基于压电阻抗法的CFRP加固混凝土梁界面疲劳损伤监测  

Interface Fatigue Damage Monitoring of CFRP Reinforced Concrete Beam Based on PZT Impedance Method

作　　者：黎晓达 邓军[1,2] 李俊辉 李家坡 

机构地区：[1]广东工业大学土木与交通工程学院,广东 广州 [2]广州大学土木工程学院,广东 广州

出　　处：《土木工程》2021年第6期515-523,共9页Hans Journal of Civil Engineering

摘　　要：黏接层破坏是加固结构的主要破坏模式,有必要对CFRP-混凝土黏接界面进行损伤监测,而压电阻抗分析作为一种主动无损检测技术能有效对界面损伤进行识别。本文基于压电阻抗法对疲劳荷载作用下的CFRP加固混凝土梁的黏接界面损伤过程进行了定性和定量监测,并与应变片监测结果进行了对比。试验结果表明,通过压电阻抗曲线可以识别和定位加固梁疲劳过程中黏接界面损伤,表现为阻抗曲线的总体偏移和新波峰波谷的出现;根据阻抗RMSD值可以对加固梁的损伤状况进行定量分析,RMSD值能清晰直观地反映出粘结界面在疲劳荷载下的损伤累积过程并具有很高的灵敏度,进一步验证了压电阻抗技术实时监测CFRP-混凝土黏接界面损伤过程的有效性。The failure of CFRP-concrete bonding layer is the main failure mode of the reinforced structure. It is necessary to monitor the damage of the bonding interface, and piezoelectric impedance analysis as an active non-destructive testing technology can effectively identify the interface damage. Based on the piezoelectric impedance method, the damage process of the bonding interface of CFRP-reinforced concrete beams under fatigue loading was qualitatively and quantitatively monitored in this paper, and the results were compared with the monitoring results of strain gauges. The test results show that the piezoelectric impedance curve can be used to identify and locate the bonding interface damage in the fatigue process of the reinforced beam, which is manifested as the overall deviation of the impedance curve and the appearance of new peaks and valleys;the damage status of the reinforced beam can be quantitatively determined by RMSD value. RMSD values can clearly and visually reflect the damage accumulation process at CFRP-concrete interface under fatigue loading and are highly sensitive, which further verifies the effectiveness of piezoelectric impedance technology in real-time damage monitoring of the CFRP-concrete bonding interface.

关 键 词：压电阻抗法 界面损伤 钢筋混凝土梁 CFRP 疲劳 

分 类 号：TU3[建筑科学—结构工程]