Huynh, T.-C.; Dang, N.-L.; Kim, J.-T. Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface. Sensors2018, 18, 2766.
Huynh, T.-C.; Dang, N.-L.; Kim, J.-T. Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface. Sensors 2018, 18, 2766.
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 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 mechanistic understanding of 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 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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