侧向约束下FRP加固混凝土界面黏结性能  

Effects of lateral constraint on the behaviour of FRP-to-concrete bond

作　　者：高磊[1] 张峰[1] 叶见曙[2] 刘佳琪 Gao Lei;Zhang Feng;Ye Jianshu;Liu Jiaqi(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;School of Transportation,Southeast University,Nanjing 210096,China)

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2018年第6期996-1003,共8页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金青年基金资助项目(51108249);山东省自然科学基金面上资助项目(ZR2016EEM21)

摘　　要：为了揭示侧向约束对FRP-混凝土界面黏结性能的影响,基于三折线黏结-滑移模型开展了侧向约束下FRP黏结混凝土界面剥离全过程分析,推导了FRP-混凝土界面黏结荷载表达式,进行了模型试验、三维数值模拟验证和参数分析.研究结果表明:无限粘贴长度情况下,有侧向约束的FRP-混凝土黏结界面经历了弹性、弹性-软化、弹性-软化-摩擦、软化-摩擦和摩擦5个阶段,界面荷载-滑移关系和黏结应力分布的试验和数值计算结果与理论模型具有较好的一致性.当侧向约束力增加,界面荷载强度和滑移量均会显著提高,因此侧向约束能有效抑制外贴FRP加固的剥离.侧向约束下增加黏结长度或提高FRP刚度均能进一步提高荷载强度,但FRP刚度提高会导致界面延性减小.To reveal the effect of lateral constraint on the FRP(fibre-reinforced polymer)-to-concrete bond behaviour,the whole process analysis of FRP bonded concrete interface debonding under lateral constraint was carried out based on the trilinear bond-slip model.The expression of FRP-concrete interface load was derived.Model testing,3D numerical model validation and parametric analysis were performed.The research results show that in the case of infinitely pasted length,the FRP-concrete bonded interface with lateral constraint experiences five stages of elasticity,elasticity-softening,elasticity-softening-friction,softening-friction and friction.The experimental and numerical results of the interface load-slip relationship and the bond distribution are in good agreement with the theoretical model.When the lateral constraint force is increased,the interface load strength and the slip value are both significantly improved,so the lateral constraint can effectively suppress the debonding of the externally attached FRP reinforcement.Increasing the bond length or increasing the FRP stiffness under lateral constraint can further increase the load strength,but increasing the FRP stiffness will lead to a decrease in interface ductility.

关 键 词：FRP加固混凝土 侧向约束 三折线模型 试验 数值模拟 

分 类 号：TU312[建筑科学—结构工程]