Analysis of Interfacial Fatigue Behavior of RC Beams Strengthened with FRP Based on Infrared Thermography
FRP加固RC梁界面疲劳损伤红外检测分析

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.