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Bond properties for plain bars in frost-damaged concrete

机译：冻害混凝土中普通钢筋的粘结性能

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摘要

The bond properties for plain bars in frost-damaged concrete under monotonic and reversed cyclic loading were investigated. Rapid freeze-thaw and the pull-out tests were carried out on the specimens with three kinds of concrete strength grade. The compressive strength of frost-damaged concrete and the bond stress-slip response of the specimens with different concrete strength grades and freeze-thaw cycles were obtained. The effect of concrete strength grade and of the freeze-thaw cycle on the bond behaviours between concrete and plain bars was studied. Results indicated that, with the increase in the number of freeze-thaw cycles, the bond strength, residual bond capacity, residual bond stress and the cyclic bond stress decreased while the peak slip increased, as well as there being a more obvious bond degradation rate for the specimens with the same concrete strength grade. For specimens subject to the same number of freeze-thaw cycles, the bond strength, residual bond capacity, residual bond stress and the cyclic bond stress increased with the increasing concrete strength grade. A bond-slip model for plain bars in frost-damaged concrete under monotonic and reversed cyclic loading is proposed, which can be used for performance evaluation of existing reinforced-concrete structures in cold areas.
机译：研究了在单调和反向循环荷载下，冻害混凝土中普通钢筋的粘结性能。对三种混凝土强度等级的试件进行了快速冻融和拉拔试验。得到了不同霜冻混凝土的抗压强度以及不同强度等级和冻融循环试件的粘结应力-滑移响应。研究了混凝土强度等级和冻融循环对混凝土与普通钢筋之间粘结性能的影响。结果表明，随着冻融循环次数的增加，粘结强度，残余粘结能力，残余粘结应力和循环粘结应力下降，峰滑移增大，粘结降解率更加明显。对于具有相同混凝土强度等级的试样。对于经受相同数量的冻融循环的试样，随着混凝土强度等级的提高，其粘结强度，残余粘结能力，残余粘结应力和循环粘结应力会增加。提出了单调和反复循环荷载作用下冻害混凝土中普通钢筋的粘结滑移模型，可用于寒冷地区现有钢筋混凝土结构的性能评估。

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  • 来源
    《Magazine of Concrete Research》 |2019年第18期|975-988|共14页
  • 作者

    Xu Shanhua; Nie Biao; Li Anbang;

  • 作者单位

    Xian Univ Architecture & Technol, Sch Civil Engn, Xian, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Civil Engn, Xian, Shaanxi, Peoples R China;

    Xian Univ Architecture & Technol, Sch Civil Engn, Xian, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bond; durability-related properties; modelling;

    机译：债券;耐久性相关的属性;建模;

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