Generalized Method and Monitoring Technique for Shear-Strain-Based Bridge Weigh-in-Motion
Publication: Journal of Bridge Engineering
Volume 21, Issue 1
Abstract
Development and testing of a new type of bridge weigh-in-motion system (BWIM) based on the measurement of shear forces near the supports of the bridges is described. The proposed system is applicable to both determinate as well as indeterminate bridges. Fiber-optic Bragg grating rosette sensors were used in this approach. Formulations are based on the establishment of shear influence lines in terms of axle weights and spacings. The system further involves calibration for the estimation of a bridge parameter , which is a function of the cross-sectional and material properties of the bridge. Three different bridges, one box-girder prestressed concrete bridge and two concrete-slab-on-steel-girder bridges with different span lengths, were instrumented for the evaluation of the proposed BWIM system. Field implementation involved a series of truck runs for calibration and evaluation of the BWIM system. Measured and actual truck-axle weights, spacings, and axle speeds as well as the gross vehicle weights yielded comparable results.
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Acknowledgments
This work was supported by the U.S. National Science Foundation under Grant No. 0730259 and by the Research Fund for the Doctoral Program of Higher Education of China, Grant No. 20120094110005.
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jun 3, 2014
Accepted: Jan 29, 2015
Published online: May 15, 2015
Discussion open until: Oct 15, 2015
Published in print: Jan 1, 2016
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