摘要
基于湿盐砂环境下锈蚀钢绞线混凝土试件中心拔出试验,分析了钢绞线锈蚀率、黏结长度、箍筋及碳纤维增强聚合物(CFRP)条带加固对锈蚀钢绞线混凝土黏结-滑移曲线、黏结强度及失稳模式等黏结性能的影响.结果表明:CFRP条带及箍筋减少了混凝土劈裂破坏的发生;随着钢绞线锈蚀率的增大,黏结-滑移曲线由微上升滑移、微下降、强化及平稳下降四阶段转变为微上升滑移及快速下降两阶段;以锈蚀率1.50%为界,混凝土初始黏结强度及黏结强度随锈蚀率增大呈先增大后降低趋势,随黏结长度增大,初始黏结强度分布范围及最大黏结强度明显下降;建立了锈蚀钢绞线混凝土的归一化黏结强度计算式,计算值与试验值较吻合.
Based on the central pull⁃out test of corroded steel strand concrete samples under wet salt sand condition,the influences of corrosion ratio of steel strand,bonding length,steel stirrups and carbon fiber reinforced plastics(CFRP)strips to the bonding properties of bond⁃slip curves,bonding strength and failure modes were analyzed.The results indicate that occurrence of concrete spitting failure is reduced by CFRP strips and steel stirrups.With the increase of corrosion ratio of steel strand,the bond⁃slip curves of steel strand change from four stages of slight upward slip,slight downward,strengthening and steady downward to two stages of slight upward and rapid downward.With the corrosion ratio of 1.50%as a dividing,the initial bonding strength and bonding strength increases firstly and then decreases with the corrosion ratio.With the increase of the bonding length,the distribution range of initial bonding strength and maximum bonding strength decrease significantly.A formula of normalized bonding strength of corroded steel strand concrete under chloride environment is established,the calculated values are in good agreement with the test values.
作者
刘云雁
范颖芳
李秋超
LIU Yunyan;FAN Yingfang;LI Qiuchao(College of Transportation Engineering,Dalian Maritime University,Dalian 116026,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2021年第6期1208-1215,共8页
Journal of Building Materials
基金
国家自然科学基金资助项目(51578099)。
关键词
湿盐砂环境
钢绞线混凝土
拉拔试验
黏结性能
黏结强度
wet salt sand condition
steel strand concrete
pull⁃out test
bonding property
bonding strength
