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首页> 外文期刊>Mechanical systems and signal processing >Dominance of debonding defect of CFST on PZT sensor response considering the meso-scale structure of concrete with multi-scale simulation
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Dominance of debonding defect of CFST on PZT sensor response considering the meso-scale structure of concrete with multi-scale simulation

机译：考虑中尺度结构的CFST脱胶缺陷对PZT传感器响应的支配性

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摘要

Piezoelectric-lead-zirconate-titanate(PZT)-based interface debonding defects detection for concrete filled steel tubulars (CFSTs) has been proposed and validated through experiments, and numerical study on its mechanism has been carried out recently by assuming that concrete material is homogenous. However, concrete is composed of coarse and fine aggregates, mortar and interface transition zones (ITZs) and even initial defects and is a typical nonhomogeneous material and its mesoscale structure might affect the wave propagation in the concrete core of CFST members. Therefore, it is significantly important to further investigate the influence of mesoscale structure of concrete on the stress wave propagation and the response of embedded PZT sensor for the interface debonding detection. In this study, multi-physical numerical simulation on the wave propagation and embedded PZT sensor response of rectangular CFST members with numerical concrete core considering the randomness in circular aggregate distribution, and coupled with surface-mounted PZT actuator and embedded PZT sensor is carried out. The effect of randomness in the circular aggregates distribution and the existence of ITZs are discussed. Both a local stress wave propagation behavior including transmission, reflection, and diffraction at the interface between concrete core and steel tube under a pulse signal excitation and a global wave field in the cross-section of the rectangular CFST models without and with interface debonding defects under sweep frequency excitation are simulated. The sensitivity of an evaluation index based on wavelet packet analysis on the embedded PZT sensor response on the variation of mesoscale parameters of concrete core without and with different interface debonding defects under sweep frequency voltage signal is investigated in details. The results show that the effect of the interface debondings on the embedded PZT measurement is dominant when compared to the meso-scale structures of concrete core. This study verified the feasibility of the PZT based debonding detection for rectangular CFST members even the meso-scale structure of concrete core is considered.
机译：提出了基于压电-铅-锆-钛酸盐（PZT）的钢管混凝土界面脱胶缺陷检测方法，并通过实验验证了该方法的有效性，最近，通过假设混凝土材料均质，对其机理进行了数值研究。 。但是，混凝土是由粗骨料和细骨料，砂浆和界面过渡区（ITZ）甚至是初始缺陷组成的，是典型的非均质材料，其介观结构可能会影响CFST构件混凝土芯中的波传播。因此，进一步研究混凝土的中尺度结构对应力波传播的影响以及嵌入式PZT传感器对界面脱粘检测的响应具有重要意义。在这项研究中，考虑了圆形集料分布的随机性，并结合表面安装的PZT执行器和嵌入式PZT传感器，对具有数值混凝土芯的矩形CFST构件的波传播和嵌入式PZT传感器响应进行了多物理场数值模拟。讨论了随机性对圆形聚集体分布的影响以及ITZ的存在。矩形CFST模型截面中的局部应力波传播行为，包括在脉冲信号激励下混凝土芯-钢管界面处的透射，反射和衍射，以及在不存在界面结合缺陷的矩形CFST模型截面中的整体波场。模拟了扫频激励。详细研究了基于小波包分析的嵌入式PZT传感器响应对扫描频率电压信号下无界面脱胶缺陷和界面脱胶缺陷的中尺度参数变化的评价指标的敏感性。结果表明，与混凝土芯的中尺度结构相比，界面剥离对嵌入式PZT测量的影响是主要的。这项研究证明了即使考虑混凝土芯的中尺度结构，矩形CFST构件基于PZT的脱粘检测的可行性。

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