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首页> 外文期刊>Magazine of Concrete Research >Multiple anchorage zones in fibre-reinforced polymer prestressed concrete structures
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Multiple anchorage zones in fibre-reinforced polymer prestressed concrete structures

机译：纤维增强聚合物预应力混凝土结构中的多个锚固区

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摘要

Corrosion in conventional steel-reinforced and prestressed concrete structures is a major durability concern within the construction industry. Fibre-reinforced polymer (FRP) materials have received widespread interest as an alternative material to steel. Due to the low stiffness of these materials in comparison with steel, it could be argued that concrete structures containing FRP should be prestressed. In doing so, this removes much of the strain capacity in the FRP, so that serviceability of the structure is ensured and efficient use is made of all materials. Although relevant research into FRP-prestressed concrete is well established, the area of anchorage zones has received very little attention. The current research concentrates on the behaviour of post-tensioned anchorage zones subject to multiple anchors, with the feasibility of adopting FRP bars as equilibrium reinforcement. Over 50 anchorage zone specimens have been tested, subject to multiple loads under a strip-loading condition. Specimens were loaded vertically through square bearing plates to represent post-tensioning action, and both aramid- and carbon-fibre-reinforced polymer (AFRP and CFRP, respectively) bars were used as reinforcement. Test results have been compared with predictions based on an existing design approach that has been modified for the case of FRP reinforcement. It has been found that the existing design approach is overly-conservative when low percentages of FRP reinforcement are adopted and appears to become unsafe when high percentages of FRP reinforcement are present within the specimens. Furthermore, it has been found that such FRP reinforcement generally has less of an influence on the ultimate load capacity than might have been expected at the outset. However, it provides both crack growth resistance and integrity of the anchorage zone. Moreover, the distance between the loading plates has a major influence on the cracking and ultimate load behaviour of anchorage zones.
机译：传统的钢筋和预应力混凝土结构中的腐蚀是建筑行业中主要的耐久性问题。作为钢的替代材料，纤维增强聚合物（FRP）材料已引起广泛关注。由于这些材料与钢相比刚度低，因此可以认为含FRP的混凝土结构应予预应力。这样做可以消除FRP的大部分应变能力，从而确保结构的可维修性，并有效利用所有材料。尽管已经对FRP预应力混凝土进行了相关研究，但是锚固区域的面积却很少受到关注。目前的研究集中在受多个锚固的后张锚固区域的行为，以及采用FRP筋作为平衡钢筋的可行性。已测试了50多个锚固区标本，在条形荷载条件下承受多重荷载。样品通过方形轴承板垂直加载以表示后张紧作用，芳纶和碳纤维增强聚合物（分别为AFRP和CFRP）棒材均用作增强材料。测试结果已与基于现有设计方法的预测进行了比较，该设计方法已针对FRP加固进行了修改。已经发现，当采用低百分比的FRP增强材料时，现有的设计方法过于保守，而当试样中存在高百分比的FRP增强材料时，这种设计方法似乎变得不安全。此外，已经发现，这种FRP加强件通常比一开始所预期的对极限承载力的影响较小。但是，它既提供了抗裂纹扩展性，又提供了锚固区的完整性。此外，承重板之间的距离对锚固区的开裂和最终荷载行为有重要影响。

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  • 来源
    《Magazine of Concrete Research》 |2005年第3期|p.149-165|共17页
  • 作者

    L. Gale; T. J. Ibell;

  • 作者单位

    Ashburton, 17 Hilary Street, St Helier, Jersey, JE4 8SJ, Channel Islands;

  • 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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