Three steel bridges located on a remote stretch of Interstate 15 in northern Arizona are currently the subject of a study involving inspection, load testing, long-term instrumentation and remote structural health monitoring. The project is being funded by the Arizona Department of Transportation (ADOT) through a FHWA Accelerated Innovation Deployment Grant.
The purpose of the project is to utilize state-of-the-art structural health monitoring (SHM) systems to provide actionable information that will ensure the safety of the traveling public and provide real, practical data to assist ADOT in short-and-long-term decision making about these significant and remote bridges. The systems include strain gages, crack growth detection sensors, temperature sensors, acoustic emissions, traffic detection, and cameras with a remote data logging system transmitting data to a website. The website allows elements of the bridge to be monitored remotely by ADOT in real time, and the functionality of the website will also be demonstrated live. These bridges demonstrate widespread fatigue and distortion-induced cracking in primary steel members which has been monitored by conventional methods during past visual inspections.
The presentation will provide a status update on the project which began in 2016 and is ongoing through 2020. The presentation will include a history of the bridges, visual inspection efforts & documentation, analytical modeling work, load testing and instrumentation, instrumentation selection, fatigue analysis, site & other challenges, and long-term monitoring strategies, including development of the monitoring website. The presentation will include perspectives of ADOT, the bridge owner; Burgess & Niple, the prime bridge engineering firm; and BDI, the SHM specialists.