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首页> 外文期刊>Engineering Structures >Performance of reinforced concrete T beams strengthened with flexural CFRP sheets and secured using CFRP splay anchors
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Performance of reinforced concrete T beams strengthened with flexural CFRP sheets and secured using CFRP splay anchors

机译：挠性CFRP板加固并使用CFRP斜撑锚固的钢筋混凝土T梁的性能

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The use of carbon fiber reinforced polymer (CFRP) anchors has been shown to improve the performance of reinforced concrete (RC) beams strengthened in flexure with CFRP sheets. This improvement results from delaying or controlling the debonding of FRP sheets at failure. In this study, five full-scale T beams were prepared and tested to quantify the flexural enhancement of CFRP anchored beams. The first T-beam was tested as a control beam and the remaining specimens were strengthened with four identical layers of CFRP sheets while applying different splay anchorage arrangements. The second T-beam was anchored with 12 anchors of 16 mm diameter at 140 mm spacing along each shear span. The third T-specimen was secured using 9 anchors of 19 mm diameter positioned at 203 mm spacing per shear span. Four CFRP anchors, with a diameter of 16 mm, were used to secure the CFRP sheets in the fourth T-specimen. These anchors were spaced at 406 mm on center per shear span. The last T-beam was anchored utilizing only one CFRP anchor of 16 mm diameter at the ends of the CFRP sheets. The experimental testing results show that by bonding flexural CFRP sheets with CFRP anchors, the flexural capacity of the RC T-beams significantly improves. This enhancement increases as the number and fiber content of the CFRP anchors increase until attaining the full sectional capacity. Furthermore, the more closely spaced the anchors, the higher the ultimate load level achieved.
机译：碳纤维增强聚合物（CFRP）锚的使用已显示出可改善CFRP板在弯曲状态下增强的钢筋混凝土（RC）梁的性能。这种改进是由于延迟或控制失效时FRP板的剥离而导致的。在这项研究中，准备并测试了五个全尺寸T型梁，以量化CFRP锚固梁的抗弯强度。第一个T形梁作为控制梁进行了测试，其余样品用四层相同的CFRP板层加固，同时采用了不同的张开锚固布置。第二个T型梁沿每个剪切跨段以140 mm的间距用12个直径16 mm的锚钉锚固。使用9个直径为19 mm的锚固件固定第三个T形试样，每个锚固间距为203 mm。使用四个直径为16 mm的CFRP锚固件将CFRP板固定在第四个T形试样中。这些锚在每个剪切跨度的中心间隔为406 mm。最后的T形梁仅在CFRP板的末端使用直径为16 mm的一个CFRP锚钉锚固。实验测试结果表明，通过将挠性CFRP薄板与CFRP锚固粘结在一起，RC T梁的挠曲能力显着提高。随着CFRP锚固件的数量和纤维含量的增加，这种增强作用会增加，直到达到完整的截面能力为止。此外，锚间距越近，获得的极限载荷水平越高。

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