Seismic Retrofit

West Mission Bay Drive is a primary arterial link between the communities of Point Loma, Ocean Beach, and Pacific Beach, in the City of San Diego. The West Mission Bay Drive Bridge traverses the main channel of Mission Bay between Dana Point and Pacific Beach. The structure is 1,200' long pre-cast concrete girder bridge build on eight caps, supported by 16 columns, with two columns per bent, each column supported by four existing batter pile per footing.

This project, with Tralyor Pacific as General Contractor, jointly funded by Caltrans, FHWA, and the City of San Diego, is the seismic retrofit of the existing structure. The scope of this project involves a substantial retrofit of the existing footings, as well as stiffening of the existing columns, the addition of restrainers at the hinges, and concrete catcher beams at the abutments.

The sixteen columns on this structure called for the addition of tightly spaced #8 hoops from top to bottom with the addition of 8-inches of new cast-in-place formed concrete. Truesdell Corporation was able to convince the owner to allow the placing of column concrete by shotcreting. First a prototype mockup of one of the projects columns was constructed and shot in Phoenix, Arizona. After the mockup was successfully shot, and accepted by the Resident Engineer, Truesdell was allowed to conditionally shoot the first two of sixteen columns. Truesdell was successful and was allowed to shoot all sixteen columns with shotcrete. Placement of the column concrete by shotcreting reduced the overall cost to the project and improved the column schedule by eliminating the placement and stripping of forms, and allowing the column work to progress independent of the footing retrofit work.

 


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