应用红外探测技术跟踪记录了 2个纤维增强聚合物复合材料(FRP)加固混凝土试件界面的疲劳损伤发展过程,结合系列疲劳试验分析了界面的疲劳力学性能和疲劳寿命.结果显示FRP-混凝土界面粘结区和剥离区有明显的温度差异,应用红外探测技术可以较准确地检测界面的损伤发展状况.界而的疲劳损伤从跨中位置萌生后向一端扩展,损伤演化可分为萌生、稳定发展和失稳发展3个阶段,稳定发展阶段约占界面疲劳总寿命的99%左右.在界面疲劳寿命的主要阶段内界面的疲劳损伤较小,发展缓慢,FRP应力也变化平稳.表明加崮的抗疲劳效果较好.最后给出了界面疲劳寿命的预测方法,界面的疲劳破坏制约了FRP材料强度性能的充分利用.
The interracial fatigue damage behaviors of two reinforced concrete (RC) beams strengthened with fiber reinforced plastic (FRP) were recorded with the infrared detecting method, and based on a series of fatigue tests the interracial fatigue properties and interracial fatigue lives were studied. It is found that the infrared detecting method can be used to monitor the interracial debonding effectively because the difference in infrared temperature between the bonding and debonding areas is obvious. The interracial debonding initiates at the concrete cracks around the mid-span and then expands to one end of the beam, in which the process for the initiation and stable or unstable growth of the interracial debonding has been observed with the stable phase about 99% of the total interracial fatigue life. In the main fatigue phase, the interracial damage is little and increases slowly; in addition FRP stress changes smoothly, showing that the interfacial fatigue properties are stable. The use of FRP high strength is restrained by the interracial fatigue failure, and at last according to test data a prediction approach for interracial lives is given.
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