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Using carbon fiber reinforced polymer grids as confinement reinforcement for concrete.

机译：使用碳纤维增强的聚合物网格作为混凝土的约束加强。

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摘要

Prestressed concrete piles are widely used in marine environments to support docks, piers, bridges and other waterfront structures. Corrosion of the reinforcement caused by the penetration of the sea salts through the concrete can cause severe deterioration. Corrosion eventually forces replacement of the pile and the structure it supports.; Carbon fiber reinforced polymer (CFRP) reinforcement has been researched for a number of years as a potential replacement for steel reinforcement. The significant advantage that CFRP reinforcement holds over steel is that it is highly resistant to deterioration in a harsh marine environment. One of the primary reasons, however, that the CFRP reinforcement has not seen wider use is its lack of ductility.; Rather than attempting to improve the CFRP ductility, which is very difficult to do, the primary focus of the research reported in this dissertation was to improve the member flexural ductility by confining the concrete in the compression zone. For that purpose a CFRP grid has been investigated for use as confinement reinforcement in FRP reinforced concrete members.; The grid was used in different configurations to confine concrete in the compression zone and improve flexural member ductility. The grid was used to confine concrete cylinders that were tested in axial compression. The results showed a significant increase in the ultimate axial strain of the CFRP confined concrete of approximately 100%. Another application of the grid was the embedment of grid tubes in the compression zone of beams that resulted in an improvement of the ductility factors of approximately 20%. The grid was also used to fully wrap concrete piles that were cast in place or spun cast. The ductility of the piles was improved by as much as 20%.; Therefore improvement of the member flexural ductility by confining the concrete in the compression zone is feasible. However the improvement in the ductility of the concrete elements was not enough to compare favorably with the ductility of steel reinforced concrete member. More improvement is required for the FRP reinforced members to be accepted and used to replace steel reinforced members.
机译：预应力混凝土桩在海洋环境中广泛用于支撑码头，码头，桥梁和其他滨水结构。海盐穿过混凝土的渗透引起的钢筋腐蚀会严重恶化。腐蚀最终迫使更换桩及其支撑的结构。碳纤维增强聚合物（CFRP）增强材料已经进行了多年研究，可以替代钢增强材料。 CFRP增强材料比钢材具有更大的优势在于，它在恶劣的海洋环境中具有很高的抗劣化能力。然而，CFRP增强材料尚未得到广泛使用的主要原因之一是其缺乏延展性。而不是试图提高CFRP的延性，这是很难做到的，本论文报道的研究的主要重点是通过将混凝土限制在压缩区内来提高构件的挠曲延性。为此，已经研究了CFRP网格作为FRP钢筋混凝土构件中的约束钢筋。网格用于不同的配置，以将混凝土限制在压缩区域中并提高抗弯构件的延展性。网格用于限制经过轴向压缩测试的混凝土圆柱体。结果表明，CFRP约束混凝土的极限轴向应变显着提高了约100％。网格的另一个应用是将网格管嵌入梁的压缩区域，从而将延性因子提高了约20％。网格还用于完全包裹在现场浇铸或旋转浇铸的混凝土桩。桩的延展性提高了20％。因此，通过将混凝土限制在压缩区内来改善构件的挠曲延展性是可行的。然而，混凝土元件的延展性的改善不足以与钢筋混凝土构件的延展性相比。 FRP增强构件需要接受更多的改进，以替代钢增强构件。

著录项

  • 作者

    Michael, Antonis Petrou.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 213 p.
  • 总页数 213
  • 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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