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首页> 外文学位 >Behaviour of restrained concrete bridge deck slabs reinforced with FRP reinforcing bars under concentrated loads.
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Behaviour of restrained concrete bridge deck slabs reinforced with FRP reinforcing bars under concentrated loads.

机译：FRP钢筋加固的约束混凝土桥面板在集中荷载下的性能。

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摘要

While the expansive corrosion of steel reinforcement is a major concern in reinforced concrete bridge deck slabs, the non-corrosive fibre reinforced polymer (FRP) composite bars provide an excellent alternative reinforcement. This thesis investigates the behaviour of restrained concrete bridge deck slabs reinforced with different types and ratios of FRP reinforcing bars under static loading conditions. The research includes two different phases; experimental and theoretical investigations. In the experimental phase, nine full-scale deck slabs 3000-mm long × 2500-mm wide × 200-mm deep were constructed and tested to failure. Five deck slabs were reinforced with glass FRP bars, two deck slabs were reinforced with carbon FRP bars, one deck slab was reinforced with steel bars, and the last deck slab was constructed without any reinforcement (plain concrete). The deck slabs were supported on two steel girders spaced at 2000-mm centre-to-centre and were subjected to a monotonic single concentrated load over a contact area of 600 mm x 250 mm to simulate the foot print of a sustained truck wheel load (87.5 kN - CL-625 Truck) acting on the centre of each slab. The experimental results were presented in terms of cracking, deflection, strains in concrete and reinforcement, ultimate capacity and mode of failure. It was observed that the mode of failure for all reinforced deck slabs was punching shear with carrying capacities of more than three times the design factored load specified by the Canadian Highway Bridge Design Code (CHBDC). It was also concluded that the maximum measured crack widths and deflections at service load level were below the allowable code limits.;The theoretical phase has two parts. The first part includes developing a finite element model (FEM) to analyze and predict the behaviour of bridge deck slabs reinforced with FRP reinforcement. The efficiency and accuracy of the computer model was verified by comparing its results to the experimental results. Then the FEM was used to conduct a parametric study on the most important parameters that are known to affect the behaviour of the deck slabs. In addition the finite element program was used to analyze a typical concrete bridge reinforced with GFRP bars. The second part of the theoretical phase includes developing a new punching shear model to predict the punching shear capacity of FRP-reinforced concrete bridge deck slabs. The proposed model can predict with good accuracy the punching capacity of FRP-reinforced bridge deck slabs as well as FRP-reinforced two way slabs. In addition, the proposed model gives better predictions compared to the different available punching shear models.
机译：尽管钢筋混凝土的膨胀腐蚀是钢筋混凝土桥面板中的主要问题，但非腐蚀性纤维增强聚合物（FRP）复合钢筋可提供出色的替代钢筋。本文研究了不同类型和比例的FRP钢筋在静态荷载条件下的约束混凝土桥面板的性能。研究包括两个不同的阶段。实验和理论研究。在实验阶段，建造了9个3000毫米长×2500毫米宽×200毫米深的全尺寸甲板平板，并测试了其破坏能力。用玻璃纤维增​​强筋加固了五个甲板板，用碳纤维增强筋加固了两个甲板板，用钢筋加固了一个甲板板，最后一个建造的甲板没有任何加固（普通混凝土）。甲板平板支撑在两个钢梁上，钢梁的中心距为2000 mm，并在600 mm x 250 mm的接触面积上承受单调的单一集中载荷，以模拟持续承受卡车车轮载荷的足迹（ 87.5 kN-CL-625卡车）作用在每个平板的中心。实验结果以开裂，挠度，混凝土和钢筋中的应变，极限承载力和破坏方式表示。观察到，所有加固甲板板的破坏模式都是冲剪，其承载能力是加拿大公路桥梁设计规范（CHBDC）规定的设计因素载荷的三倍以上。得出的结论是，在使用载荷水平下测得的最大裂纹宽度和挠度均低于允许的规范极限。理论阶段分为两部分。第一部分包括开发有限元模型（FEM），以分析和预测用FRP加固的桥面板的性能。通过将其结果与实验结果进行比较，验证了计算机模型的效率和准确性。然后使用有限元法对已知会影响甲板平板性能的最重要参数进行参数研究。此外，有限元程序还用于分析由GFRP筋加固的典型混凝土桥梁。理论阶段的第二部分包括开发新的冲切剪切模型，以预测FRP增强的混凝土桥面板的冲切剪切能力。所提出的模型可以很好地预测玻璃纤维增​​强的桥面平板以及玻璃纤维增​​强的双向板的穿孔能力。此外，与不同的可用冲切剪切模型相比，该模型提供了更好的预测。

著录项

  • 作者

    El-Gamal, Sherif.;

  • 作者单位

    Universite de Sherbrooke (Canada).;

  • 授予单位 Universite de Sherbrooke (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 227 p.
  • 总页数 227
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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