analysis.The fracture mode of concrete changes from tensile mode to shear mode with the incorporation of steel fibers.Based on the test results,a uniaxial compressive damage constitutive model of SFRC is established.The proposed model can serve as a reference for the engineering application of SFRC and future refining of relevant technical specification.

关 键 词：钢纤维混凝土 应力-应变全曲线 损伤演化 本构模型 

分 类 号：TU528.572[建筑科学—建筑技术科学]