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http://dx.doi.org/10.5762/KAIS.2020.21.11.317

A Study on the Characteristics of Natural Frequency and Impedance of Elastically Restrained Cracked Beam with a Tip Mass  

Lee, Jong-Won (Department of Architectural Engineering, Namseoul University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.11, 2020 , pp. 317-325 More about this Journal
Abstract
The development of a technique that can monitor the cracks, which is one of the typical types of damage, is necessary to secure the structural safety of elastically restrained cantilever-type beams with a tip mass that is used widely in infrastructure. Impedance techniques have been actively researched to detect cracks, and the cracks were estimated mainly by experimentally investigating the relationship between the crack and impedance signal. This study examined the correlation between the change in the impedance signals due to the crack, and the natural frequency obtained analytically. After updating the analysis model for the intact beam, the impedance signal was measured while gradually inflicting cracks in the cantilever-type beam, and the damage index was obtained. The results were compared with the natural frequencies calculated from the updated analysis model to investigate the correlation. A close correlation was observed between the experimentally obtained impedance damage index, and the analytically calculated natural frequency. Using this correlation, the structural characteristics could be evaluated more accurately from the damage estimation results, and the behavior of the structure could be predicted effectively using the analysis model.
Keywords
Natural Frequency; Impedance; Crack; Elastically Restrained; Tip Mass;
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Times Cited By KSCI : 3  (Citation Analysis)
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