摘要
根据钢纤维混凝土具有较大变形和裂缝扩展能力的特点,建立了钢纤维混凝土环向伸长的表达式。在此基础上,将弹性力学理论、虚拟裂缝理论与钢纤维混凝土软化模型相结合,提出了钢筋与钢纤维混凝土黏结强度的计算方法,并进行了试验验证,同时分析了相对保护层厚度（混凝土保护层厚度与钢筋直径之比）、裂缝数量和钢筋直径对相对黏结强度（黏结强度与钢纤维混凝土抗拉强度之比）的影响。结果表明,钢筋与钢纤维混凝土相对黏结强度处于塑性状态解和部分开裂弹性状态解之间;钢纤维体积率在0.5%～1.5%时,随着黏结试件相对保护层厚度的增大和裂缝数量的增多,相对黏结强度增大;随着钢筋直径的增大,相对黏结强度减小。但当裂缝数量大于5或钢筋直径大于32 mm,裂缝数量和钢筋直径的变化对相对黏结强度的影响较小。
According to the significant deformation and crack propagation of steel fibre reinforced concrete （ SFRC）, the expression of hoop elongation for SFRC is established. Furthermore, the calculation method of bond strength between rebar and SFRC is proposed by the elasticity theory, fictitious crack theory and post-cracking softening model. The method is verified by the test results. The effects of relative cover thickness （ratio of concrete cover to rebar diameter）, crack number and rebar diameter on the relative bond strength （ ratio of bond strength to SFRC tensile strength） are analyzed. The results show that the relative bond strength of rebar embedded in SFRC is between plastic solution and partially elastic solution. Within 0. 5%-1.5% volumetric ratio of steel fibre, the relative bond strength increases with the increase of relative cover thickness and crack number, but reduces with the increase of rebar diameter. However, when the crack number is more than five or the rebar diameter is more than 32 mm, the variations of crack number and rehar diameter have insignificant effects on the relative bond strength.
作者
高丹盈
陈刚
汤寄予
HADI Muhammad Najib Sadraddin
赵亮平
GAO Danying;CHEN Gang;TANG Jiyu;HADI Muhammad Najib Sadraddin;ZHAO Liangping(Research Centre of New Style Building Material ＆ Structure,Zhengzhou University,Zhengzhou 450002,China;School of Civil Engineering,Henan University of Engineering,Zhengzhou 451191,China;School of Civil,Mining and Environmental Engineering,University of Wollongong,Wollongong 2522,Australia)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第9期149-157,共9页
Journal of Building Structures
基金
国家自然科学基金项目(51178434)
关键词
钢筋
钢纤维混凝土
黏结强度
rebar
steel fibre reinforced concrete
bond strength
