土木工程与管理学报2016，Vol.33Issue(6)：39-42,56,5.
基于压电阻抗的隧道管片结构螺栓松动损伤识别试验
EMI Based Experiment on Tunnel Segment Structural Bolt-looseness Damage Detection
摘要
Abstract
Electromechanical impedance (EMI)based damage detection technique applied for large structural health monitoring has not been widely studied. This paper investigated the effectiveness of EMI technique and the sensitive distance of piezoelectric (PZT ) sensor for large tunnel segment structural bolt looseness detection. Through measuring the electromechanical admittance spectrum of the PZT sensors installed on different locations,characterizations of the impedance curves were analyzed. Then resonant frequency variation tendency of the admittance spectrum was studied after the bolt looseness damage inducing to the segment structure,and statistical index RMSD was also calculated for damage quantification. Its’rate of change was also adopted for evaluation on sensor sensitivity. The experimental results indicated that the PZT sensor can capture the development of the bolt looseness damage,thus the EMI technique is feasible for the large tunnel segment structural damage detection. And it was more effective of PZT sensor located on the bolt than on the concrete. With the development of structural damage,the index values of the near PZT senor varied more largely than the distant ones,the relationship between sensor sensitivity and distance was inverse linear proportion.关键词
隧道管片/压电阻抗(EMI)/螺栓松动/损伤识别Key words
tunnel segment/electromechanical impedance (EMI)/bolt looseness/damage detection分类
建筑与水利引用本文复制引用
艾德米,罗辉,朱宏平,王超..基于压电阻抗的隧道管片结构螺栓松动损伤识别试验[J].土木工程与管理学报,2016,33(6):39-42,56,5.基金项目
国家自然科学基金（51578260；51578261；51408250）；贵州省交通厅科技项目 （）
