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OT: Minneapolis Bridge

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jimn:

--- Quote from: KingSparta on September 25, 2007, 02:08:05 pm ---any update on why?

--- End quote ---

All the off-the-cuff theories have pretty much already been vetted through the media. Now everyone is waiting for the NTSB report, which will be released when they are good and ready. Unless one of a couple other investigations release their conclusions earlier.

Our department of transportation has awarded the contract to build the replacement, which is expected to begin the middle of October.

JimN

KingSparta:
From Wikipedia

The New York Times and Washington Post reported on January 15, 2008 that the National Transportation Safety Board investigators had determined that the bridge had a design fault which led to the collapse, that inspection of the bridge could not have prevented. The NTSB reports that the designers had specified that steel gusset plates connecting several girders were undersized and inadequate to support the intended load of the bridge. As the bridge carried more weight over the decades, such as concrete lane barriers, and other dead load, the margin of safety was much less than the original design intent. The addition of tons of construction equipment and material exceeded the inadequate ability of the plates to carry the load. The NSTB recommends that similar bridge designs be reviewed for this problem.

Also From The NTSB

http://www.ntsb.gov/pressrel/2008/080115.html

National Transportation Safety Board
Washington, D.C. 20594
Safety Recommendation

http://www.ntsb.gov/Recs/letters/2008/H08_1.pdf

Note: Although the Board's investigation is still on-going and no determination of probable cause has been reached

But How It Reads, Is The Original Calculations Of The Original Bridge Plans Are In Error, It Seems They Did Not Re-Evaluate The Loads And Bridge Prior To Adding More Loads To The Bridge That Over Stressed The Gusset Plates. You would think this would be done whenever making modifications to a bridge.

hit_ny:
Ain't she pretty :D

bob:
I'll try to take a night picture sometime. It's got a blue cast to it from soft lighting along the edge.

Frobozz:
It looks a lot more pretty than the old bridge.

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