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Optical Engineering

Assessment of an instrumented reinforced-concrete bridge with fiber-reinforced-polymer strengthening
Author(s): Steve E. Watkins; James W. Fonda; Antonio Nanni
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Paper Abstract

Field instrumentation is investigated on an in-service highway bridge over a 2-year period. Extrinsic Fabry-Pérot interferometric (EFPI) strain sensors provide a permanent health-monitoring capability. The bridge is a reinforced-concrete (RC) structure that was repaired and strengthened using fiber-reinforced-polymer (FRP) wraps. A sensor network monitors the load-induced strain in the FRP reinforcement and the steel rebar. Colocated electrical resistance strain gauges and a finite element analysis are used for comparison. Both dynamic and static load characteristics are analyzed for a near-capacity truck. The fiber optic measurements are generally consistent with the comparison measurements and the analytical results; and they show no failure or degradation as opposed to the electrical resistance gauges. We demonstrate the implementation and the performance of in situ EFPI sensors in a long-term field environment. Embedded fiber optic sensors can provide the required information for the intelligent management of a transportation infrastructure.

Paper Details

Date Published: 1 May 2007
PDF: 10 pages
Opt. Eng. 46(5) 051010 doi: 10.1117/1.2740758
Published in: Optical Engineering Volume 46, Issue 5
Show Author Affiliations
Steve E. Watkins, Univ. of Missouri/Rolla (United States)
James W. Fonda, Univ. of Missouri/Rolla (United States)
Antonio Nanni, Univ. of Missouri/Rolla (United States)

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