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To: Robert A. Cook, PE

The Twin Towers had a lot of weld joints fail where there was no underlying mechanical connection between the beams and the columns. Plus the weld design and materials were questionable.


8 posted on 03/30/2017 5:49:19 PM PDT by Paladin2 (No spellcheck. It's too much work to undo the auto wrong word substitution on mobile devices.)
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To: Paladin2
The Twin Towers had a lot of weld joints fail where there was no underlying mechanical connection between the beams...

They failed because the invisible UV lasers from the MotherShip #19 cut those welds!

/s

76 posted on 03/30/2017 7:20:25 PM PDT by BwanaNdege ("The church ... is not the master or the servant of the state, but the conscience" - Luther)
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To: Paladin2

We had a tank truck crash into a bridge overpass about Exit 112 on I-40 in NC about 18 years ago. The resultant fire caused the steel girders supporting the overpass to collapse.

It took about a year to completely repair the overpass.

I was a Census Taker in 1990. Because the driveway for one address had a chain across it, I had to walk to the top of a mountain to get the occupants to fill the questionnaire. Once there I discovered that there had been a house fire. Very large, fancy house. Later heard that the fire was “suspicious”. The thing I remember most was a steel “I” beam about 30 feet long with about an 18” high Web and 6” Flanges twisted like a piece of linguini.

From the heat of a residential fire.


90 posted on 03/30/2017 7:51:02 PM PDT by BwanaNdege ("The church ... is not the master or the servant of the state, but the conscience" - Luther)
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