【摘要】 目的 研究HRB635级高强钢筋与C70高强混凝土之间黏结锚固性能，为工程应用提供参考。方法 设计制作了5组45个直锚试件进行拉拔试验，分析了锚固长度、配箍率、混凝土保护层厚度等因素对锚固性能的影响。结果 试件极限承载力随配箍率和锚固长度的增加而增加，但当箍筋率ρ_sv大于1.26%,锚固长度l_a大于15d后，配箍率和锚固长度的增加不再对试件极限承载力产生明显的影响；对于未配置箍筋的试件，当试件保护层厚度从2d增加到3d时，试件极限承载力随着保护层厚度的增加而增加，但当保护层厚度大于3d后，保护层厚度的增加对试件极限承载力基本没有影响。结论 在进行HRB635级高强钢筋和C70高强混凝土试件设计时，锚固长度可按《混凝土结构设计规范》（GB 50010—2010）中相关公式进行计算，且具有足够的安全储备。更多还原

【Abstract】 The bond anchorage performance between HRB635 high strength steel bar and C70 high strength concrete is studied to provide reference for engineering application.Pull-out tests were carried out on 5 groups of 45 bond-anchoring specimens with different anchorage length, stirrup ratio and concrete cover thickness, and the influence of each parameter variable on the bond performance of steel bar and recycled concrete was analyzed.The results show that for the specimens with stirrups, the increase of stirrup ratio and anchorage length of steel bars will lead to the increase of ultimate bearing capacity of the specimens.However, when stirrup ratio ρ_sv is not less than 1.26% and the anchorage length l_a is not less than 15d,the increase of stirrup ratio and anchorage length has no obvious effect on the increase of ultimate bearing capacity of the specimen.For the specimen without stirrups, when the thickness of the protective layer of the specimen increases from 2d to 3d,the increase of the thickness of the concrete protective layer has a significant effect on the increase of the ultimate bearing capacity, but when the thickness of the protective layer c is greater than 3d,the increase of the thickness of the protective layer has no effect on the ultimate bearing capacity of the specimen.For HRB635 grade high strength steel bar anchorage specimens, when the concrete strength reaches C70,the anchorage length can be designed according to the relevant formula of anchorage length in the Code for Design of Concrete Structures（GB 50010-2010）,and has sufficient safety reserve.更多还原