粘结消除对NSM CFRP加固破损无粘结预应力混凝土梁抗弯性能的影响

A. J. Daraj, A. H. Al-Zuhairi
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摘要

本文研究了U-CFRP包裹板锚固对未粘结后张预应力PC构件抗弯性能的影响,这些构件受到部分钢绞线损伤并使用CFRP近表面安装技术进行加固。该方案包括6根梁作为控制梁,1根梁的钢绞线损坏率为14.2%,4根梁采用NSM技术进行CFRP层合板加固,有和没有U-CFRP包板锚固。试验结果表明,14.2%的钢绞线损伤使梁的抗弯强度降低了5.71%。NSM-CFRP复合材料对抗弯强度的影响显著,提高了17.4%。另一方面,采用末端U-CFRP包板锚固提高了27.97%的抗弯强度和延性。中间和连续U-CFRP片材锚固的抗弯强度分别提高了36.56%和32.61%,增强了各加载阶段的刚度,提高了延性。开发了半经验方程来确定考虑u - frp包裹锚固物影响的未粘合链的实际应力。
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The Effect of Cohesive Debonding Elimination on Enhancing the Flexural Performance of Damaged Unbonded Prestressed Concrete Girders Strengthened Using NSM CFRP
This manuscript studied the effect of U-CFRP wrapped sheet anchorage on the flexural performance of unbonded post-tensioned PC members subjected to partial strand damage and strengthened using CFRP Near-Surface Mounting techniques. The program includes six girders as a control girder, a girder with strand damage of 14.2%, and four girders strengthened by CFRP laminates using the NSM technique with and without U-CFRP wrapped sheet anchorages. The testing results show that the strand damage of 14.2% has reduced the flexural strength of the girder by 5.71%. The NSM-CFRP laminate has a significant effect on flexural strength by 17.4%. On the other hand, the application of end U-CFRP wrapped sheet anchorages improves flexural strength by 27.97% and enhances ductility. The intermediate and successive U-CFRP sheet anchorages increase the flexural strength by 36.56% and 32.61%, enhancing the stiffness at all loading stages and improving the ductility. Semiempirical equations were developed to determine the actual stress of unbonded strands considering the effect of U-FRP-wrapped anchorages.   
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审稿时长
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