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Bond of reinforcement in self-compacting steel-fibre-reinforced concrete

机译:自密实钢纤维增强混凝土中的增强粘结

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摘要

Crack control, one of the main benefits of using fibre reinforcement, depends to a large extent on the concrete-rebar bond. Pull-out tests of specimens with short embedment length were carried out and the results showed no effect from the fibres on the normalised bond-slip behaviour before peak load. After this, the fibre reinforcement provided extra confinement, changing the failure mode from splitting to pull-out failure. The test results were used to calibrate a finite-element bond model that considers both tangential stresses and stresses in the radial direction from the rebar. Splitting cracks may be thus considered in the finite-element analyses. The model proved to yield results in good agreement with the experimental results regarding failure mode, load-slip relation and splitting strains on the surfaces of the pull-out specimens. The analyses revealed that two types of action were active in the cracking process. In addition, the confinement effect of the fibre reinforcement was compared with the confinement of conventional stirrups using the bond model in CEB-FIP model code 2010.
机译:裂缝控制是使用纤维增强材料的主要好处之一,在很大程度上取决于混凝土与钢筋的粘结。进行了短埋入长度试样的拉拔试验,结果表明在峰值载荷之前,纤维对规范化的粘结滑移行为没有影响。此后,纤维增强材料提供了更多的限制,将破坏模式从劈裂转变为拉出破坏。测试结果用于校准有限元粘结模型,该模型同时考虑了切向应力和来自钢筋的径向应力。因此,在有限元分析中可以考虑产生裂痕。证明该模型产生的结果与关于失效模式,载荷-滑动关系和拉出试样表面上的分裂应变的实验结果非常吻合。分析表明,在裂解过程中有两种类型的作用。另外,使用CEB-FIP型号代码2010中的bond模型,将纤维增强材料的约束效果与常规箍筋的约束效果进行了比较。

著录项

  • 来源
    《Magazine of Concrete Research》 |2012年第7期|p.617-630|共14页
  • 作者单位

    Chalmers University of Technology, Goeteborg, Sweden;

    Chalmers University of Technology, Goeteborg, Sweden;

    Chalmers University of Technology, Goteborg,Sweden;

    Chalmers University of Technology, 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
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