FATIGUE DURABILITY OF CONCRETE EXTERNALLY STRENGTHENED WITH FRP SHEETS
A primary concern of the FRP-strengthened structures is local debonding of FRP-concreteinterface, which affects negatively the structural integrity and long-term durability ofstrengthened members. This paper concerns the development of a nonlinear hybrid model forstudying the FRP-concrete interface behavior under fatigue loading. Based on the creep-fatigue interaction, the proposed model describes the behavior of the FRP-concrete interfacebefore debonding initiation. The fatigue debond process is governed by the softening modelthat depends on the strain fracture energy of the FRP-concrete interface and a damageaccumulation factor. A series of double lap shear specimens subjected to variable maximumfatigue loading has been carried out to calibrate and validate the proposed model. The resultsshow the ability of the proposed model not only to predict the fatigue life of double-lap shearspecimens, but also to provide useful insight into the failure mechanism of the FRP-concreteinterface due to fatigue loading. This model can also be used to understand the fatiguedeformation and FRP sheet strain distributions due to fatigue loading. This model allows forthe numerical study of the fatigue performance of structures that are externally strengthenedwith FRP sheets.
Fatigue FRP-concrete interface Numerical analysis
H.Diab Zhishen Wu
Department of Urban and Civil Engineering,Ibaraki University,Japan
国际会议
南京
英文
507-516
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）