The Canadian Press - ONLINE EDITION

Designer: More than 2,000 Bay Bridge bolts under scrutiny are safe, don't need replacing

  • Print

SAN FRANCISCO - The chief designer of the new, $6.4 billion eastern span of the San Francisco-Oakland Bay Bridge says more than 2,000 bolts and rods on the span that have been called into question are safe and can remain in place, a newspaper reported.

The bolts and rods came under scrutiny after 32 other bolts cracked when they were tightened last year, threatening to delay the span's opening.

But bridge designer Marwan Nader told bridge oversight officials at a meeting Thursday that the other 2,200 bolts and rods on the span are likely to be more corrosion-resistant than the 32 that failed. Although they will need extra protection against corrosion, Nader said the bolts and rods do not need to be replaced, the San Francisco Chronicle reported (http://bit.ly/1o02lDa ).

Nader based his conclusion on tests state transportation officials began conducting last year after the 32 seismic safety bolts broke.

"As engineer of record, I conclude these rods in service are safe," Nader, of T.Y. Lin International, the firm that designed the span, said.

A final decision about replacing the bolts is still pending. But Steve Heminger, chairman of the bridge oversight panel, said he was encouraged by Nader's assessment.

"The testing results, if they are borne out, are very good news," Heminger said.

The oversight panel earlier recommended that 700 bolts and rods be replaced, but Heminger said that will now need to be reassessed.

The 32 bolts that failed secure earthquake shock absorbers to the deck of the bridge. Tests found hydrogen had infected the bolts, which also were made of poor-quality steel, making them brittle. When tightened to high tension, the brittleness gave way, causing the cracks.

Bridge officials found a temporary solution that allowed the bridge to open as scheduled over Labor Day weekend.

Also Thursday, the bridge oversight panel awarded $3 million to deal with some other problems that have surfaced on the new span, including rust-stained white paint and misaligned steel rods.

The new span replaced one built in the 1930s, which was not considered earthquake-safe. The old span was damaged during the 1989 Loma Prieta earthquake.

___

Information from: San Francisco Chronicle, http://www.sfgate.com

Fact Check

Fact Check

Have you found an error, or know of something we’ve missed in one of our stories?
Please use the form below and let us know.

* Required
  • Please post the headline of the story or the title of the video with the error.

  • Please post exactly what was wrong with the story.

  • Please indicate your source for the correct information.

  • Yes

    No

  • This will only be used to contact you if we have a question about your submission, it will not be used to identify you or be published.

  • Cancel

Having problems with the form?

Contact Us Directly
  • Print

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

You can comment on most stories on winnipegfreepress.com. You can also agree or disagree with other comments. All you need to do is be a Winnipeg Free Press print or e-edition subscriber to join the conversation and give your feedback.

Have Your Say

New to commenting? Check out our Frequently Asked Questions.

Have Your Say

Comments are open to Winnipeg Free Press print or e-edition subscribers only. why?

Have Your Say

Comments are open to Winnipeg Free Press Subscribers only. why?

The Winnipeg Free Press does not necessarily endorse any of the views posted. By submitting your comment, you agree to our Terms and Conditions. These terms were revised effective April 16, 2010.

letters

Make text: Larger | Smaller

LATEST VIDEO

Winnipeg Jet goalie Michael Hutchinson

View more like this

Photo Store Gallery

  • JOE.BRYKSA@FREEPRESS.MB.CA Local-(Standup photo)- Humming Around- A female ruby -throated hummingbird fly's through the bee bomb  flowers Friday at the Assiniboine Park English Garden- Nectar from flowers are their main source of food. Hummingbirds wings can beat as fast as 75x times second. Better get a glimpse of them soon the birds fly far south for the winter - from Mexico to South America- JOE BRYKSA/WINNIPEG FREE PRESS- Sept 10, 2009
  • JJOE.BRYKSA@FREEPRESS.MB.CA Local-Postcard  Day-Horror frost and fog created a most beautiful setting at Assiniboine Park Thursday morning in WInnipeg- Enviroent Canada says the fog will lifet this morning and will see a high of -7C-  JOE BRYKSA/WINNIPEG FREE PRESS- Feb 18, 2010

View More Gallery Photos

Poll

What should the legal drinking age be?

View Results

View Related Story

Ads by Google