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首页> 外文期刊>Mechanical systems and signal processing >Active interface debonding detection of a concrete-filled steel tube with piezoelectric technologies using wavelet packet analysis
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Active interface debonding detection of a concrete-filled steel tube with piezoelectric technologies using wavelet packet analysis

机译：小波包分析的压电技术对钢管混凝土的主动界面脱粘检测

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摘要

Concrete-Filled Steel Tube (CFST) has been widely adopted in high-rise buildings and bridges as a typical structural member carrying vertical loads in recent years. The debonding between the steel tube and the concrete can dramatically reduce the confinement effect of steel tube on the concrete and decrease the load-carrying capacity and the ductility of the CFST. It is still challenging to develop reliable debonding monitoring and detection techniques for CFST because of the inaccessibility of the interface. In this study, an active interface condition monitoring approach for CFST by the use of lead zirconate titanate (PZT) piezoceramics based functional smart aggregates (SAs) embedded in concrete as actuator and PZT patches bonded on the surface of the steel tube as sensors is proposed and verified experimentally. Laboratory tests are performed on the CFST column, in which the deboning is mimicked by setting four thin styrofoam plates with different sizes on different locations of the four internal surfaces of the steel tube, respectively, before casting the concrete. The responses of the PZT sensors are measured when each SA is excited with sweep sinusoidal signals. According to the Fourier spectra and two evaluation indices based on the wavelet packet analysis on the PZT sensors measurements, the artificially mimicked debonding areas are detected successfully. Analysis on the sensitivity of the two evaluation indices shows that the indices based on wavelet packet analysis are more sensitive to the debonding defect. The proposed PZT based active debonding monitoring method provides an innovative approach to detect the debonding damage of CFST columns.
机译：近年来，混凝土填充钢管（CFST）已作为高层结构中承受垂直载荷的典型构件而被广泛采用。钢管与混凝土之间的剥离会显着降低钢管对混凝土的约束作用，并降低CFST的承载能力和延展性。由于接口的不可访问性，为CFST开发可靠的脱胶监控和检测技术仍然具有挑战性。在这项研究中，提出了一种主动界面状态监测方法，该方法通过使用锆钛酸铅（PZT）压电陶瓷基功能性智能骨料（SAs）嵌入混凝土中作为执行器，并结合在钢管表面上的PZT贴片作为传感器，提出了一种CFST的主动界面状态监测方法。并经过实验验证。在CFST柱上进行实验室测试，在该过程中，通过在浇铸混凝土之前分别在钢管的四个内表面的不同位置放置四个具有不同尺寸的薄泡沫塑料板来模拟去骨。当每个SA被扫描正弦信号激励时，将测量PZT传感器的响应。根据傅立叶光谱和基于PZT传感器测量的小波包分析的两个评估指标，成功地检测到了人工模拟的脱胶区域。对两个评价指标的敏感性分析表明，基于小波包分析的指标对脱胶缺陷更为敏感。所提出的基于PZT的主动脱胶监测方法提供了一种创新的方法来检测CFST柱的脱胶损伤。

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  • 来源
    《Mechanical systems and signal processing》 |2013年第1期|7-17|共11页
  • 作者

    Bin Xu; Ting Zhang; Gangbing Song; Haichang Gu;

  • 作者单位

    College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha, Hunan 410082, PR China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency (Hunan University), Yuelu Mountain, Changsha,Hunan 410082, PR China Department of Mechanical Engineering, University of Houston, University of Houston, Houston, TX 77204-4006, USA;

    College of Civil Engineering, Hunan University, Yuelu Mountain, Changsha, Hunan 410082, PR China;

    Department of Mechanical Engineering, University of Houston, University of Houston, Houston, TX 77204-4006, USA;

    Department of Mechanical Engineering, University of Houston, University of Houston, Houston, TX 77204-4006, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Concrete-filled steel tube (CFST); Health monitoring; Debonding detection; Wavelet packet analysis; Smart aggregates; Lead zirconate-titanate (PZT);

    机译：钢管混凝土（CFST）;健康监测;脱胶检测;小波包分析;智能聚合;钛酸锆铅（PZT）;

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