Field Demonstration of an Innovative Box Beam Connection - TR-743

(2023) Field Demonstration of an Innovative Box Beam Connection - TR-743. Transportation, Department of

TR-743 Final Report, Field Demonstration of an Innovative Box Beam Connection.pdf

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TR-743 Tech Brief, Field Demonstration of an Innovative Box Beam Connection.pdf

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The objective of this project was to demonstrate the field implementation of an innovative longitudinal joint design developed during a previous phase of research. To achieve this objective, a yet-to-be-constructed box girder bridge in Washington County, Iowa, was selected to demonstrate the construction and performance of the joint. In order to evaluate the joint’s performance, a seven-day period of field monitoring was conducted shortly after construction was completed. In addition, long-term evaluation of the joint was performed through the completion of live load field tests and deck concrete crack inspections. The live load tests were performed every 12 months, and crack inspections of the bridge deck were performed every six months. During the field tests and monitoring, temperature, strain, and displacement data were collected at critical locations and analyzed to evaluate joint performance with respect to cracking resistance and load distribution. The results indicate that the innovative joint is sufficient to resist early-age longitudinal joint cracking. Joint cracks that were seen on another box girder bridge with traditional narrow joints were not observed in this case. The innovative joint performed well with respect to load distribution. The whole bridge superstructure behaved as an integrated structure regardless of the transverse location of a passing truck. In addition, the box girder bridge was constructed using integral abutments, which added transverse restraint and positively affected the strain distribution at the joint ends.

Item Type: Departmental Report
Keywords: adjacent box girder bridge—box beam connection—early age concrete performance—field testing—Type K cement
Subjects: Transportation > Pavements > Concrete
Transportation > Bridges and tunnels
Transportation > Research
ID Code: 44704
Deposited By: Iowa DOT Research
Deposited On: 13 Jun 2023 14:03
Last Modified: 13 Jun 2023 14:03