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/297000
Ensuring that all needs are satisfied on complex bridge projects creates challenges that can be difficult to meet. With the $18.6-million Gold Line Bridge in Arcadia, Calif., designers not only faced meeting the needs of several overlapping gover nmental bodies, but also incorporated a number of innovative design techniques for the first time in the state. They accomplished those goals while producing a dramatic aesthetic appearance that reflects the area's heritage. "This was a truly collaborative process," says Habib F. Balian, chief executive officer of the Metro Gold Line Foothill Extension Construction Authority. "We learned that much can be accomplished, very economically, with early planning, the right team, and the community's support." The 584-ft-long, dual-track bridge, which spans the eastbound I-210 freeway, kicks off a $735-million, 11.5- mile light-rail project from Pasadena to Azusa. The bridge connects the existing Sierra Madre Villa station in Pasadena and the future Arcadia station—the westernmost of six planned stations. The bridge features three spans of 8-ft 10-in.-deep cast-in-place, post- tensioned, three-cell, concrete box girders, with span lengths of 144, 220, and 220 ft. The deck is 33-ft 11-in.- wide to accommodate two light-rail tracks and a center emergency walkway. The superstructure is supported by an outrigger bent cap that spans I-210, a single column bent, and the abutments at each end. The project required 6500 yd 3 of concrete, and 1,300,000 lb of reinforcement. Total post-tensioning force for the superstructure exceeded 30,000 kips. V i s u a l l y a r r e s t i n g , t h e b r i d g e 's superstructure features a rounded underside, with a serpentine design along its length consisting of grooves and hatch-marks visible from I-210. Column tops were constructed of profile GOLD LINE BRIDGE / ARCADIA, CALIF. BRIDGE DESIGN ENGINEER: AECOM, Los Angeles, Calif. DESIGN CONCEPT ADVISOR/ARTIST: Andrew Leicester, Minneapolis, Minn. PRIME CONTRACTOR: Skanska USA Civil West, Riverside, Calif. CONCRETE SUPPLIER: National Ready Mix, Irwindale, Calif. PRECASTER: Moonlight Molds, Gardena, Calif.; placement of precast units performed by Masonry Concepts, Santa Fe Springs, Calif. POST-TENSIONING CONTRACTOR: Dywidag Systems International, Long Beach, Calif. OTHER MATERIAL SUPPLIERS: Reinforcement–CMC Rebar, Fontana, Calif.; Spherical Bearings–D.S. Brown, North Baltimore, Ohio; Expansion Joint Seal Assemblies–American Sheet Metal, Anaheim, Calif.; Formliners–Fitzgerald Formliners, Santa Ana, Calif.; and Prefabricated Wood Forms–Squires Lumber, Colton, Calif. The $18.6-million Gold Line Bridge in Arcadia, Calif., features a variety of structural innovations to go with its dramatic aesthetic look. All photos: Metro Gold Line Foothill Extension Construction Authority. GOLD LINE BRIDGE Balancing structural needs, conficting requirements, and aesthetics by Craig A. Shutt 22 | ASPIRE , Spring 2013 P R O J E C T AspireBook_Spr13.indb 22 4/1/13 11:02 AM