Detection of Tension Loss in Cables of Cable-Stayed Bridges by Distributed Monitoring of Bridge Deck Strains
Publication: Journal of Structural Engineering
Volume 142, Issue 6
Abstract
Development of a simplified approach for monitoring the cables of cable-stayed bridges is described in this article. The method introduced in this paper uses the distributed measurement of strains along the bridge deck to detect the cables that have totally or partially lost their tensile force. The fundamental principle employed in formulating the method is the interrelationship between the individual cable forces and the bending moment along the bridge span. The proposed method was evaluated through an experimental program that involved fabrication and testing of a reduced scale model of a single plane cable-stayed bridge. Distributed strain along the span length was monitored by a Brillouin Optical (Neubrex, Hyogo, Japan) Time Domain Analysis fiber optic sensor system. Strain gauges, Fiber Bragg Grating sensors (Technica Optical Component, LLC, Beijing, China), and a finite element model of the bridge were employed for evaluating the efficiency of the proposed method. Several different damage cases were considered in the experiments, including single and multiple cable tension loss scenarios. Experimental results revealed that it was possible to detect the cables that had experienced tension losses of 30% or more.
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Acknowledgments
This work was supported by the National Science Foundation PIRE program under Grant Number 0730259.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 20, 2015
Accepted: Oct 28, 2015
Published online: Jan 21, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 21, 2016
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