Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Embedded fiber optic sensing for bridge rehabilitation
Instrumentation of a reinforced-concrete bridge subject to structural rehabilitation is described. This forty-seven-year-old bridge is located in Dallas County, Missouri and was upgraded using fiber-reinforced-polymer (FRP) sheets and rods. The permanent field instrumentation consists of an array of extrinsic Fabry-Perot interferometric fiber-optic strain sensors and co-located electrical resistance strain gauges. The sensors monitor flexural strain in the concrete, the original steel rebar, and the FRP reinforcement for the deck and beam in the central span of the bridge. The sensor system is designed for long-term health monitoring of the FRP-reinforcement with emphasis on field security and data acquisition. Implementation protocols for site preparation, installation, inspection, and use of fiber-optic sensors are discussed. The optical measurements will be compared to other measurements during the preliminary load testing. The motivation for this work is to demonstrate the implementation and use of fiber-optic-based sensing in field applications. A description of the structure, the installation of a sensor array, and the preliminary test measurements for load-induced strain have been shown. A comparison of FOSS and ESG sensors is given to verify system performance. The sensor systems provide high resolution strain measurements. The information that is gathered from the instrumented structure is intended to monitor performance of the bridge and the FRP/SRP repair and rehabilitation. The bridge will be monitored for the long term and the FOSS measurements will be compared to other NDT approaches. Future improvements to the P-0962 bridge instrumentation are planned including signal processing and filtering capability, enhanced data acquisition technologies, and remote monitoring research. These efforts are aimed at developing a comprehensive structural monitoring system that can provide measurements and assessment of the bridge to management and maintenance personnel.
Embedded fiber optic sensing for bridge rehabilitation
Instrumentation of a reinforced-concrete bridge subject to structural rehabilitation is described. This forty-seven-year-old bridge is located in Dallas County, Missouri and was upgraded using fiber-reinforced-polymer (FRP) sheets and rods. The permanent field instrumentation consists of an array of extrinsic Fabry-Perot interferometric fiber-optic strain sensors and co-located electrical resistance strain gauges. The sensors monitor flexural strain in the concrete, the original steel rebar, and the FRP reinforcement for the deck and beam in the central span of the bridge. The sensor system is designed for long-term health monitoring of the FRP-reinforcement with emphasis on field security and data acquisition. Implementation protocols for site preparation, installation, inspection, and use of fiber-optic sensors are discussed. The optical measurements will be compared to other measurements during the preliminary load testing. The motivation for this work is to demonstrate the implementation and use of fiber-optic-based sensing in field applications. A description of the structure, the installation of a sensor array, and the preliminary test measurements for load-induced strain have been shown. A comparison of FOSS and ESG sensors is given to verify system performance. The sensor systems provide high resolution strain measurements. The information that is gathered from the instrumented structure is intended to monitor performance of the bridge and the FRP/SRP repair and rehabilitation. The bridge will be monitored for the long term and the FOSS measurements will be compared to other NDT approaches. Future improvements to the P-0962 bridge instrumentation are planned including signal processing and filtering capability, enhanced data acquisition technologies, and remote monitoring research. These efforts are aimed at developing a comprehensive structural monitoring system that can provide measurements and assessment of the bridge to management and maintenance personnel.
Embedded fiber optic sensing for bridge rehabilitation
Eingebetteter Faseroptiksensor zur Brückenüberprüfung
Fonda, J.W. (Autor:in) / Watkins, S.E. (Autor:in)
2004
9 Seiten, 13 Bilder, 1 Tabelle, 17 Quellen
(Nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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