基于压电传感技术的木结构连接节点损伤识别  

Damage Detection for Timber Structure Joints Based on Piezoelectric Sensing Technology

作　　者：张全景 韩芳[1,2] 陈天驰 ZHANG Quan-jing;HAN Fang;CHEN Tian-chi(College of Science,Wuhan University of Science and Technology,Wuhan 430081,Hubei;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan 430081,Hubei,China)

机构地区：[1]武汉科技大学理学院,湖北武汉430081 [2]冶金工业过程系统科学湖北省重点实验室,湖北武汉430081

出　　处：《木材科学与技术》2022年第1期63-67,共5页Chinese Journal of Wood Science and Technology

基　　金：冶金工业过程系统科学湖北省重点实验室开放基金“基于压电阻抗技术的木梁损伤识别技术研究”(Y201904)。

摘　　要：针对木结构中常见的榫卯连接与螺栓连接节点,利用压电传感技术对其进行健康工况和损伤工况的数值模拟研究,其中榫卯连接考虑榫头的平动、转动、缺损工况,螺栓连接考虑预紧力松动工况;对压电片所接收到的信号进行以小波包分解,并以各频段信号能量的总和作为能量指标,对不同损伤工况进行定量评估,最后以螺栓连接为例进行实验验证。数值计算和实验结果均表明,压电片所接收到的信号能量随损伤程度的不断增加而减小,利用压电传感技术可以有效识别不同类型连接节点处不同程度的损伤,该结论可为工程实际提供参考。The digital simulations for intact and failure conditions of common timber structure joints of tenon-mortise joints and bolted joints were conducted based on the piezoelectric sensing technology.Specifically,the horizontal movement,rotation,and defects of tenons were considered as the failure load cases for tenon-mortise joints,while the relaxation of pre-tightening force was considered as the failure load case for the bolted joints.Then the failure index,which is the sum of signal energy for different frequency bands decomposed based on wavelet packet analysis,was used to quantitatively evaluate the degree of damage severity.Finally,the experiment of bolted joints was implemented to verify the digitalsimulation results.Both of the digital and the experiment results indicate that the signal energy received by piezoelectric plates gradually decreases with the increase of damage severity.The piezoelectric sensing technology can efficiently detect the local damage at the timber joints,which provide a reference for the engineering practice.

关 键 词：压电传感技术 木结构连接节点 损伤识别 小波包能量 

分 类 号：TN384[电子电信—物理电子学] TU531.15[建筑科学—建筑技术科学]