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首页> 外文期刊>Construction and Building Materials >Effect of web reinforcement on the behavior of pultruded fiber-reinforced polymer beams subjected to concentrated loads
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Effect of web reinforcement on the behavior of pultruded fiber-reinforced polymer beams subjected to concentrated loads

机译：腹板增强对拉挤纤维增强聚合物梁在集中载荷下的性能的影响

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摘要

This paper describes an experimental program designed and executed to investigate the failure mode and ultimate capacity of web-reinforced pultruded FRP beams subjected to concentrated loads in the plane of the web. Six 203.2 mm × 101.6 mm × 12.7 mm beams and five 203.2 mm × 203.2 mm × 9.5 mm beams manufactured with vinylester resin were strengthened with one of three systems and subjected to concentrated loads applied directly to the top flange. The three systems were (a) full-depth web bearing stiff-eners, (b) "doubler" plates attached to the web, or (c) stiffening elements applied to the upper (loaded) web-flange junction of the specimen. Experimental results showed that the junction stiffeners (58.7%), bearing stiffeners (52.8%), and "doubler" plates (31.7%) all increased the ultimate capacity of the beams when compared to unstrengthened control beams. Beams prepared with bearing stiffeners and "doubler" plates failed in the same manner as the control beams (shear "wedge" failure at loaded web-flange junction), while failure in the beams with reinforced loaded web-flange junctions occurred in the bottom flange near the simple supports. Digital image correlation software was used to capture out of plane displacement of the web and confirms the modes of failure.
机译：本文介绍了一个设计并执行的实验程序，以研究在腹板平面内承受集中载荷的腹板增强拉挤FRP梁的破坏模式和极限承载力。用三个系统之一加固了六个用乙烯基酯树脂制造的203.2 mm×101.6 mm×12.7 mm横梁和五个203.2 mm×203.2 mm×9.5 mm横梁，并直接施加了集中载荷到顶部法兰上。这三个系统是（a）全深度的腹板轴承加劲肋；（b）附着在腹板上的“倍增”板；或（c）施加到样品上部（加载的）腹板-法兰接合处的加强元件。实验结果表明，与未加强的控制梁相比，交界加劲肋（58.7％），承重加劲肋（52.8％）和“双层”板（31.7％）都增加了梁的极限承载力。用轴承加劲肋和“双重”板准备的梁以与控制梁相同的方式失效（在载荷腹板-法兰交界处发生剪切“楔形”破坏），而在载荷增强腹板-法兰交界处发生破坏的梁发生在底部翼缘中靠近简单的支撑。使用数字图像关联软件来捕获卷材的平面外位移，并确定故障的模式。

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