表层嵌贴CFRP-混凝土界面粘结性能简化分析  

Simplified Analysis on Bond Performance of Near-surface Mounted CFRP-concrete Interface

作　　者：郝海霞[1] 张建仁[1,2] 高勇[1] 彭晖[1,2] 蔡长丰[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004 [2]长沙理工大学桥梁工程安全控制省部共建教育部重点实验室,湖南长沙410004

出　　处：《中国公路学报》2015年第4期52-59,共8页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2015CB057701);湖南省教育厅科学研究重点项目(14A005);长沙理工大学土木工程重点学科基金项目(11ZDXK12)

摘　　要：为深入研究表层嵌贴碳纤维增强复合材料(CFRP)加固混凝土结构的界面粘结性能,采用试验与理论分析相结合的方法,分析了混凝土强度、粘结长度和槽边距等因素对界面粘结性能的影响,提出了考虑残余摩擦力的三折线粘结滑移本构模型,并将其简化为无上升段的双折线模型,建立了其界面粘结应力微分方程,通过求解方程得出了解析解的一般形式,推导出界面粘结应力、界面滑移量的分布函数,进而得到了界面粘结承载力的计算公式。最后通过试验对双折线粘结滑移模型进行了验证,并与三折线粘结滑移模型进行了对比分析。研究结果表明:由简化的双折线粘结滑移模型得到的界面粘结行为曲线和基于三折线模型的差异不大,并与试验结果吻合较好;提出的简化分析方法能够较好地描述表层嵌贴CFRP与混凝土的粘结行为。To deeply explore the bond performance reinforcement concrete interface, experimental and of near-surface mounted （NSM） CFRP and theoretical methods were used to analyze the influences of concrete strength, bond length, and distance between groove and specimen edge on the bond performance of NSM CFRP-concrete interface. The tri-linear bond-slip constitutive model considering the residual friction was proposed, which was simplified to bilinear model without rising line. The differential equation of bond stress on NSM CFRP-concrete was established. Through solving the equation, analytic solution was obtained, bond stress function and slip distribution function were derived, and bond capacity calculation formula was obtained. Finally, the bilinear bond-slip model was verified by testing results and compared with the tri- linear bond-slip constitutive model. The results show that the bond curve of interface obtained from the simplified bilinear model has little difference with that from the tri-linear model, which is in good agreement with test results. The simplified analysis method of bond stress on NSM CFRP-concrete interface can well describe the bond performance of near-surface mounted CFRP- concrete interface.

关 键 词：桥梁工程 表层嵌贴CFRP-混凝土界面 试验与理论分析 粘结滑移本构关系 粘结性能 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]