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首页 > 过刊浏览>2023年第26卷第9期 >1003-1010. DOI:10.3969/j.issn.1007-9629.2023.09.008
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墩粗钢筋在高强钢纤维混凝土中的黏结锚固性能
作者:
作者单位:

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

作者简介:

陈子璇（1996—），女，福建霞浦人，同济大学博士生.E-mail：1810761@tongji.edu.cn

通讯作者:

肖建庄（1968—），男，山东沂南人，同济大学教授， 博士生导师， 博士.E-mail：jzx@tongji.edu.cn

中图分类号:

TU375.1

基金项目:

国家自然科学基金资助项目（52078358）


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

1.College of Civil Engineering， Tongji University， Shanghai 200092， China;2.China Construction Fifth Engineering Division Co.， Ltd.， Changsha 410004， China

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    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.

    Abstract:

    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.

    表 1 HRB400钢筋的材料性能Table 1 Material property of HRB400 steel bar
    图1 试件设计Fig.1 Specimen design （size： mm）
    图2 试验加载装置Fig.2 Test loading device
    图3 试件破坏模式Fig.3 Failure patterns of specimens
    图4 各试件典型黏结-滑移曲线Fig.4 Typical bond-slip curves of each specimen
    图5 试件黏结强度与黏结长度的关系Fig.5 Relationship between bond strength and bond length of specimens
    图6 试件峰值滑移与黏结长度的关系Fig.6 Relationship between peak slip and bond length of specimens
    图7 试件黏结强度与保护层厚度的关系Fig.7 Relationship between bond strength and coverage thickness of specimen
    图8 试件峰值滑移与保护层厚度的关系Fig.8 Relationship between peak slip and coverage thickness of specimen
    图9 墩粗钢筋对试件峰值滑移的影响Fig.9 Effect of upsetting steel bar on peak slip of specimens
    图10 墩粗钢筋试件剪压破坏特征Fig.10 Splitting failure of specimen with upsetting steel bar
    图11 试件的黏结-滑移本构关系Fig.11 Bond-slip constitutive relationship of specimens
    表 2 SFRC的配合比Table 2 Mix proportion of SFRC
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陈子璇,李新星,肖建庄,陈宣言,李水生.墩粗钢筋在高强钢纤维混凝土中的黏结锚固性能[J].建筑材料学报,2023,26(9):1003-1010

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  • 收稿日期:2022-11-03
  • 最后修改日期:2023-01-16
  • 在线发布日期: 2023-10-10
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