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Bond strength of deformed reinforcing bars in plain high-strength concrete and high-strength steel fibre-reinforced concrete.

机译:普通高强度混凝土和高强度钢纤维增强混凝土中变形钢筋的粘结强度。

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摘要

Rapid splitting bond failures associated with high strength concrete (HSC) can be prevented with the addition of a confinement mechanism such as transverse reinforcing or fibre reinforcing. Furthermore, the addition of fibers results in a reduction in bar stress since the concrete below the neutral axis is capable of carrying some tension. To date, most studies of bond behaviour in fibre reinforced concrete (FRC) have not accounted for concrete tension below the neutral axis.; In this study 16 full scale (3 meters long) spliced-beam specimens are evaluated under third point loading with bars spliced in the central zone of pure flexure. Of these specimens, 9 were cast with normal high strength concrete (HSC) and 7 were cast using high strength steel fibre reinforced concrete (HS-SFRC). The fibres used are Dramix RC-80/60-BP high tensile steel fibres for high strength concrete at a dosage of 60 kg/m3. Spliced longitudinal reinforcing bars used in this study have normal relative rib areas and are of size 15M, 20M and 25M. Minimum transverse reinforcing stirrups are provided along the splice in 5 of the plain HSC specimens and in 4 of the FRC specimens. (Abstract shortened by UMI.)
机译:通过添加诸如横向加强或纤维加强的约束机制,可以防止与高强度混凝土(HSC)相关的快速开裂粘结失效。此外,由于中性轴下方的混凝土能够承受一定的张力,因此添加纤维可以减少钢筋应力。迄今为止,大多数纤维增强混凝土(FRC)粘结性能的研究都没有考虑到混凝土中性轴以下的张力。在这项研究中,在第三点荷载下使用纯弯曲中心区域的钢筋进行了评估,评估了16个全尺寸(3米长)的拼接梁样本。在这些试样中,有9个是用普通高强度混凝土(HSC)浇铸的,而7个是用高强度钢纤维增强混凝土(HS-SFRC)浇铸的。所使用的纤维是用于高强度混凝土的Dramix RC-80 / 60-BP高强度钢纤维,用量为60 kg / m3。本研究中使用的拼接纵向钢筋具有正常的相对肋骨面积,尺寸为15M,20M和25M。在5个普通HSC标本和4个FRC标本中,沿着接头提供了最小的横向加强箍筋。 (摘要由UMI缩短。)

著录项

  • 作者

    Berube, Frederic-Simon.;

  • 作者单位

    University of New Brunswick (Canada).;

  • 授予单位 University of New Brunswick (Canada).;
  • 学科 Engineering Civil.
  • 学位 M.Sc.E.
  • 年度 2003
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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