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PTH 23 over the Red River

Rehabilitation design of a four-lane, nine-span steel girder bridge

Winnipeg, Manitoba

Design of this project was completed in accordance with the latest edition of the AASHTO LRFD Bridge Design Specifications and an HSS-30 truck loading configuration. It also accounted for potential movement of the piers along the river banks. The project involved the detailed design and detailing of full depth full width concrete panels composite with steel girders over a total of two simply supported spans on each of the approach spans and a total of five continuous spans.

The design of the panels specified lateral prestressing for handling and incorporated inserts for cast-in-place barriers on either side of the bridge as well as for a curb on the sidewalk. Transverse joints connecting adjacent panels were designed to account for the development of reinforcement in both positive and negative moment regions. Composite action was achieved with shear connector groups that required shear pockets within the reinforcing mats without negatively influencing structural integrity, durability and constructability. Due to variations in span lengths along the bridge, closure pours were designed over the piers and at the abutments to ensure the total number of panels was optimized for ease of fabrication. The deck joints within the closure pours were also detailed to accommodate for a wearing surface within the simply supported spans. Structural Health Monitoring was incorporated into the structure including weigh in motion sensors.

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