FRP加固对腐蚀钢筋与混凝土黏结性能的影响  

Bond Behavior of Corroded Reinforcement in Concrete Strengthened with FRP

作　　者：邓宗才[1] 万操[1] 李建辉[1] 

机构地区：[1]北京工业大学城市与工程防灾减灾省部共建教育部重点实验室,北京市100214

出　　处：《公路》2010年第12期145-151,共7页Highway

基　　金：国家自然科学基金项目;项目编号50978006;北京市自然科学基金项目;项目编号8082002

摘　　要：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） composites has broad application prospects in the rehabilitation and retrofit of existing corroded concrete structures due to its unique properties,such as lightweight,high tensile strength,good resistance to corrosion and fatigue and convenient to construction.The state-of-the-art review on the newest domestic and foreign results of bond behavior between corroded steel reinforcement and concrete strengthened with FRP from the respects of experimental method,pullout curve,bond strength and so on are presented.It is found from the test results that FRP constraint can make the failure mode change from brittle concrete splitting to ductile pulling out of steel bars.At a small level of corrosion,the FRP constraint has less impact on bond strength when the concrete cover is thick,but it is effective on slowing the bond stress＇s rate of decline and maintaining the bond strength.And the FRP constraint can improve the wasted energy in earthquake resistance.Finally,several key issues in the future are discussed.

关 键 词：混凝土 加固 FRP 黏结性能 腐蚀 

分 类 号：TU398.9[建筑科学—结构工程]