Theoretical Solution for Fatigue Debonding Growth and Fatigue Life Prediction of FRP-Concrete Interfaces
Theoretical Solution for Fatigue Debonding Growth and Fatigue Life Prediction of FRP-Concrete Interfaces
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DOI：
10.1260/136943309790327707
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发表时间：
2009-12-01
影响因子：
2.6
通讯作者：
Iwashita, K.
中科院分区：
文献类型：
--
作者：
Diab, H. M.;Wu, Z.;Iwashita, K.
本文提出了一个解析解的演变和分布的剪切应力沿着整个粘结长度的FRP-混凝土界面由于模式II疲劳荷载。将蠕变-疲劳交互作用和剥离后疲劳裂纹扩展纳入非线性界面本构关系。虽然蠕变-疲劳相互作用由界面刚度的退化表示，但脱粘增长由巴黎方程和断裂能比G（max）/G（c）的形式控制。此外，采用了一种新的能量比形式，使之与脱键相关。通过一系列的双搭接剪切试验，结果表明，沿FRP-混凝土界面的脱粘增长率（da/dN）沿着减小，FRP-混凝土界面静粘结承载力的30%可以作为FRP加固梁的疲劳承载力极限。理论预测和实验结果之间的协议是有效的，具有良好的准确度。
This paper presents an analytical solution for the evolution and distribution of shear stresses along the entire bond length of FRP-concrete interfaces due to mode-II fatigue loading. The creep-fatigue interaction and fatigue crack growth after debonding initiation are incorporated into a nonlinear interfacial constitutive law. While the creep-fatigue interaction is represented by the degradation of the interfacial stiffness, the debond growth is governed by a form of the Paris equation and the fracture energy ratio, G(max)/G(c). Furthermore, a new form of energy ratio is adopted to be debond-dependent. Through a series of experimental double-lap shear specimens, the results showed that the debond growth rate (da/dN) along the FRP-concrete interfaces diminishes with fatigue cycles and that 30% of the static bond capacity of the FRP-concrete interface can be considered as the endurance limit of fatigue loading for FRP-strengthened beams. The agreement between the theoretical predictions and experimental results is valid, with a good degree of accuracy.