全螺纹高强锚栓锚固性能试验研究
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TU375.4

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国家自然科学基金(51408212);湖南省科技重大项目(2017SK1010);湖南省创新技术投资项目(2018GK5028)


Experimental investigation on bonding anchorage performance of full-thread high strength anchor bolt
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    摘要:

    为研究全螺纹高强锚栓的黏结锚固性能,以高强锚栓类型、高强锚栓直径d、锚固长度la及混凝土保护层厚度c为试验参数,进行了24组共计48个高强锚栓的拉拔试验。结果表明:端头高强锚栓较直高强锚栓可有效减小其所需的锚固长度。直高强锚栓黏结力主要集中在la=10d以内;增加c可以提高其锚固性能,增加la可以减小c对其黏结锚固性能的影响。混凝土的破坏程度和la直接影响高强锚栓受拉过程中能量转化和消耗。中国规范中有关锚栓锚固长度的设计方法过于保守。

    Abstract:

    To study the bond anchoring performance of full-thread high strength bolts, pull-out tests were carried out on forty-eight specimens in twenty-four groups, where the influential factors on bond anchorage capacity were considered, including the bolt type, bolt diameter d, the anchorage length la and the thickness of concrete cover c. The results show that the anchorage performance of straight high strength anchor bolts was lower than that of with head ones. The bond stress of straight high strength anchor bolt was mainly concentrated on the contact area within the anchorage length 10d. Its bonding performance increases with the thickness of concrete cover. However, increasing the anchorage length will reduce the influence of the thickness of concrete cover on the bonding property. The energy translation and dissipation of high strength anchor bolt under tension are influenced by the concrete failure pattern and anchorage length. Moreover, the calculation formula in the design codes provide over-conservative estimation for the critical anchorage length of anchor bolts.

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陈俊,蒋恩浩,刘艳芝,龙士国,杨才千,许福,张白.全螺纹高强锚栓锚固性能试验研究[J].土木与环境工程学报(中英文),2019,41(3):58-66. Chen Jun, Jiang Enhao, Liu Yanzhi, Long Shiguo, Yang Caiqian, Xu Fu, Zhang Bai. Experimental investigation on bonding anchorage performance of full-thread high strength anchor bolt[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2019,41(3):58-66.10.11835/j. issn.2096-6717.2019.050

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  • 收稿日期:2018-06-27
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  • 在线发布日期: 2019-06-03
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