Monday, September 22, 2014
FAIRFIELD-SUISUN, CALIFORNIA
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Designer: Bay Bridge bolts don’t need replacing

Bay Bridge Broken Bolts

FILE - This Dec. 26, 2013 file photo shows the new eastern span of the San Francisco-Oakland Bay Bridge reflected on the water in a view from Treasure Island in San Francisco. On Thursday, July 24, 2014, Marwan Nader, the chief designer of the new span told bridge oversight officials at a meeting that more than 2,000 bolts and rods on the span do not need to be replaced after 32 other bolts cracked when they were tightened last year. (AP Photo/Marcio Jose Sanchez, file)

By
From page A5 | July 26, 2014 |

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

The Associated Press

The Associated Press

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  • BobJuly 26, 2014 - 7:29 am

    The bolt cracked, that means it's BROKEN! So YES it needs to be replaced, Here's the catch, THEY CANT FIGURE OUT HOW TO REMOVE THEM! Let alone put them back. Everything Caltrans has touched they've messed up from the start. I could bring forward 20 friends with stories that would shock you. Personally I haven't driven over the bridge and not sure I plan to after all I only spent my life building bridges and highrises. Watch, 5-10 years down the road the bridge will have serious rust problems as well as further bolt breakage. Just a guess But a guess based on working with the big c and watching them lie about pre job info like "there's NO LEAD in the overpass we want you to install steel on. YES there was So once agin they might be lying Good luck

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