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Real-time localization of micro-damage in concrete beams using DIC technology and wavelet packet analysis
Cement & Concrete Composites ( IF 10.5 ) Pub Date : 2021-07-25 , DOI: 10.1016/j.cemconcomp.2021.104198
Kaiyang Zhou 1 , Dong Lei 1 , Jintao He 1 , Pei Zhang 2 , Pengxiang Bai 1 , Feipeng Zhu 1
Affiliation  

As the service time of large civil engineering structures increases, structural health monitoring providing early warning information becomes increasingly important. In this study, three reinforced concrete beams were poured as specimens, and four-point bending experiments were conducted to investigate the localization of the micro-damage of the specimens. Three-dimensional digital image correlation (DIC) technique was employed to acquire and handle the images of changes in the surface of the specimens under various loads during the experiment. Then, Daubechies wavelet with 3 layers and order N of 10 was utilized to extract the energy spectrum of the principal strain nephogram obtained by DIC. The energy change rate (ECR) and energy change rate standard deviation (ECRSD) were defined and selected as micro-damage identification indicators. Then the ECR and ECRSD were calculated in full-filed and partial-field respectively with the energy spectrum acquired by Daubechies wavelet. Finally, a calculation process with detailed steps was proposed to realize the real-time location and observe the development of micro-damage on the surface of specimens. The accordance of calculation results and experimental results illustrates that the coupled strategy between DIC and Daubechies wavelet method is powerful in the real-time location of micro-damage on the concrete structure. The findings of this study could provide an effective and feasible method for structural health monitoring.



中文翻译:

基于DIC技术和小波包分析的混凝土梁微损伤实时定位

随着大型土木工程结构服务时间的增加,提供预警信息的结构健康监测变得越来越重要。本研究以三根钢筋混凝土梁作为试件浇筑,并通过四点弯曲试验研究试件微观损伤的定位。采用三维数字图像相关(DIC)技术获取和处理实验过程中不同载荷作用下试样表面变化的图像。然后,利用 3 层、N 阶为 10 的 Daubechies 小波提取 DIC 获得的主应变云图的能谱。定义能量变化率(ECR)和能量变化率标准差(ECRSD)作为微损伤识别指标。然后利用Daubechies小波获得的能谱分别计算全场和分场的ECR和ECRSD。最后,提出了一种详细步骤的计算过程,以实现实时定位并观察试样表面微损伤的发展。计算结果与实验结果的一致性表明,DIC与Daubechies小波方法的耦合策略在混凝土结构微损伤的实时定位方面具有强大的作用。本研究结果可为结构健康监测提供一种有效可行的方法。提出了一种详细步骤的计算过程,以实现实时定位并观察试样表面微损伤的发展。计算结果与实验结果的一致性表明,DIC与Daubechies小波方法的耦合策略在混凝土结构微损伤的实时定位方面具有强大的作用。本研究结果可为结构健康监测提供一种有效可行的方法。提出了一种详细步骤的计算过程,以实现实时定位并观察试样表面微损伤的发展。计算结果与实验结果的一致性表明,DIC与Daubechies小波方法的耦合策略在混凝土结构微损伤的实时定位方面具有强大的作用。本研究结果可为结构健康监测提供一种有效可行的方法。

更新日期:2021-07-27
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