钢绞线与超高性能混凝土的锚固长度研究

轩帅飞; 郑辉; 梁雪娇

doi:10.13204/j.gyjz202003019

钢绞线与超高性能混凝土的锚固长度研究

doi: 10.13204/j.gyjz202003019

湖南工业大学土木工程学院, 湖南株洲 412007

基金项目:

国家自然科学基金资助项目（51608189）；湖南省自然科学基金资助项目（2019JJ40313，2019JJ50130）；交通基础设施安全风险管理行业重点实验室基金资助项目（长沙理工大学）（16KE01）。

详细信息

作者简介:
轩帅飞,男,1992年出生,硕士研究生。

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- 文章访问数: 80
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- 被引次数: 0
出版历程
- 收稿日期: 2019-07-16

RESEARCH ON ANCHORAGE LENGTH OF STEEL STRAND EMBEDDED IN ULTRA-HIGH-PERFORMANCE CONCRETE

College of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China

摘要

摘要: 通过12组（36个）钢绞线与超高性能混凝土（UHPC）黏性试件的中心拉拔试验，重点分析劈裂滑移破坏型试件在全过程中的破坏模式及作用机理，并探讨保护层厚度和锚固长度等参数对极限荷载的影响规律，通过最小二乘法拟合出保护层厚度为两倍钢绞线直径时的极限黏结强度与锚固长度的计算式。分析表明：钢绞线与UHPC之间黏结破坏时的裂纹数量和裂纹宽度明显较与普通混凝土之间的小；加入钢纤维可以遏制裂纹发展，提高劈裂强度；保护层厚度和锚固长度增加时极限荷载也增加，采用二次多项式拟合法得到了钢绞线在UHPC中的临界锚固计算式并建议锚固长度取为35d。
- 超高性能混凝土 /
- 黏结性能 /
- 破坏模式 /
- 临界锚固长度
Abstract: Through pull-out tests of 12 groups bonding specimens of steel strand and UHPC,the failure mode and mechanism of the slip-breaking specimen with splitting crack in the whole process were emphatically analyzed, and then the effects of protective layer thickness and anchorage length on ultimate load were discussed, whereafter, the formula for calculating the ultimate bond strength and anchor length when the thickness of the protective layer was 2 times the diameter of the steel strand was fitted by the least squares method. The results showed that the number of cracks and crack width between steel strand and UHPC were significantly less those that between steel strand and ordinary concrete on account of steel fiber which could restrain the crack development and increase the splitting strength of UHPC specimens.The ultimate load increased when the thickness of the protective layer and the anchorage length increased. The polynomial fitting method was used to obtain the critical anchoring formula of steel strand in UHPC, and the anchorage length was recommended to be 35d.
- UHPC /
- bonding properties /
- failure mode /
- critical anchorage length

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参考文献(14)

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