"How is this bridge still standing?”
That was the initial reaction of Aaron Stover, Michael Baker International’s vice president and regional bridge practice lead, as he first studied images of a fractured tie beam that forced the May 11 emergency shutdown of the I-40/Hernando de Soto Bridge between Tennessee and Arkansas. Discovered by chance earlier in the day during MBI’s routine above-deck inspection, the fracture on the bridge’s eastbound span affected nearly half the cross-section of a 26-in. by 33-in. welded girder supporting one of the 50-year-old structure’s 900-ft-long, 100-ft-high arched navigation spans across the Mississippi River.
Reprinted courtesy of Jim Parsons, Engineering News-Record
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