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/306849
Illinois State Toll Highway Authority officials faced a key challenge in planning to widen and rebuild portions of the I-88 Reagan Memorial Tollway in North Aurora, Ill. The roadway's bridge over the Fox River featured the tollway's only arch bridge, and they hoped costs would prove economical enough that they could add a second bridge with a similar design alongside for the extra lanes. Ultimately, the selected concrete design proved so impressive that the Illinois Tollway decided to replace the existing bridge with a new one, too. The project's goal was to increase capacity on the tollway in each direction to three lanes from two. The plan was to use the existing arch bridge, which opened in 1958, to carry three lanes of westbound traffic, while the new structure would carry three lanes of eastbound vehicles. To achieve this economically, the Illinois Tollway used a performance-based delivery system similar to the design- build format used in other states and requested two distinct bid alternatives from design-build firms. profile FOX RIVER BRIDGE / NORTH AURORA, ILLINOIS ENGINEER: Janssen & Spaans Engineering Inc., Chicago, Ill., and Bowman, Barrett & Associates Inc., Chicago, Ill. GENERAL CONTRACTOR: James McHugh Construction Co., Chicago, Ill. PRECASTER FOR GIRDERS: Prestress Engineering Corp., Prairie Grove, Ill., a PCI-certified producer AWARDS: Top 10 Bridges in North America, Roads & Bridges magazine Concrete design replicates existing arch bridge so well that officials also replace original One design bid alternate provided parameters for an arch bridge that would closely match the shape and construction of the existing arch bridge. The second design bid alternate was to focus on a simple concrete bridge consisting of typical beams and piers, with no elaborations. But that bid also had to include a $3-million noncompensable adjustment for selecting the simple bridge type. McHugh/Janssen & Spaans investigated both alternatives and concluded that the arch structure could be designed and constructed within the $3-million p r e m i u m a l l o w e d f o r t h e m o r e aesthetically pleasing arch structure. They submitted this alternate in their bid package, which was selected as the best combination of aesthetics and economics. McHugh served as the team leader for the project. Five Arch Spans The new 1345-ft-long bridge comprises 10 spans. Five spans use cast-in-place columns and bent caps supporting 10 by Brian Slagle, Janssen & Spaans Engineering Inc. and Michael Gould, James McHugh Construction Co. ARCH OF TRIUMPH The 10-span bridge features five spans of precast concrete Illinois I-girders plus five spans of concrete arches. 34 | ASPIRE , Summer 2009 ASPIRE_Summer09.indb 34 6/5/09 1:55:10 PM