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Hybrid members employing FRP skin reinforcement for beams and cladding wall applications.

机译：混合构件采用FRP蒙皮加固，用于梁和覆层墙应用。

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摘要

This thesis explores two hybrid systems employing a core material reinforced by an external skin, namely, cladding walls composed of polyurethane foam core sandwiched between fibre-reinforced polymer (FRP) skins, and beams composed of concrete-filled FRP or steel tubes. The walls were studied in two phases. In phase I, the polyurethane foam core was injected between two carbon-FRP (CFRP) skins. Ten panels were tested to investigate their structural performance and failure modes. Test parameters included quality control in terms of reproducibility of test results, moment-shear ratio, and the orientation of an architectural masonry-like coating. The study showed that design is governed by stiffness and not strength and that the CFRP was underutilized. Also, quality control was shown to be poor for this method of fabrication. As such, in phase II, ten panels were fabricated by laminating glass-FRP (GFRP) skins to prefabricated polyurethane foam blocks. Similar flexural testing was carried out to investigate two different densities of foam, and moment-shear ratio. The study showed evidence of high quality control and that the density of the foam core significantly affected flexural capacity and stiffness.;Rectangular concrete-filled tubes (CFTs), with either steel or pultruded GFRP tubes were fabricated and tested as beams in three-point bending, at different shear span-to-depth (a/d) ratios of 1 to 5 to examine crack patterns, strength and failure modes. It was shown that the critical (a/d) ratio, at which moment capacity drops, is between 4 and 5 for CFTs with GFRP tubes and between 1 and 2 for CFTs with steel tubes. It was also shown that ductility is drastically reduced at (a/d) ratios below 3 for steel tubes. Crack pattern and size were highly dependent on the magnitude of slip between the concrete and tube. A major full depth flexural crack developed in all CFTs with GFRP tubes. However, when Abstract internal steel rebar was added, major diagonal cracks were formed in addition to fine flexural cracks. In CFTs with steel tubes, fine flexural cracks developed, except at a/d = 1, where fine diagonal cracks were predominant. A strut-and-tie model was developed and provided reasonable agreement with test results.
机译：本文探讨了两种混合系统，它们使用由外部蒙皮增强的芯材，即由聚氨酯泡沫芯构成的包层壁夹在纤维增强聚合物（FRP）蒙皮之间，而梁由混凝土填充的FRP或钢管组成。墙壁分两个阶段进行研究。在阶段I中，将聚氨酯泡沫芯注入两个碳FRP（CFRP）蒙皮之间。测试了十个面板以研究其结构性能和破坏模式。测试参数包括根据测试结果的可重复性，弯矩剪切比和建筑砌体涂层的方向进行质量控制。研究表明，设计是由刚度而非强度决定的，并且CFRP未被充分利用。同样，对于这种制造方法，质量控制也很差。因此，在阶段II中，通过将玻璃纤维增​​强玻璃（GFRP）蒙皮层压到预制的聚氨酯泡沫块上，制造了十块面板。进行了类似的弯曲试验，以研究两种不同的泡沫密度和弯矩剪切率。这项研究表明了高质量控制的证据，并且泡沫芯的密度显着影响了挠曲能力和刚度。；制造了钢管或拉制GFRP管的矩形混凝土填充管（CFT），并作为三点梁进行了测试在不同的剪切跨度与深度（a / d）之比为1到5的情况下弯曲，以检查裂纹模式，强度和破坏模式。结果表明，对于容量为GFRP的CFT，临界容量的比率（a / d）在瞬间降低，在CFT的4至5之间，对于钢管的CFT的临界（a / d）在1至2之间。还表明，钢管的（a / d）比低于3时，延展性急剧降低。裂缝的形态和大小在很大程度上取决于混凝土和管材之间的滑动程度。使用GFRP管的所有CFT中都出现了主要的全深度挠曲裂纹。但是，当添加抽象内部钢筋时，除了细微的弯曲裂纹外，还形成了主要的对角裂纹。在带有钢管的CFT中，除了a / d = 1处（主要是细斜裂纹）以外，都出现了细微的挠曲裂纹。开发了拉杆-拉杆模型，并与测试结果提供了合理的一致性。

著录项

  • 作者

    Shawkat, Waleed.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Engineering Civil.
  • 学位 M.Sc.
  • 年度 2009
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:38:28

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