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纤维增强聚合物(FRP)具有轻质、高强、抗腐蚀、耐疲劳和施工方便等突出优点,因此,采用FRP加固腐蚀混凝土结构具有广泛的应用前景。从试验方法、拉拔曲线、黏结强度等方面总结了国内外关于FRP加固对腐蚀钢筋-混凝土黏结性能影响的最新研究成果。已有研究表明:FRP横向约束可将钢筋拉拔试件由脆性的混凝土劈裂破坏转变为延性的钢筋拔出破坏;当腐蚀率较小时,FRP约束对保护层较厚试件的黏结强度影响较小,但FRP约束对减缓试件拉拔曲线中黏结应力下降速度,维持黏结应力较为有效,可提高抗震耗能。同时,本文分析了未来研究中需要关注的几个关键问题。
Fiber reinforced polymer (FRP) has the advantages of light weight, high strength, corrosion resistance, fatigue resistance and convenient construction. Therefore, the use of FRP to reinforce corroded concrete structures has a wide range of applications. The latest research results about the effect of FRP reinforcement on the corrosion bond between steel and concrete are summarized from the aspects of test method, drawing curve and bond strength. It has been shown that the lateral restraint of FRP can change the brittle concrete splitting failure to the ductile reinforcement pull-out failure. When the corrosion rate is small, the influence of FRP restraint on the bond strength of the thicker protective layer But the FRP constraint is more effective in reducing the rate of decrease of the bond stress in the drawing curve of the sample and maintaining the bond stress and can improve the seismic energy dissipation. At the same time, this article analyzes several key issues that need attention in future research.