The Homer M. Hadley Memorial Bridge on Interstate 90 in Seattle, Washington is the world’s fifth-longest floating bridge and will soon become the first floating bridge in the world to accommodate a light rail line. Sound Transit, the Washington State Department of Transportation, along with technical experts have been working for over a decade to solve numerous technical challenges of installing light rail on a floating bridge. Join us as we explore the challenges faced with attaching light rail to a floating bridge that include; development of a track bridge to span between the fixed bridges and the floating bridge with movement up and down and side to side of up to two feet, installation of 3,600 lf of longitudinal external post tensioning, and attaching concrete plinths to the floating bridge without penetrations into the bridge deck.
Learning Objectives:
1. Facilitate multiple agency collaboration to resolve technical challenges.
2. Explore why GCCM was selected as the preferred contracting method of project delivery.
3. Develop collaborative teamwork between the contractor and the design team to improve constructability and design function.
Contributor/Source
Brian Kittleson ;John Sleavin P.E.
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