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/485551
PROJECT Tilikum Crossing, Bridge of the People New light-rail structure over the Willamette River to open in the fall of 2015 by Norman Smit and David Goodyear, T. Y. Lin International, and Aaron Beier, Kiewit Infrastructure West Co. Nestled between the Marquam Bridge to the north, and the Ross Island Bridge to the south, the Tilikum Crossing is a new structure spanning the Willamette River in Portland, Ore. This is the first new crossing of the Willamette River since the Freemont Bridge was constructed in 1973. This unique cable-stayed bridge is designed to accommodate the multimodal transportation needs for the sponsoring agency, TriMet, and is a critical link across the Willamette River for the new 7.3-mile light-rail transit (LRT) connection between Portland and Milwaukie. The new extension of the LRT system is expected to serve over 25,500 weekday riders by 2030. The owner, in collaboration with the designbuild team, has completed the new bridge on schedule so the LRT extension can open to riders in 2015. Bridge Type Selection The alignment of the new LRT extension was finalized in 2008, and a citizen’s advisory committee was formed to consult with the owner as to the bridge type, geometry, and architecture of the new bridge. The design was chosen by the owner prior to executing the contract to complete the final design and construction of the bridge. The two-year advisory process resulted in a cable-stayed bridge being chosen to span the Willamette River. The preliminary design was completed in 2010. Design-Build Delivery Method TriMet chose the design-build delivery method for the bridge because the critical path for delivering the LRT extension to Milwaukie ran through the design and construction of the new Tilikum crossing. To open the new LRT line by 2015, it was essential that the bridge had to be completed by August 2014. The following were the critical milestones for the project: • Type selection—February 2009 • Design-build contractor selected— October 2010 • Final bridge design begins—January 2011 • Bridge construction begins—July 2011 • Final bridge design complete— August 2012 • Bridge turned over to owner for systems installation—August 2014 • Systems installation and testing complete—October 2015 PROFILE TILIKUM CROSSING, BRIDGE OF THE PEOPLE / PORTLAND, OREGON BRIDGE DESIGN ENGINEER: T.Y. Lin International, Olympia, Wash. OWNER’S ENGINEER: HNTB Corporation, Bellevue, Wash. OWNER’S ARCHITECT: Donald McDonald, San Francisco, Calif. QUALITY CONTROL: Cooper Zietz Engineers, Portland, Ore. PRIME CONTRACTOR: Kiewit Infrastructure West Co., Vancouver, Wash. POST-TENSIONING SUPPLIER: Schwager-Davis, San Jose, Calif. CABLE-STAY SUPPLIER: Freyssinet, Rueil Malmaison, France FORM TRAVELER DESIGN: Parkin Engineering, Vancouver, Wash. BEARING SUPPLIER: R.J. Watson, Buffalo, N.Y. B