FRP-混凝土界面黏结性能疲劳试验方案比选分析

Fatigue test program selection for FRP-to-concrete interfacial bonding properties

FRP因其优良性能,被广泛应用于混凝土结构的加固中,而FRP-混凝土界面黏结性能是FRP加固混凝土技术的关键问题。尤其对于桥梁结构,需承受反复荷载,所以FRP-混凝土界面黏结层抗疲劳性能是一个非常重要的研究课题。而试验方案的正确选取对于研究工作的成败起着决定性作用。就FRP-混凝土黏结性能疲劳试验方案的选择做深入分析。通过比较目前国内外研究FRP-混凝土界面性能的试验方法的优缺点,确定采用梁式试验方法。为确定梁式试件的结构及尺寸,采用有限元模拟及试验研究的方法对拟设计试件进行对比分析。最终得到能够较好观测FRP剥离的发展和研究FRP-混凝土界面黏结滑移关系的试验方案,为FRP-混凝土界面黏结层抗疲劳性能的研究奠定基础。

Fiber reinforced polymer(FRP) is widely used in the rehabilitation of concrete structures,because of its excellent performance.And FRP-to-concrete interfacial bonding property is the key problem of concrete rehabilitation technology with FRP.Especially for the bridge structures which need to withstand repeated loads,fatigue performance of FRP-to-concrete interface has become an extremely important research topic.The correct selection of the test program plays a decisive role in the results of research work.In this paper,thorough analysis has been done on the determination of fatigue test program for FRP-to-concrete bonding properties researches.By comparing the advantages and disadvantages of the present domestic and foreign test methods for FRP-to-concrete interfacial performance researches,beam test method was selected for the fatigue test researches.To determine the structure and dimension of the beam specimen,finite element simulation and test researches were used for comparison of the proposed alternative specimens.Finally,the appropriate test program,which could achieve better observation for the FRP debonding process and the better insight of local FRP-to-concrete bond-slip relationship,was proposed,and this laid the foundation for researches on fatigue performance of FRP-to-concrete interface.