United States Department of Transportation
i
Structural Health Monitoring of Highway Bridges Subjected to Overweight Vehicles, Phase II – Field Deployment
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2019-07-01
[PDF-6.66 MB]
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Edition:Final, January 31, 2017 to July 31, 2019
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Abstract:This report describes Phase II of a research project to develop a structural health monitoring system for highway bridges subjected to overweight trucks. Two field tests were conducted. The Laramie River bridge, located at mile post (MP) 312.33, on Interstate-80 (I-80), in Laramie, Wyoming, was tested to evaluate bridge behavior and to develop a prototype structural health monitoring system using fiber optic sensors based on fiber Bragg gratings. The field test validated the accuracy of the fiber Bragg grating fiber topic sensors, but it revealed that the fiber optic sensors, cables, and interrogator system components developed in the laboratory during Phase I of the research project have several challenges when employed in the field. The Bear River bridge located at MP 5.87 on I-80 in Evanston, Wyoming was tested to evaluate bridge behavior and to prepare for deployment of an improved structural health monitoring system. The improved structural health monitoring system minimizes signal loss and sensor detachment, allows for reconfiguration of sensors, facilitates removal of the system, handles rough continuous data streams, collects, filters, stores, packages, and transmits data via cellular service for long-term storage and post-processing. A triggering system was developed that utilizes passive or active wireless communication techniques. The structural health monitoring system was deployed and operated at the Bear River bridge.
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