West Bay Crossing West Bay Crossing
Seismic Evaluation

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West Bay Crossing
The West Bay Crossing
These back-to-back suspension bridges across San Francisco Bay were built in 1936. Today, they carry more than 250,000 vehicles per day.

OPAC evaluated the two-mile-long tandem suspension bridge West Bay Crossing for Caltrans, to determine seismic vulnerability and retrofitting requirements. The scope of work included the following components:

Final design of retrofitting measures is now underway by Caltrans.

Download a Zipped .Avi file [375K] showing the predicted motions in the middle 20 seconds of the Richter-Magnitude 8+ "maximum credible" event.
Visit the Caltrans Bay Bridge Web Site.
Read a technical paper (1,079 KB), by Mark Ketchum & Fletcher Waggoner, presented at the National Seismic Conference on Bridges and Highways, San Diego, California, Dec. 10-13 1995. This is in Adobe Acrobat (.pdf) portable document format - get the Adobe viewer here if you don't already have it.
Tower base model Key Staff Experience:

Key Project Issues:

Client: California Department of Transportation, Sacramento, California.
Date: Study completed in 1994.
Fee: U.S. $500,000
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