Did heat contribute to the Minneapolis bridge collapse after all?
Monday, October 22nd, 2007I got a little flak when I made a similar suggestion back in August, prompted by my Minneapolis-based brother. So I will try to report as neutrally as possible on an article in the Minneapolis Star Tribune just sent to me by said brother, headlined:
Did heat, rusted plates doom bridge?
Federal investigators are trying to determine whether 91-degree heat caused expansion that put too much pressure on the corroded gusset plates that held the I-35W span together.
What does the article say?
… authorities are analyzing what role the 91-degree heat on Aug. 1 might have played in increasing stress on the already-weakened L-11 gusset plate, which connected four steel beams located near the bridge’s south end.
Like the New Orleans levees that failed during Katrina, this bridge was not well-designed. In particular, it apparently could not handle the consequences of the cold and heat that Minneapolis is subjected to:



