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Thread: NEW San Francisco-Oakland Bay Bridge

  1. #1
    Disgruntled Optimist lofter1's Avatar
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    Default NEW San Francisco-Oakland Bay Bridge

    The San Francisco-Oakland Bay Bridge

    Known locally as The Bay Bridge, this 4.5 mile structure spans the San Francisco Bay and links the Californian cities
    of Oakland and San Francisco.

    The bridge consists of two major segments connecting a central island, Yerba Buena Island, with each shore.
    The western segment terminating in San Francisco consists of two suspension bridges end-to-end with a central anchorage.
    The eastern span terminating in Oakland consists of a truss causeway, five medium-span truss bridges and a double-tower cantilever span, scheduled to be replaced by an entirely new structure now under construction.

    The original bridges were designed by Ralph Modjeski. The Bay Bridge opened for traffic on November 12, 1936, six months before San Francisco's other famous bridge, the Golden Gate.

    (Wikipedia: http://en.wikipedia.org/wiki/San_Fra...d_construction)


    The Bridge

    A bridge of superlatives. It will boast the world's first single-tower self-anchored suspension span and some of the largest and heaviest components ever seen in bridge-building, all assembled by the biggest equipment ever seen on the Bay. One section alone, the $1.04-billion Skyway, is by far the largest single construction contract ever awarded by the state of California.


    For info, photos, specs, history: http://www.newbaybridge.org/




    Renderings of the New San Francisco-Oakland Bay Bridge (Scheduled for completion in 2012 at a cost of $6.3 Billion)







    Why A New Bridge?

    On October 17, 1989, the tremors of the Loma Prieta earthquake signaled the beginning of the end for the eastern span of the San Francisco-Oakland Bay Bridge. The 7.1 quake severely damaged the 1930s-era double-deck truss structure, knocking down a portion of the upper deck, killing one motorist and tragically exposing the span's weakness.





    With the bridge out of service for a month, Caltrans inaugurated a study to determine if the bridge could withstand another earthquake. For sure, another quake is coming. Seismic experts say a major temblor is likely to occur in the next 30 years - a ominous finding for the bridge, considering it lies in harm's way just a few miles from the San Andreas and Hayward faults.

    Caltrans determined that while the western side of the bridge from San Francisco to Yerba Buena could be retrofitted to withstand a major quake, it would be far more cost-effective in the long run and safer to build a new eastern span rather than retrofit it. Built according to 1930s codes, the bridge was designed for what today are merely minimal seismic impacts. The wooden timbers on which the bridge piers stand leave the bridge increasingly vulnerable over time.

    To bring the bridge up to modern standards would be relatively too expensive, unreliable and extremely difficult given today's traffic levels. And while seismic safety is the primary consideration for the new east span, additional traffic safety issues are also important. The existing structure does not conform with current traffic standards. The new east bridge is designed to meet current standards for roadway shoulders, lane widths, stopping sight distances, and other factors, helping to substantially improve public safety.


    The original East Bay span of the Bridge, under construction in 1935 (scheduled for demoliton 2007):




    Last edited by lofter1; October 14th, 2005 at 02:11 AM.

  2. #2
    Chief Antagonist Ninjahedge's Avatar
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    Default

    *cough*
    http://www.wai.com/Transportation/Br...baybridge.html
    *cough*


    It always annoys me when even guys that are DEAD that had nothing to do with the design are mentioned before the engineers that designed the actual structures.

    Even interior design firms get more recognition!

  3. #3
    Crabby airline hostess - stache's Avatar
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    Default

    They really get going about this project on craigslist. Lots of people are very upset about the cost.

  4. #4

    Default

    any construction pics or has it not started yet?

  5. #5
    Disgruntled Optimist lofter1's Avatar
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    Default

    A Replacement Bridge Rises on the Bay

    NY TIMES

    February 6, 2012

    VIDEO


    The new eastern span of the San Francisco-Oakland Bay Bridge has several elements to help it withstand a major earthquake. The central feature of the span is a 2,047-foot-long single-tower self-anchored suspension bridge of a asymmetrical design.

    The descriptive text didn't come through in the copy + paste ...


    By MIKA GRÖNDAHL and XAQUÍN G.V.

    Sources: T.Y. Lin International; California Department of Transportation; Newlands & Company

    © 2012 The New York Times Company

  6. #6
    Crabby airline hostess - stache's Avatar
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    Default

    Made in China.

  7. #7
    Disgruntled Optimist lofter1's Avatar
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    Default

    Fingers crossed for future crossings.

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