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Proceedings Paper

Fiber optic strain monitoring of bridge column retrofitted with composite jacket under flexural loads
Author(s): Ken-An Lou; Gershon Yaniv; Dirk Hardtmann; Gloria Ma; Bernd D. Zimmermann
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Paper Abstract

This paper describes preliminary laboratory strain monitoring results of a 15-ft tall (2 ft in diameter) circular flexural lap-splice concrete column wrapped with a carbon-composite jacket. Optical fiber time domain (OFTD) strain sensors were embedded in the composite jacket in the hoop direction to monitor strains during testing. Optical fiber time domain methods are based on measuring the time-of-flight of optical signals launched into optical fibers which are embedded in or attached to flexible structures. This fiber-optic-based method allows in-line sensor multiplexing for distributed sensing along a single optical fiber strand. Time-domain multiplexing stands out as the most reliable and cost-effective approach to monitor strains within large civil structures over prolonged periods of time. In this study, the system utilizes novel fiber optic strain gauge patches. The strain values measured by the fiber optic strain gauge patches were compared to the values measured by conventional surface- mounted strain gauges. Excellent correlation between the fiber optic sensor data and the strain gauge data was obtained during the test.

Paper Details

Date Published: 20 April 1995
PDF: 9 pages
Proc. SPIE 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways, (20 April 1995); doi: 10.1117/12.207741
Show Author Affiliations
Ken-An Lou, Simula Government Products, Inc. (United States)
Gershon Yaniv, Simula Government Products, Inc. (United States)
Dirk Hardtmann, Simula Government Products, Inc. (United States)
Gloria Ma, XXsys Technologies, Inc. (United States)
Bernd D. Zimmermann, Alcoa Fujikura Ltd. (United States)

Published in SPIE Proceedings Vol. 2446:
Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways
Larryl K. Matthews, Editor(s)

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