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首页> 外文期刊>Journal of materials in civil engineering >Expansive Grout-Based Gripping Systems for Tensile Testing of Large-Diameter Composite Bars
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Expansive Grout-Based Gripping Systems for Tensile Testing of Large-Diameter Composite Bars

机译：基于膨胀浆的抓取系统，用于大直径复合材料棒的拉伸测试

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摘要

Tensile and shear testing to final fracture of large-diameter, fiber-reinforced polymer (FRP) composite round bars is often challenging because local stress triaxiality near the gripping ends can precipitate premature failure at these locations, instead of in the desired test gauge section. A method using expansive grout materials has been used, though its design is impaired by the lack of understanding of the gripping pressure developed by the confined expansive grout material. In this paper, an analytical solution has been derived to correlate the hoop strain on the outer surface of the confining steel pipe (caused by grout expansion in the steel pipe) to the grout's elastic modulus and coefficient of linear expansion. By experimentally measuring the exterior surface hoop strains of two different steel pipes, the elastic modulus and coefficient of linear expansion were determined. This solution has been generalized to include the composite bar and predict the gripping pressure at the bar-grout interface for any given pipe and composite bar combination. Based on the analytical results, expressions for key design parameters for improved expansive grout-based gripping systems, including the minimum grip length, optimum dimensions of the confinement pipes, and minimum volume of the grout material, have been provided. Based on the improved design, glass FRP bars of diameters 19.0 to 38.0 mm (0.75 to 1.5 in.) were tested without gripping problems and with failure loads up to 534 kN (126 kip), which significantly exceeds 400 kN (90 kip), the load level identified as a threshold of concern.
机译：对大直径纤维增强聚合物（FRP）复合圆棒进行最终断裂的拉伸和剪切测试通常具有挑战性，因为在夹紧端附近的局部应力三轴性会导致这些位置处的过早失效，而不是在所需的测试规格部分。尽管缺乏对受限膨胀水泥浆材料产生的抓地力的理解，但是使用了使用膨胀水泥浆材料的方法，尽管其设计受到损害。在本文中，已经找到了一种解析方法，可以将约束钢管外表面上的环向应变（由钢管内的灌浆膨胀引起）与灌浆的弹性模量和线性膨胀系数相关联。通过实验测量两种不同钢管的外表面环向应变，确定了弹性模量和线性膨胀系数。该解决方案已被推广为包括复合杆，并针对任何给定的管道和复合杆组合预测杆灌浆界面处的夹持压力。根据分析结果，提供了用于改进的基于膨胀浆液的抓取系统的关键设计参数的表达式，包括最小的抓取长度，约束管道的最佳尺寸以及最小的灌浆材料体积。基于改进的设计，对直径为19.0至38.0毫米（0.75至1.5英寸）的玻璃纤维增​​强塑料棒进行了测试，没有夹持问题，并且破坏载荷高达534 kN（126 kip），大大超过了400 kN（90 kip），确定为关注阈值的负载水平。

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  • 来源
    《Journal of materials in civil engineering》 |2014年第2期|250-258|共9页
  • 作者

    D. Schesser; Q. D. Yang; A. Nanni; J. W. Giancaspro;

  • 作者单位

    Dept. of Mechanical and Aerospace Engineering, Univ. of Miami, Coral Gables, FL 33146;

    Dept. of Mechanical and Aerospace Engineering, Univ. of Miami, 1251 Memorial Dr., MEB 205, Coral Gables, FL 33146-0630;

    Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, Coral Gables, FL 33146 Dept. of Structural Engineering, Univ. of Naples, Naples, Italy;

    Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, Coral Gables, FL 33146;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Expansive grout; Glass fiber-reinforced polymer (GFRP); Tensile testing; Anchor; Grip;

    机译：膨胀水泥浆;玻璃纤维增​​强聚合物（GFRP）;拉伸试验;锚;握;

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