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FRP加固RC梁界面疲劳损伤红外检测分析
引用本文:邓江东,黄培彦,宗周红.FRP加固RC梁界面疲劳损伤红外检测分析[J].实验力学,2010,25(4):373-378.
作者姓名:邓江东  黄培彦  宗周红
作者单位:1. 福州大学,土木工程学院,福州,350108
2. 华南理工大学,土木与交通学院,广州,510640
3. 东南大学土木工程学院,南京,210096
基金项目:国家自然科学基金(10802023);福建省自然科学基金(2009J05122);福州大学科研基金(XRC-0841);工程结构福建省重点实验室基金(MEL200901)
摘    要:FRP-混凝土界面剥离损伤的探测是界面力学分析的一个难点。基于三个标准试件探讨了红外检测方法对FRP-混凝土界面剥离探测的精度、可行性以及剥离判断的标准,并对常幅疲劳荷载下FRP加固钢筋混凝土(RC)梁界面的疲劳行为进行了跟踪记录,分析了界面的疲劳破坏过程。试验结果表明,FRP加固RC梁界面存在初始的未粘结区,在疲劳加载的初期界面剥离快速增加,随后在大部分疲劳寿命期内保持稳定,在最后数千次加载循环内界面损伤失稳发展导致整个加固构件的破坏。文中基于红外数据给出了每个阶段的疲劳加载次数和界面剥离损伤的面积。

关 键 词:FRP    混凝土    加固    界面破坏    红外检测
修稿时间:3/9/2010 12:00:00 AM

Analysis of Interfacial Fatigue Behavior of RC Beams Strengthened with FRP Based on Infrared Thermography
DENG Jiang-dong,HUANG Pei-yan and ZONG Zhou-hong.Analysis of Interfacial Fatigue Behavior of RC Beams Strengthened with FRP Based on Infrared Thermography[J].Journal of Experimental Mechanics,2010,25(4):373-378.
Authors:DENG Jiang-dong  HUANG Pei-yan and ZONG Zhou-hong
Institution:College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;College of Civil Engineering, Southeast University, Nanjing, 210096, China
Abstract:The debonding detecting of FRP-concrete interface is a difficult problem in interface mechanics analysis. Infrared detection technology was used to record interfacial fatigue behaviors and analyze the interface fatigue damage processes. Based on three standard specimens, the probe accuracy, feasibility and interface debonding criterion of infrared detection measure were studied. Results show that initial debonding areas exist in the interface of RC beams strengthened with FRP. At an early stage during cyclic loading, the interfacial debonding expands rapidly then maintains stable in most fatigue life; the instability occurred during the last thousands cyclic loading results in a complete failure of strengthening RC beams. The fatigue loading number and the debonding area at every stages are presented in this paper based on infrared data.
Keywords:fiber reinforced polymer  concrete  strengthening  interfacial failure  infrared detecting
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