The gusset plate is the steel plate that ties steel beams together on a bridge. Federal officials say a flawed gusset plate design is a main cause of the 35W bridge collapse. (Photo submitted by Kevin Curley)
The I-35W bridge over the Mississippi in Minneapolis collapsed during rush hour on August 1, 2007, plunging dozens of cars and their occupants into the river.
To learn more about gusset plates and what purpose they serve in the design of a bridge, MPR's Tom Crann talks to Roberto Ballarini, head of the Civil Engineering Department at the University of Minnesota.
Five at 8 - 11/23/09: Consider the source
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