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Impedance based damage assessment of concrete under the combined effect of impact and temperature using different piezo configurations
Sensors and Actuators A: Physical ( IF 4.6 ) Pub Date : 2022-07-21 , DOI: 10.1016/j.sna.2022.113763
Indrajeet Singh , Nirendra Dev , Shilpa Pal

The concrete structures undergo severe damage under the impact loading, which may cause further fatal casualties to life and property and these damage become more dangerous as the temperature rises. This is controlled by performing the proper structural health monitoring (SHM) of structures. In recent years, the electromechanical impedance technique (EMI) has emerged as a promising method for monitoring the health of concrete structures. The objective of this study is to determine the damage in concrete under the impact and thermal loading circumstances using the EMI technique. For this purpose, an experimental study was conducted to investigate the effect of impact loading on concrete at varying temperatures using different piezo sensor configurations. The concrete cube was tested for three piezo sensor configurations, bonded, non-bonded and embedded with a lead zirconium titanate (PZT) patch. A free-falling iron ball was dropped from a fixed height above the top surface of the test samples to simulate the impact loading. Temperature heating was performed using the oven for each concrete cube at 50 °C, 100 °C and 150 °C. The impedance measurement device was used to acquire the signatures from the piezo sensors. Statistical parameters such as root mean square deviation and mean absolute percentage deviation were calculated from the signature, demonstrating a high degree of damage detection under the impact loading at higher temperatures. These signatures are also used to determine the PZT equivalent system parameters (damping, stiffness, and mass) of the specimens under various damage conditions, as well as to establish the remaining life of the model. The study revealed that the EMI technique in SHM is capable of accurately assessing damage under impact loading at rising temperatures. Although all three sensor configurations are capable of detecting damage but, the study shows that the embedded sensors provide more accurate results.



中文翻译:

基于阻抗的混凝土损伤评估在冲击和温度的综合作用下使用不同的压电配置

混凝土结构在冲击荷载作用下遭受严重破坏,可能造成更多的生命财产伤亡,而且随着温度的升高,这些破坏变得更加危险。这是通过对结构进行适当的结构健康监测 (SHM) 来控制的。近年来,机电阻抗技术 (EMI) 已成为监测混凝土结构健康状况的一种很有前景的方法。本研究的目的是使用 EMI 技术确定在冲击和热载荷情况下混凝土的损坏情况。为此,进行了一项实验研究,以使用不同的压电传感器配置来研究在不同温度下冲击载荷对混凝土的影响。混凝土立方体针对三种压电传感器配置进行了测试,粘合,非粘合并嵌入锆钛酸铅 (PZT) 贴片。一个自由落体的铁球从测试样品顶面上方的固定高度落下,以模拟冲击载荷。使用烘箱在 50°C、100°C 和 150°C 下对每个混凝土立方体进行温度加热。阻抗测量装置用于从压电传感器获取特征。从签名中计算出诸如均方根偏差和平均绝对百分比偏差等统计参数,表明在较高温度下的冲击载荷下具有高度的损伤检测能力。这些特征还用于确定各种损坏条件下试样的 PZT 等效系统参数(阻尼、刚度和质量),以及确定模型的剩余寿命。研究表明,SHM 中的 EMI 技术能够准确评估温度升高时冲击载荷下的损坏。尽管所有三种传感器配置都能够检测到损坏,但研究表明嵌入式传感器提供了更准确的结果。

更新日期:2022-07-21
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