THE CONCRETE BRIDGE MAGAZINE

SUMMER 2011

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/306186

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The Nalley Valley Interchange in Tacoma, Wash., is a major reconstruction of an interchange originally opened to traffic in 1971. It is being redesigned and reconstructed in several design- bid-build packages that will extend over several years. The westbound viaduct is the "jumping off point" for motorists on I-5 heading west to the Tacoma Narrows Bridge and the Olympic Peninsula on State Route 16. Because this SW Line flyover was first bid as a steel box girder bridge and ended up as the Washington State Department of Transportation's (WSDOT) first precast concrete segmental bridge, the project proved to be a "jumping on point" for WSDOT as well. Volatile steel prices at bid time in October 2008 were the primary incentive for Guy F. Atkinson Construction LLC, Renton, Wash., to consider redesigning the two steel bridges on the project. However, this "first" use of a precast segmental bridge would not have happened without the contractor's and owner's desire to advance segmental precast concrete technology in the state. This article describes two redesigns. The second is described in the sidebar. profile SW LINE FLYOVER BRIDGE, NALLEY VALLEY INTERCHANGE / TACOMA, WASHINGTON GENERAL C oNTRACToR: Guy F. Atkinson Construction LLC, Renton, Wash. vALuE ENGINEERING DESIGN: McNary Bergeron & Associates, Broomfield, Colo. INDEPENDENT DESIGN REvIEw AND CoNSTRuCTIoN ENGINEERING: Campbell Construction Engineering LLC, Redmond, Wash. by Jeremy Johannesen, McNary Bergeron & Associates The Westbound Nalley Valley Interchange SW Line Flyover Bridge and Temporary Eastbound Bridge The SW Line Flyover Bridge nearing completion in the center of the photo. Photo: Guy F. Atkinson Construction LLC. 22 | ASPIRE , Summer 2011 Book_Sum11.indb 22 7/1/11 9:59 AM

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