THE CONCRETE BRIDGE MAGAZINE

WINTER 2007

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

Issue link: http://www.aspiremagazinebyengineers.com/i/306894

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The reinforcing steel for each pier is designed to help the structure withstand a major seismic event. A circular well-confined column is located at each corner of the pier. 12 | ASPIRE , Winter 2007 This is a bridge for the record books. Now nearly complete, the San Francisco- Oakland Bay Bridge Skyway is a world— class concrete structure for several reasons: • Its precast girder segments are some of the largest bridge segments ever built in the world. The huge segments weigh 300 to 800 tons, whereas more typical segments weigh 40 to 60 tons. • The structure's pre-tied reinforcement cages are among the largest ever set in North America. The pier column reinforcement cages, placed in one section, weigh up to 300 tons. • The bridge has its foundations in deep Bay mud, yet it is close to two major California fault lines and must resist a major earthquake. Built to Resist the Big one by Daniel C. Brown profile San Franci S co-oakland Bay Bridge — Skyway Section / Oakland, CalifO rnia e ngineer T.Y. lin international/Moffatt & nichols, a joint venture Prime contractor kiewit/flatiron/Manson, a joint venture concrete SuPPlierS Pacific Cement, San francisco (precast); rMC lone Star, davenport, Calif. (ready mixed) Preca Ster kiewit/flatiron/Manson, a joint venture conStruction engineer Parsons Transportation Group, Oakland, Calif. PoSt-tenSioning and Segment erection equiPment Schwager davis, inc., San Jose, Calif. ASPIRE_win07.indb 12 12/29/06 1:53:41 PM

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