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Proceedings Paper

Bragg grating structural sensing system for bridge monitoring
Author(s): Raymond M. Measures; A. Tino Alavie; Robert Maaskant; Myo Myint Ohn; Shawn E. Karr; Shang Yuan Huang
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Paper Abstract

Corrosion of steel within bridges and other large concrete structures has become a serious problem and consequently there is growing interest in replacing the steel within such structures with carbon fiber based composite materials. The first highway bridge in the world to use carbon fiber composite prestressing tendons was constructed and opened to the public in the fall of 1993. This two span bridge was also unique in another respect, it is the first highway bridge in the world to have been built with a set of fiber optic Bragg grating sensors structurally integrated into several of its precast concrete deck support girders. A four-channel fiber laser sensor demodulation system that was rugged, compact and transportable was developed for this project. This demodulation system monitored the changes in the internal strain on all three types (steel and two types of carbon fiber composite) of prestressing tendons over several months. The same structurally integrated fiber optic sensing system has also been used to measure the change in the internal strain within the deck girders arising from both static and dynamic loading of the bridge with a large truck.

Paper Details

Date Published: 21 September 1994
PDF: 7 pages
Proc. SPIE 2294, Distributed and Multiplexed Fiber Optic Sensors IV, (21 September 1994); doi: 10.1117/12.187400
Show Author Affiliations
Raymond M. Measures, Univ. of Toronto and Electrophotonics Corp. (Canada)
A. Tino Alavie, Univ. of Toronto and Electrophotonics Corp. (Canada)
Robert Maaskant, Univ. of Toronto and Electrophotonics Corp. (Canada)
Myo Myint Ohn, Univ. of Toronto and Electrophotonics Corp. (Canada)
Shawn E. Karr, Univ. of Toronto and Electrophotonics Corp. (Canada)
Shang Yuan Huang, Univ. of Toronto and Electrophotonics Corp. (Canada)


Published in SPIE Proceedings Vol. 2294:
Distributed and Multiplexed Fiber Optic Sensors IV
Alan D. Kersey; John P. Dakin, Editor(s)

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