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梯度锚固预应力NSM CFRP加固 RC梁静力及疲劳性能研究
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Study on Monotonic and Fatigue Behavior of RC Beams Strengthened with Gradually Anchored Prestressed NSM CFRP
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    摘要:

    针对表层嵌贴预应力CFRP加固梁因黏结端部应力集中导致混凝土保护层易剥离 破坏的问题,提出了在CFRP端部设置梯度预应力的构造措施,并通过构件试验系统研究了梯 度锚固预应力CFRP加固梁的静载和疲劳性能. 试验结果表明:在静力荷载作用下,梯度锚固 预应力 CFRP 加固梁极限荷载较普通表层嵌贴预应力 CFRP 加固梁最大提高 35.06%,破坏模 式由端部保护层剥离破坏转变为保护层剥离与CFRP断裂复合破坏,梯度锚固预应力CFRP加 固显著提高了RC梁的静载性能,且有明显的黏结应力峰值传递现象;疲劳荷载下梯度锚固预 应力加固梁的疲劳寿命也较普通嵌贴加固梁显著提高,且疲劳破坏模式由端部保护层剥离转 变为纵向受拉钢筋疲劳断裂;梯度锚固预应力构造显著增强了加固梁抵抗剥离破坏发生的能 力,提高了加固梁疲劳性能.

    Abstract:

    The existing studies show that reinforced concrete beams strengthened with prestressed near-surface mounted (NSM) CFRP are easy to fail by concrete cover separation due to the stress concentration at the bonded end of CFRP. In this paper, the construction details of applying gradient prestress at the end of CFRP were proposed, and a series of experiments were carried out to study the load-carrying behavior of the strengthened beams under static and fatigue loads. The test results show that under static load, the ultimate load of beams strengthened with gradually anchored prestressed NSM CFRP was increased up to 35.06%, compared with the beam strengthened with prestressed NSM CFRP. And the failure mode was changed from the concrete cover separation at bonded end into the combined failure of the concrete cover and CFRP fracture. These indicate that the strengthen method with gradually anchored prestressed NSM CFRP can significantly improve the monotonic behavior of beams, and there is an obvious bond stress peak transfer phenomenon. In addition, the fatigue life of beams strengthened with gradually anchored prestressed NSM CFRP was significantly increased, and the fatigue failure mode is changed from the concrete cover separation to the fatigue fracture of longitudinal steel bars. The details of applying gradient prestress enhances the ability of strengthened beams to resist the failure of end concrete cover, and thus improves the fatigue performance.

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龚爽 ,彭晖 ,粟淼 ,张建仁 ,钟卿瑜 .梯度锚固预应力NSM CFRP加固 RC梁静力及疲劳性能研究[J].湖南大学学报:自然科学版,2022,49(1):113~123

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  • 在线发布日期: 2022-03-04
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