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Structural health monitoring of bridges in the State of Connecticut

Chengyin Liu^1,2 , Joshua Olund ², Alan Cardini ^2,3 ,Paul D¡¯Attilio  ⁴, Eric Feldblum ⁴ and John DeWolf  ²

1. WSP-SELLS Inc., Briarcliff Manor, NY 10510, USA
2. Department of Civil and Environmental Engineering, University of Connecticut, 261 Glenbrook Rd, Unit 2037, Storrs,
CT 06269, USA
3. DMJM Harris, Boston, MA 02110, USA
4. Connecticut Department of Transportation, 280 West Street, Rocky Hill, CT 06067, USA

Abstract: A joint effort between the Connecticut Department of Transportation and the University of Connecticut has
been underway for more than 20 years to utilize various structural monitoring approaches to assess different bridges in
Connecticut. This has been done to determine the performance of existing bridges, reine techniques needed to evaluate
different bridge components, and develop approaches that can be used to provide a continuous status of a bridge¡¯s structural
integrity. This paper briely introduces the background of these studies, with emphasis on recent research and the development
of structural health monitoring concepts. This paper presents the results from three different bridge types: a post-tensioned
curved concrete box girder bridge, a curved steel box-girder bridge, and a steel multi-girder bridge. The structural health
monitoring approaches to be discussed have been successfully tested using ield data collected during multi-year monitoring
periods, and are based on vibrations, rotations and strains. The goal has been to develop cost-effective strategies to provide
critical information needed to manage the State of Connecticut¡¯s bridge infrastructure.

Keywords: structural integrity; structural health monitoring; ield data; vibrations