Abstract
A method for structural health monitoring of cable-stayed bridges based on the dynamic distributed sensing of bridge deck strains is introduced in this article. The objective is to detect the location and the magnitude of the cables that have totally or partially lost their tensile load-carrying capacities. Dynamic sensing provides a realistic approach for condition assessment of the bridge under operational conditions. A Brillouin scattering optical time domain analysis (BOTDA) fiber-optic sensor was used to monitor the distributed strain in the deck of a scaled model cable-stayed bridge in the laboratory. The formulations developed in the present study take advantage of the dynamic distributed sensing capability of the BOTDA in amplitude transfer (AT) mode for the establishment of a relationship between the redistribution of deck strains and the tension loss in the individual cables of cable-stayed bridges. The experimental program involved single cable and multicable damage scenarios. The applicability of the method was independently evaluated by the direct measurement of cable forces and nonlinear finite-element analysis of the bridge.
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Acknowledgments
The financial support of the Turin Polytechnic University in the form of scholarships for the MSc students Alice Scarella and Giancarlo Salamone is highly appreciated.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 22 • Issue 3 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: May 19, 2016
Accepted: Sep 16, 2016
Published online: Nov 11, 2016
Published in print: Mar 1, 2017
Discussion open until: Apr 11, 2017
ASCE Technical Topics:
- Bridge decks
- Bridge engineering
- Bridge tests
- Bridges
- Bridges (by type)
- Cable stayed bridges
- Cables
- Continuum mechanics
- Decks
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Equipment and machinery
- Field tests
- Material mechanics
- Materials engineering
- Measurement (by type)
- Sensors and sensing
- Solid mechanics
- Strain
- Structural dynamics
- Structural engineering
- Structural health monitoring
- Structural systems
- Tests (by type)
Authors
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