Project Details

Client: American Bridge – Fluor JV (Main Span); Kiewit/FCI/Manson JV  (Skyway, Pier T1 Base & Main Tower)
Location: San Francisco Bay Area, California, U.S.
Capex: $6.5 billion
Project duration: 2002-2013
Owner: California Department of Transportation (CALTRANS)
Design firm: T.Y. Lin International (TYLI)/Moffatt & Nichol JV
Architect: MacDonald/Weidlinger JV
Engineer: T.Y. Lin International (TYLI)
Contractor: The American Bridge/Fluor Joint Venture (ABFJV)

Project Stats

  • The East Span set a new record for its self-anchored suspension span of 1,263 feet
  • Designed to withstand the strongest ground motions engineers can expect in the next 1500 years
  • The first cable-supported bridge to use seismic energy-absorbing shear link beams in its tower
  • The East Span is the first suspension bridge to have no connection from deck to tower
  • Features the longest looped suspension cable ever used for a bridge, measuring at 4,550 feet long
  • The skyway uses precast girder segments weighing up to 750 tons each making them the largest ever built in the world
  • State-of-the-art hinge pipe beams were designed and built at the expansion joints and between bridge frames

Scope of Work

  • The world’s largest Self-Anchored Suspension Span (SAS)
  • The deck is comprised of 33,000 tons of orthotropic tub girders weighing up to 1,700 tons each
  • The main suspended span is 2,047 feet and the single steel tower is 525 feet high
  • Built to replace the cantilever bridge destroyed in the 1989 Loma Prieta Earthquake
  • Due to a design/fabrication issue, Candraft had to detail the projects as “Design-Build”
Skyway Viaduct
  • East/West bound lanes detailed by Candraft using AutoCAD
  • 3,200 tonnes East/West Lane
Pier T1 (Tower) Base
  • ïBase segments detailed by Candraft using Tekla
Main Span Tower
  • Lower portions of tower detailed by Candraft using Tekla
  • Upper portion of tower detailed by ZPMC
Main Span
  • Span 1 thru to Span 11 inclusive detailed Tensor Engineering
  • Span 12 thru to Span 14 inclusive detailed by Candraft using AutoCad. Anchor Plate
  • Assembly modeled in Tekla detailed using AutoCAD
  • 7,550 tonnes Span 12 thru to Span 14 inclusive, CB17, CB18 & CB19

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Highlights & Challenges

  • Geometry & design issues pushed out schedule detail/fabrication completion dates
  • Original design specified Segments 13 & 14 had to be orientated radially due to fabrication restrictions, these segments were detailed and fabricated kinked (segmented), thereby increasing the number of pieces required
  • “EOR” & contractor sent representatives to our offices to help expedite design/fabrication issues

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