THE CONCRETE BRIDGE MAGAZINE

SPRING 2008

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/306882

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In December 2002, a railroad tanker c o l l i s i o n c a u s e d a f i r e u n d e r a prestressed concrete girder bridge crossing the Puyallup River in Tacoma, Washington. The bridge, constructed in 1997, had span lengths of 146 ft with W74 girders spaced at 5-ft 0-in. centers. Specified 28-day concrete strengths were 7000 psi in the girders and 5000 psi in the columns and bridge deck. The fire consumed 30,000 gallons of methanol, engulfed Span 8, and maintained a high flame temperature for approximately 1 hour. The bridge was closed immediately pending further inspections. The bridge displayed no unusual deflections or misalignments and was reopened to commuter traffic and legal weight trucks on the morning after the fire. Visual Inspection and Mapping Visual inspection of both columns at Pier 9 approximately 60 ft from the source of the fire, showed 2-in.-deep spalls that exposed spiral reinforcement for the full height of the column. The concrete inside the spiral sounded like delaminated concrete. Further investigation revealed delaminations A CAse study by Richard B. Stoddard, Washington State Department of Transportation Evaluating 24 | ASPIRE , Spring 2008 ASPIRE_spring08.indb 24 3/24/08 1:33:08 PM

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