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California’s Bay Bridge Hits Trouble Ahead Of Opening Day

Filed by KOSU News in US News.
May 9, 2013

Faced with lingering safety concerns over the San Francisco-Oakland Bay Bridge’s new eastern span, California transportation officials say it will take more work — and up to $10 million — to get the bridge ready for its planned grand opening on Labor Day.

The problem was recognized after steel rods were tightened to bolt part of the bridge’s seismic safety system to a beam. Of the 96 that were tightened, 32 broke.

Measuring three inches in diameter, the broken bolts were found to suffer from “hydrogen embrittlement,” the project’s engineers say. When the rods were produced in 2008, excess hydrogen was present, making them “susceptible due to the steel being harder on the outside than in the middle, or a lack of uniformity in the steel’s microstructure,” according to the California Department of Transportation.

Engineers say they won’t rely on any of the 96 rods from that batch. Another 192 rods that were made in 2010 are being tested but have so far shown no problems, officials say. All of the bolts were fabricated by Dyson Corp. of Ohio, which “has been making specialty forged products, such as giant bolts for bridges, for more than a century,” The Cleveland Plain Dealer reported last month.

Because the rods, with lengths between 9 and 17 feet, are embedded in concrete in confined spaces, engineers say that replacing them is impossible. Instead, they plan to install steel “saddles” over the two seismic safety devices, along with more than 400 steel cables to hold them down.

The late fix could mean the holiday celebration that was meant to mark the bridge’s opening for traffic will have to be put off.

“We believe the work can get done by Labor Day, but it will require extra shifts and perhaps a 24-hour-a-day operation and that will cost more money,” says the Metropolitan Transportation Commission’s Steve Heminger, reports The Los Angeles Times.

The project has cost $6.4 billion, far exceeding early budget estimates. We’ve reported on the bridge before — most notably, on its being sheathed in an artist’s installation of thousands of LED lights. [Copyright 2013 NPR]

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