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Proceedings Paper

Bragg grating fiber optic sensing for bridges and other structures
Author(s): Raymond M. Measures; A. Tino Alavie; Robert Maaskant; Shang Yuan Huang; Michel LeBlanc
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Paper Abstract

We have demonstrated that fiber optic intracore Bragg grating sensors are able to measure the strain relief experienced over an extended period of time by both steel and carbon composite tendons within the concrete deck support girders of a recently constructed two span highway bridge. This is the first bridge in the world to test the prospects of using carbon fiber composite tendons to replace steel tendons. This unique set of measurements was accomplished with an array of 15 Bragg grating fiber optic sensors that were embedded within the precast concrete girders during their construction. We have also demonstrated that these same sensors can measure the change in the internal strain within the girders associated with both static and dynamic loading of the bridge with a truck. We are now studying the ability of Bragg grating fiber optic sensors to measure strong strain gradients and thereby provide a warning of debonding of any Bragg grating sensor from its host structure...one of the most important failure modes for any fiber optic strain sensor.

Paper Details

Date Published: 13 September 1994
PDF: 6 pages
Proc. SPIE 2361, Second European Conference on Smart Structures and Materials, (13 September 1994); doi: 10.1117/12.184816
Show Author Affiliations
Raymond M. Measures, Univ. of Toronto (Canada)
A. Tino Alavie, Univ. of Toronto (Canada)
Robert Maaskant, Univ. of Toronto (Canada)
Shang Yuan Huang, Univ. of Toronto (Canada)
Michel LeBlanc, Univ. of Toronto (Canada)


Published in SPIE Proceedings Vol. 2361:
Second European Conference on Smart Structures and Materials
Alaster McDonach; Peter T. Gardiner; Ron S. McEwen; Brian Culshaw, Editor(s)

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