Detection of Debonding Defect of Irregular SRC Column Interface Based on PZT Impedance Measurement
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摘要: 目前大型不规则多腔钢骨混凝土结构在超高层建筑上的应用日益广泛, 混凝土与钢骨壁间的界面结合状况影响二者的共同工作性能。针对不规则多腔钢骨混凝土柱构件, 模拟了混凝土与钢骨内壁之间的界面剥离缺陷, 在钢骨内壁表面粘贴压电陶瓷片, 采用阻抗仪测量了压电材料与结构构成的机电耦合系统的阻抗值。基于存在界面剥离及健康状态处的压电陶瓷片的阻抗测量结果, 将二者的方均根偏差(ERMSD)作为损伤指标。结果表明, 存在界面剥离以及健康状态处测量所得的压电阻抗曲线有明显变化, 基于压电阻抗测量的损伤指标可实现不规则多腔钢骨混凝土柱内部隐蔽的界面剥离缺陷的有效检测。Abstract: Large irregular multi-chambers steel reinforced concrete (SRC) structures have been widely employed in super high-rise buildings, and the bonding condition between concrete and steel plate is critical. In this paper, the interfacial debonding defect between concrete and steel plate in a complex multi-chamber SRC column is mimicked artificially. With PZT patches surface-bonded on steel plate, the impedance of electromechanical coupled system composed by piezoelectric material and structure is measured. The measurement results of PZT patches in both debonding areas and healthy areas of the interface are compared, and the root mean square deviation (ERMSD) is defined as a damage index to describe the bonding condition of the interface. Results show the figures of PZT impedance in interface debonding areas are quite different from those in healthy areas and PZT impedance measurement based damage index can effectively detect the inaccessible interface debonding defects.
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Keywords:
- Health monitoring /
- SRC column /
- PZT impedance /
- Debonding defect /
- RMSD
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