墩粗钢筋在高强钢纤维混凝土中的黏结锚固性能  

Bond Behavior between Upsetting Steel Bar and High Strength Steel Fiber Reinforced Concrete

作　　者：陈子璇 李新星 肖建庄[1] 陈宣言 李水生 CHEN Zixuan;LI Xinxing;XIAO Jianzhuang;CHEN Xuanyan;LI Shuisheng(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Construction Fifth Engineering Division Co.,Ltd.,Changsha 410004,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中国建筑第五工程局有限公司,湖南长沙410004

出　　处：《建筑材料学报》2023年第9期1003-1010,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(52078358)。

摘　　要：为探究墩粗钢筋与高强钢纤维混凝土之间的黏结锚固性能,以黏结长度、保护层厚度和钢筋类型为试验变量,开展拔出试验.通过黏结-滑移曲线、破坏模式、黏结强度及峰值滑移等分析墩粗钢筋-高强钢纤维混凝土的黏结-滑移性能.结果表明:混凝土的黏结强度随着黏结长度的增加而降低,且对墩粗钢筋试件的影响更明显;提高保护层厚度可以提升黏结性能,但作用有限;钢筋进行墩粗处理可以有效提高钢筋与混凝土之间的黏结强度,显著降低峰值滑移,改变破坏模式.基于试验数据,建立了混凝土的黏结-滑移关系.Pull-out tests were carried out in order to investigate the bond behavior between upsetting steel bar and high strength steel fiber reinforced concrete(SFRC).The bond lengths,concrete coverage thicknesses and different types of steel bar were considered.Bond-slip relationship,failure pattern,bond strength and the corresponding slip were analyzed.The results show that the bond strength decreases with the increase of bond length,which is more obvious in the upsetting steel bar specimens than normal steel bar specimens.Increasing the concrete coverage thickness can improve the bond strength,but the effect is limited.The upsetting steel bar can effectively enhance the bond strength between steel bar and SFRC,significantly reduce the relative slip and change the failure pattern.In addition,based on the experimental data,the bond-slip relationship between normal/upsetting steel bar and SFRC is established.

关 键 词：黏结-滑移关系 墩粗钢筋 高强钢纤维混凝土 拔出试验 锚固长度 

分 类 号：TU375.1[建筑科学—结构工程]