摘要
为研究屈服后钢筋黏结锚固性能,采用钢筋表面开槽埋置电阻应变片的方法测量钢筋的应变分布,以钢筋强度等级、混凝土强度、钢筋直径、保护层厚度、配箍率、锚固长度等为变量,完成了15个梁端式黏结锚固试验.试验结果表明:钢筋屈服后,加载端相对滑移显著增加,钢筋屈服段黏结应力明显减小,最大屈服渗透深度与钢筋所受约束和钢筋直径等因素有关.基于试验结果,统计回归得到了钢筋屈服后加载端相对滑移计算公式;同时提出一种计算钢筋屈服后锚固长度的方法,能有效地计算钢筋屈服后锚固长度.
In order to study the bond anchorage properties of steel bars after yielding,the strain distribution of steel bars was measured by the method of slotted steel bar surface and embedded resistance strain gauge.A total of 15 beam end bond anchorage tests were carried out by taking the strength grade of steel bars,the strength of concrete,the diameter of steel bars,the thickness of the protective layer,the ratio of the hoop,and the anchorage length as vari⁃ables.The test results show that the relative slip of the loading end increases significantly after steel bar yield,the bond stress of the yielding section decreases significantly,and the maximum yield penetration depth is related to the constraint of the steel bar and the diameter of the steel bar.Based on the test results,the formula for calculating the relative slip of the loading end after yielding is obtained by statistical regression.At the same time,a calculation method of the anchorage length after steel bar yielding is proposed,which can effectively calculate the anchorage length after steel bar yielding.
作者
易伟建
郑明明
YI Weijian;ZHENG Mingming(Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第3期79-89,共11页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51878260)。
关键词
黏结强度
黏结滑移
屈服渗透
锚固长度
试验研究
bond strength
bond slip
yield penetration
anchorage length
experimental research
