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首页> 外文期刊>Magazine of Concrete Research >Bond between ribbed bars and concrete. Part 2: The effect of corrosion
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Bond between ribbed bars and concrete. Part 2: The effect of corrosion

机译：带肋钢筋与混凝土之间的粘结。第2部分：腐蚀的影响

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The corrosion products that form when reinforcement in concrete corrodes occupy a larger volume than the steel it was formed of, thus leading to splitting stresses acting on the concrete. Thereby, the bond between the reinforcement and the concrete is influenced. A model of the corrosion was developed by the author in earlier work. This was used together with a modified model of the bond mechanism, presented in a companion paper, in three-dimensional finite element analyses where both the reinforcement and the concrete were modelled with solid elements. Several corrosion cracking tests, beams and pull-out tests with corroded reinforcement, both with and without transverse reinforcement, carried out by various researchers, were analysed by using the corrosion model. The results were compared, and reasonably good agreement was found. Furthermore, the model was used to study the effect of uniform or localised corrosion. It was shown that for localised corrosion, less average corrosion penetration was needed to crack the cover than for uniform corrosion; in addition, the crack pattern differed. From these analyses, it was concluded that axisymmetric analyses appear to be a sufficient level of modelling when studying cracking due to uniform corrosion. If localised corrosion is to be studied, three-dimensional models need to be used. The model was also used to study the effect of uniform corrosion on the anchorage length when no transverse reinforcement is present. Under these circumstances, the criterion 'the anchorage of the reinforcement becomes critical when cracking of the cover occurs' was shown to be on the safe side to use.
机译：当钢筋腐蚀后形成的腐蚀产物所占的体积要比其所形成的钢材大，从而导致作用在混凝土上的分裂应力。由此，增强物与混凝土之间的结合受到影响。作者在较早的工作中开发了腐蚀模型。它与伴随论文中提出的改进的粘结机理模型一起用于三维有限元分析中，其中，钢筋和混凝土都使用实体元素进行建模。通过使用腐蚀模型，分析了由不同研究人员进行的几种腐蚀开裂试验，横梁和带锈蚀钢筋的横拉试验，无论有无横向钢筋。比较结果，并找到合理的一致性。此外，该模型还用于研究均匀腐蚀或局部腐蚀的影响。结果表明，对于局部腐蚀，与均匀腐蚀相比，使覆盖层开裂所需的平均腐蚀渗透更少。另外，裂纹模式也不同。从这些分析可以得出结论，当研究由于均匀腐蚀而产生的裂纹时，轴对称分析似乎是足够的建模水平。如果要研究局部腐蚀，则需要使用三维模型。该模型还用于研究不存在横向钢筋时均匀腐蚀对锚固长度的影响。在这种情况下，标准“加强筋的锚固在发生覆盖层破裂时变得至关重要”被证明是安全的。

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  • 来源
    《Magazine of Concrete Research》 |2005年第7期|p.383-395|共13页
  • 作者

    K. Lundgren;

  • 作者单位

    Department of Civil and Environmental Engineering, Division of Structural Engineering, Concrete Structures, Chalmers University of Technology, SE-412 96 Goteborg, Sweden;

  • 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 水泥工业;
  • 关键词

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