Monitoring of the load-induced RC beam structural tension/compression stress and damage using piezoelectric transducers
Monitoring of the load-induced RC beam structural tension/compression stress and damage using piezoelectric transducers
复制标题
使用压电传感器监测负载引起的 RC 梁结构拉/压应力和损坏
DOI：
10.1016/j.engstruct.2017.10.046
复制
发表时间：
2018-01-01
影响因子：
5.5
通讯作者：
Zhu, Hongping
中科院分区：
文献类型：
--
作者：
Ai, Demi;Luo, Hui;Zhu, Hongping
在结构健康监测（SHM）领域中，有效地监测工程结构或构件的机械应力是了解结构损伤发生的关键。本文研究了安装在结构特定位置的智能压电锆钛酸铅（PZT）传感器对载荷引起的结构拉压应力和损伤的监测。从理论上将结构拉/压应力引入机械阻抗中，建立了一种新颖的PZT-结构一维动力相互作用模型。概念验证实验进行了使用钢筋混凝土（RC）梁进行四点弯曲试验，直到失败，其中拉应力和压应力同时产生在底部/顶部边缘的梁和捕获的两个安装的PZT传感器。通过分析压电陶瓷换能器的机电导纳（EMA）特征，并与无应力状态下的EMA特征进行比较，定性评价了加载引起的结构拉压应力和应力损伤。利用统计均方根偏差指数对应力和损伤进行定量评估。试验结果表明，在拉压应力作用下EMA信号的峰值变化和频移具有匡威的性质，其渐变规律为预测应力和损伤的发展提供了有力的依据。本文的结果可以潜在地帮助监测结构应力和区分在现实生活中的SHM应用的损伤。
Efficacious monitoring the mechanical stress of engineering structures or components holds the key to understanding the occurrence of structural damage in Structural Health Monitoring (SHM) domains. This paper investigated the monitoring of the load-induced structural tension/compression stress and damage using smart Piezoelectric lead Zirconate Titanate (PZT) transducers mounted to specific locus on structures. Structural tension/compression stress was theoretically incorporated into mechanical impedance to formulate a novel one-dimensional PZT-structure dynamic interaction model. Proof-of-concept experimentation was conducted using a reinforced concrete (RC) beam subjected to a four-point bending test till failure, in which tension and compression stress were simultaneously produced at the bottom/top edge of the beam and captured by two mounted PZT transducers. Load-induced structural tension/compression stress and stress-induced damage were qualitatively evaluated through analyzing the characters of electromechanical admittance (EMA) signatures and comparing to that of the non-stressed PZT transducer. Quantification assessment of stress and damage using statistical root mean square deviation index were also presented. Test results indicated that the peak variation and frequency shift of EMA signatures responding to tension and compression stress were converse in nature, and their gradual changes provided cogent evidences for predicting the development of stress and damage. Results of this paper can be potentially to help monitor structural stress and discriminate from damages in real-life SHM applications.