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首页> 外文期刊>Magazine of Concrete Research >Bond behaviour between corroded steel bars and concrete under different strain rates
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Bond behaviour between corroded steel bars and concrete under different strain rates

机译：不同应变率下锈蚀钢筋与混凝土之间的粘结性能

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摘要

The impressed current method was used to produce 42 corroded reinforced concrete specimens. Pull-out tests were conducted to study the effects of strain rate, corrosion degree, concrete cover and stirrups on the bond behaviour between corroded rebars and concrete. The results showed that the lag effect of radial cracking in concrete will occur with increasing strain rate. The failure modes of the specimens changed from splitting of the concrete cover to pullout failure of rebars, and the bond strength of the splitting specimens increased significantly as the rebars were loaded at a higher rate. The bond strength of corroded specimens decreased with the development of reinforcement corrosion under both static and dynamic loading. Coupling effects of corrosion degree and strain rate on bond strength were found. The degradation trend caused by corrosion decreased with increasing strain rate, and the effect of strain rate on the ultimate bond strength also decreased with an increasing degree of corrosion. In addition, specimens with smaller diameter rebars, a thicker concrete cover and stronger stirrups exhibited higher bond strength. Considering the effects of strain rate and corrosion, a model is proposed to predict the bond behaviour between corroded rebars and concrete under different strain rates.
机译：施加电流法用于生产42个腐蚀的钢筋混凝土试样。进行拉拔试验以研究应变率，腐蚀程度，混凝土覆盖层和箍筋对锈蚀钢筋与混凝土之间粘结性能的影响。结果表明，随着应变速率的增加，混凝土产生径向裂纹的滞后效应。试件的破坏模式从混凝土表层的分裂到钢筋的拔出破坏，随着钢筋加载的增加，分裂试件的粘结强度显着提高。在静态和动态载荷下，腐蚀试样的结合强度都随着增强腐蚀的发展而降低。发现腐蚀程度和应变速率对结合强度的耦合作用。腐蚀引起的降解趋势随应变速率的增加而降低，应变速率对极限结合强度的影响也随腐蚀程度的增加而降低。此外，具有较小直径钢筋，较厚的混凝土覆盖层和较强的箍筋的试样表现出较高的粘结强度。考虑到应变速率和腐蚀的影响，提出了一个模型来预测不同应变速率下锈蚀钢筋与混凝土之间的粘结性能。

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  • 来源
    《Magazine of Concrete Research》 |2016年第8期|364-378|共15页
  • 作者

    Zhang Wei-Ping; Chen Hui; Gu Xiang-Lin;

  • 作者单位

    Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Dept Struct Engn, Shanghai 200092, 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
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