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Numerical study on the mechanism of active interfacial debonding detection for rectangular CFSTs based on wavelet packet analysis with piezoceramics

机译：基于压电陶瓷小波包分析的矩形CFST主动界面脱胶机理的数值研究

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摘要

In recent years, Piezoelectric Lead Zirconate Titanate (PZT) based active interfacial debonding defect detection approach for concrete-filled steel tubular (CFST) columns has been proposed and validated experimentally. In order to investigate the mechanism of the PZT based interfacial debonding detection approach, a multi-physics coupling finite element model (FEM) composed of surface-mounted PZT actuator, embedded PZT sensor and a rectangular CFST column is constructed to numerically simulate the stress wave propagation induced by the surface-mounted PZT actuator under different excitation signals with different frequency and amplitude. The measurements of the embedded PZT sensor in concrete core of the CFST columns with different interfacial debonding defect lengths and depths are determined numerically with transient dynamic analysis. The linearity between the PZT response and the input amplitude, the effect of different frequency and measurement distance are discussed and the stress wave fields of CFST members without and with interface debonding defects are compared. Then, the response of the embedded PZT in concrete core is analyzed with wavelet packet analysis. The root mean square deviation (RMSD) of wavelet packet energy spectrum of the PZT measurement is employed as an evaluation index for the interfacial debonding detection. The results showed that the denned index under continuous sinusoidal and sweep frequency signals changes with the interfacial defects length and depth and is capable of effectively identifying the interfacial debonding defect between the concrete core and the steel tubular. Moreover, the index under sweep frequency signal is more sensitive to the interfacial debonding. The simulation results indicate that the interfacial debonding defect leads to the changes in the propagation path, travel time and the magnitude of stress waves. The simulation results meet the findings from the previous experimental study by the authors and help understand the mechanism of interfacial debonding defect detection for CFSTs using PZT technology.
机译：近年来，提出了基于压电锆钛酸铅（PZT）的钢管混凝土（CFST）柱主动界面脱胶缺陷检测方法并进行了实验验证。为了研究基于PZT的界面脱粘检测方法的机理，构建了由表面安装的PZT执行器，嵌入式PZT传感器和矩形CFST柱组成的多物理场耦合有限元模型（FEM），以数值模拟应力波。表面安装的PZT执行器在不同频率和振幅的不同激励信号下引起的传播。通过瞬态动力分析，数值确定了CFST柱混凝土芯中具有不同界面剥离缺陷长度和深度的嵌入式PZT传感器的测量结果。讨论了PZT响应与输入幅度之间的线性关系，不同频率和测量距离的影响，并比较了无界面缺陷和界面缺陷的CFST构件的应力波场。然后，利用小波包分析法分析了混凝土核心中嵌入式PZT的响应。 PZT测量的小波包能量谱的均方根偏差（RMSD）被用作界面剥离检测的评估指标。结果表明，在连续正弦波和扫频信号的作用下，折射率随界面缺陷长度和深度的变化而变化，能够有效地识别混凝土芯与钢管之间的界面脱胶缺陷。此外，扫描频率信号下的折射率对界面剥离更敏感。仿真结果表明，界面脱粘缺陷会导致传播路径，传播时间和应力波幅值的变化。仿真结果符合作者先前实验研究的结果，并有助于了解使用PZT技术检测CFST的界面剥离缺陷的机理。

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