Change Localization of a Steel-Stringer Bridge through Long-Gauge Strain Measurements
Publication: Journal of Bridge Engineering
Volume 21, Issue 3
Abstract
Development of the long-gauge fiber-optic sensor provides an excellent opportunity for structural-change localization, because it measures averaged strains over a long gauge length. A practical structural-change localization, procedure using long-gauge dynamic strains in the modal space is proposed to process the ambient vibration data of a steel-stringer bridge. The proposed procedure is easy to execute by general bridge engineers; meanwhile, it has a solid theoretical basis, thus guaranteeing its effectiveness. By theoretically deriving the magnitude ratios between the analytical strain frequency response functions (FRFs) and the estimated strain FRFs from ambient vibration data, it is proved that the proposed procedure is the same as using long-gauge strain mode shapes for change location; therefore, it is effective and much simpler for general bridge engineers to use. An ambient vibration test of a steel-stringer bridge using long-gauge fiber-optic sensors has been performed. The results of applying the proposed method to the measured and simulated data of the bridge have successfully verified its effectiveness for structural-change localization.
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Acknowledgments
This work was sponsored by the National Science Foundation of China (51108076).
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Nov 8, 2014
Accepted: Apr 17, 2015
Published online: Oct 2, 2015
Published in print: Mar 1, 2016
Discussion open until: Mar 2, 2016
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