Abstract Shear capacity of unbonded post-tensioned concrete T-beams strengthened with CFRP and GFRP U-wraps
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Shear capacity of unbonded post-tensioned concrete T-beams strengthened with CFRP and GFRP U-wraps

机译：CFRP和GFRP U型卷材增强了无粘结后张混凝土T形梁的抗剪能力

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摘要

AbstractExisting codes and design guidelines have not mentioned a procedure to calculate the shear resistance of unbonded post-tensioned concrete beams strengthened with fiber reinforced polymer (FRP) sheets. Up to date, the number of studies about the shear behaviour of post-tensioned concrete beams strengthened with FRP sheets in shear is very limited, particularly for unbonded post-tensioned beams. The effect of many factors on the shear resistance of such the beams has not been well investigated, for example, fiber factors (the type of fiber, the strengthening scheme, and the number of layers), the concrete strength, and the ratio of the shear span to effective depth. The study deals with the shear behaviour of unbonded post-tensioned beams strengthened with FRP U-wraps. The experiment consists of twenty-two post-tensioned beams with T section and unbonded tendons. The variables include concrete strength, number of FRP layers, FRP U-wraps scheme (continuous and spaced), types of FRP, and varied shear span to effective depth. The experimental results have shown that the FRP shear strengthening is more effective with higher concrete strength. The number of FRP layers, strengthening scheme, and type of FRP have a slight influence on the shear resistance of the beams but they significantly affect the ultimate deformation of the FRP sheets. The efficiency of FRP U-wraps considerably reduces with a reduction of the shear span to effective depth. As a result, the existing design guides may not yield reliable predictions since they have not considered this ratio. Moreover, a semi-empirical model is proposed to predict the shear resistance of unbonded post-tensioned beams strengthened with FRP U-wraps. The predictions from the proposed model fit well with the experimental results from other studies.
机译： 摘要 现有规范和设计准则并未提及计算纤维增强聚合物加固的未粘结后张混凝土梁抗剪强度的程序（ FRP）工作表。迄今为止，关于用FRP片加固的后张混凝土梁的抗剪性能的研究数量非常有限，特别是对于未粘结的后张梁。尚未充分研究许多因素对此类梁的抗剪强度的影响，例如，纤维因素（纤维类型，加固方案和层数），混凝土强度以及所占比例。剪切跨度到有效深度。这项研究涉及的是FRP U型包裹加固的无粘结后张梁的剪力特性。该实验由22个T形截面且无粘结筋的后张梁组成。这些变量包括混凝土强度，FRP层数，FRP U形包装方案（连续的和间隔的），FRP的类型以及到有效深度的不同剪力跨度。实验结果表明，FRP剪力增强具有较高的混凝土强度。 FRP的层数，加固方案和FRP的类型对梁的抗剪力有轻微的影响，但会显着影响FRP板的最终变形。 FRP U形包装的效率随着剪切跨度减小到有效深度而大大降低。结果，现有的设计指南可能没有得出可靠的预测，因为他们没有考虑该比率。此外，提出了一个半经验模型来预测FRP U形包裹层加固的无粘结后张梁的抗剪强度。所提出的模型的预测与其他研究的实验结果非常吻合。

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  • 来源
    《Composite Structures》 |2018年第1期|1011-1029|共19页
  • 作者

    Long Nguyen-Minh; Dien Vo-Le; Duong Tran-Thanh; Thong M. Pham; Chinh Ho-Huu; Marián Rovňák;

  • 作者单位

    Department of Structural Design, Faculty of Civil Engineering, HCMC University of Technology,Faculty of Civil Engineering, Technical University of Košice;

    Department of Structural Design, Faculty of Civil Engineering, HCMC University of Technology;

    BK Structural Engineering Lab, Faculty of Civil Engineering, HCMC University of Technology;

    Department of Structural Design, Faculty of Civil Engineering, HCMC University of Technology,Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University;

    Department of Structural Design, Faculty of Civil Engineering, HCMC University of Technology;

    Department of Masonry and Concrete Structures, Faculty of Civil Engineering;

    Technical University of Košice;

  • 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
  • 关键词

    Concrete strength; Shear span; Fabric-epoxy U-wrap; Unbonded tendons; Post-tensioned beam; Shear capacity; Formula;

    机译：混凝土强度;剪力跨度;织物-环氧树脂U形包裹;无粘结筋;后张梁;抗剪承载力;公式;

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