THE CONCRETE BRIDGE MAGAZINE

FALL 2010

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/319569

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When the Oregon Department of Transportation (ODOT) undertook a major interchange improvement at I-5 and Beltline Highway in Lane County, Ore., the project also required p e d e s t r i a n a n d b i c y c l e m o b i l i t y improvements. A number of structure types could have effectively spanned the interstate highway that separates the cities of Eugene and Springfield. However, this major improvement project stood out as an opportunity to provide the communities with a noteworthy landmark structure. The design team collaborated to d e v e l o p a n i c o n i c c a b l e - s t a y e d pedestrian bridge located immediately s o u t h o f t h e i m p ro v e d h i g h w a y interchange. The cable-stayed bridge type helped the designers deliver a s l e e k s t r u c t u re t h a t w a s b o t h rapidly constructable and extremely economical. OBEC Consulting Engineers and Jiri Strasky have successfully demonstrated the feasibility of this cable-supported bridge type on three other signature pedestrian bridges in the area. Adding the highly visible I-5 Gateway Pedestrian Bridge to the local bike and pedestrian system supported a unified theme and extended the area's already unique and inspiring biking and walking experience across the highway. The minimal and functional design is a direct result of the team's belief that a bridge is a sculpture; that the public appreciates and intrinsically recognizes elegance and simplicity of form as the essence of good design. As such, the bridge itself becomes public art. The team accomplished the efficient bridge design by drawing upon the experience gained during several long- span cable bridge projects in western Oregon. The team's broad experience profile I-5 GATEWAY PEDESTRIAN BRIDGE / EUGENE AND SPRINGFIElD, o REG oN B r IDge DesIgn engIneers: oBEc consulting Engineers, Eugene, ore., and Jiri Strasky, consulting engineer, Greenbrae, calif. pr I me contrActor: Mowat construction company, Woodinville, Wash. concrete suppLIer AnD precAster: Knife River corporation, Harrisburg, ore., a PcI-certified producer post-tensIonIng contrActor: Schwager Davis, San Jose, calif. B rIDge DescrIptIon: 503-ft-long, 14-ft-wide cable-stayed pedestrian bridge with 103-ft-long main spans using precast concrete deck panels, precast concrete central tower, and 30-ft-long concrete approach spans by Larry Fox and Gary Rayor, OBEC Consulting Engineers The I-5 Gateway Pedestrian Bridge economIcAL eLegAnce the I-5 gateway pedestrian Bridge used precast concrete deck panels supported by high-strength steel bars as stay cables. photo: oBec consulting engineers. 28 | ASPIRE , Fall 2010 ASP10-1704.indb 28 9/17/10 2:06 PM

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