期刊
SENSORS
卷 18, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/s18092766
关键词
preload monitoring; bolted connection; bolt-loosening; piezoelectric sensor; impedance response; smart interface
资金
- Technology Advancement Research Program (TARP) - Ministry of Land, Infrastructure, and Transport of the Korean government [18CTAP-C142999-01]
- Brain Korea 21 Plus program of the Korean government
- Korea Agency for Infrastructure Technology Advancement (KAIA) [142999] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [22A20130000122] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a preload monitoring method using impedance signatures obtained from a piezoelectric-based smart interface is presented for bolted girder connections. Firstly, the background theory of the piezoelectric-based smart interface and its implementation into the health monitoring of bolted connections are outlined. A simplified electro-mechanical (EM) impedance model of a smart interface-embedded bolted connection system is formulated to interpret a mechanistic understanding of the EM impedance signatures under the effect of bolt preload. Secondly, finite element modeling of a bolted connection is carried out to show the numerical feasibility of the presented method, and to predetermine the sensitive frequency band of the impedance signatures. Finally, impedance measurements are conducted on a lab-scaled bolted girder connection, to verify the predetermined sensitive frequency range and to assess the bolt preload changes in the test structure.
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