基于外贴压电材料的钢管混凝土界面缺陷检测  

Experimental Study on Interface Debonding Detection of Concrete-Filled Steel Tubular Using Surface-mounted PZT

作　　者：蔡萍[1] 许斌[1] 周宇 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]中建一局集团建设发展有限公司华南分公司,广东广州511475

出　　处：《压电与声光》2015年第2期337-341,共5页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51009030);高等学校博士学科点专项科研基金资助项目(20120161110023)

摘　　要：钢管混凝土构件在超高层建筑和超大跨桥梁中的应用日益广泛,其钢管对核心混凝土的有效约束是发挥其力学性能优势的关键,钢管内壁与核心混凝土的界面剥离将削弱约束效应进而对构件的承载力和延性等力学性能带来负面影响。该文利用力锤激励钢管外壁,利用外贴于钢管外壁的压电陶瓷片作为传感器,通过对压电陶瓷监测波动信号在合适频段上的频响函数的分析,实现钢管混凝土构件界面剥离损伤监测。结果表明,提出的压电监测技术有效地识别了钢管混凝土构件的人工模拟和实际界面剥离缺陷,损伤指标对界面剥离缺陷敏感。The concrete-filled steel tubulars（CFSTs）have been widely employed in super high-rise building and long-span bridges.The confinement effect of steel tubular on concrete core of CFSTs plays key roles on its mechanical behavior and the debonding defect between the steel tubular and the confined concrete core can weaken the confinement and decrease the mechanical characteristics including load-carrying capacity and ductility.In this study,an interface debonding defect detection approach based on the analysis on the measurement of stress wave propagating across the interface using surface-mounted piezoelectric ceramic（PZT）patches on the surface of the steel tubular under impulse hammer excitation.The frequency response function（FRF）indices at different frequency bands of the measurement of each PZT patches are defined.Test results show that the proposed method is effective to identify the debonding defect and the defined indices are sensitive to the extent of artificially mimicked and actual interface debonding defects.

关 键 词：压电陶瓷(PZT) 界面剥离损伤 力锤激励 波动分析法 频响函数 表面粘帖 

分 类 号：TN384[电子电信—物理电子学]