Fiber optic strain monitoring of bridge column retrofitted with composite jacket under flexural loads

Ken-An Lou; Gershon Yaniv; Dirk Hardtmann; Gloria Ma; Bernd D. Zimmermann

doi:10.1117/12.207741

20 April 1995 Fiber optic strain monitoring of bridge column retrofitted with composite jacket under flexural loads

Ken-An Lou, Gershon Yaniv, Dirk Hardtmann, Gloria Ma, Bernd D. Zimmermann

Proceedings Volume 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways; (1995) https://doi.org/10.1117/12.207741
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

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.

Citation Download Citation

Ken-An Lou, Gershon Yaniv, Dirk Hardtmann, Gloria Ma, and Bernd D. Zimmermann "Fiber optic strain monitoring of bridge column retrofitted with composite jacket under flexural loads", Proc. SPIE 2446, Smart Structures and Materials 1995: Smart Systems for Bridges, Structures, and Highways, (20 April 1995); https://doi.org/10.1117/12.207741

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