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Performance evaluation of FRP bridge deck under shear loads.

机译：FRP桥面在剪力作用下的性能评估。

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摘要

Shear behavior of glass fiber reinforced polymer (FRP) composite coupons, components, and systems is studied under torsional shear, in-plane shear, racking shear, out-of-plane shear, punching shear, and shear of web-flange junction. In addition, local deflection including web buckling of different FRP deck types has been evaluated and reported. FRP composites have been tested under a wide range of shear load conditions and their data has been compared with theoretical evaluations. Experimental data revealed that the shear modulus of FRP bridge decks ranged from 0.25 to 0.5 msi, shear stress ranged from 3 to 12 ksi, while the shear strain to failure was about 10,000 microstrain. Experimental shear modulus under torsion and in-plane shear correlated well (10%) with the results from the Simplified Classical Lamination Theory (SCLT) and finite element method. In addition, in-plane shear strain based on SCLT, is found to be in good agreement with the experimental results for specific locations of a test specimen. It is found that plate action on torsional rigidity at system level after neglecting joint inefficiency (100% load transfer across joints) is found to be about 20.0% higher than in terms of a beam model. Moreover, plate action under torsion of refined model with joint efficiency (80% load transfer) is found to be 6%, different from the case where 100% load transfer across a joint is assumed.; A theoretical model based on specific types of FRP deck specimens for predicting punching shear capacity is proposed and validated through our experimental data. In addition, failure modes of test specimens are reported. To study the web-flange junction behavior, both open and closed FRP sections are tested under shear-bending effect. It is clear that the web-flange junction shear strength is only one half of the shear strength obtained from flange specimens under V-notched beam tests. The failure modes of both open and closed sections are similar. Cracks and layer delamination around web-flange junctions are found and extended along the thickness of the web portion with increasing applied loads leading to web shear-off failure. (Abstract shortened by UMI.)
机译：研究了玻璃纤维增​​强聚合物（FRP）复合试样，组件和系统的剪切行为，包括扭转剪切，平面内剪切，齿条剪切，平面外剪切，冲压剪切和腹板-法兰连接处的剪切。另外，已经评估并报告了包括不同FRP甲板类型的腹板屈曲在内的局部挠度。 FRP复合材料已在各种剪切载荷条件下进行了测试，并将其数据与理论评估进行了比较。实验数据表明，FRP桥面板的剪切模量为0.25至0.5 msi，剪切应力为3至12 ksi，而破坏时的剪切应变约为10,000微应变。扭转和平面内剪切下的实验剪切模量与简化经典层压理论（SCLT）和有限元方法的结果具有良好的相关性（<10％）。此外，发现基于SCLT的面内剪切应变与测试样品特定位置的实验结果非常吻合。发现在忽略关节效率低下（跨关节的100％载荷传递）后，板在系统水平上对扭转刚度的作用比梁模型高约20.0％。此外，发现在精细模型的扭转作用下，具有联合效率（80％载荷传递）的板作用为6％，这与假定跨接头进行100％载荷传递的情况不同。提出并基于我们的实验数据验证了基于特定类型的FRP甲板样本的理论模型来预测冲压剪切能力。另外，报告了试样的破坏模式。为了研究腹板-法兰的连接行为，在剪切弯曲作用下测试了开放式FRP和封闭式FRP截面。显然，腹板-法兰连接处的抗剪强度仅为在V型缺口梁测试下从法兰试样获得的抗剪强度的一半。打开和关闭部分的故障模式相似。发现腹板-法兰连接处周围出现裂纹和分层，并随着腹板厚度的增加而扩展，从而导致腹板剪切失败。 （摘要由UMI缩短。）

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  • 作者

    Prachasaree, Woraphot.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 411 p.
  • 总页数 411
  • 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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