[Phys-L] Re: Here we go again. WTC brought down by aircraft, not.

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 01:06 AM 11/17/2005, you wrote:
>   Dr.Marshall notes
> the non-standard construction of the towers, whose truss system was
> devised for  convenience during construction " the trusses were
>  lightweight and easy to raise  hundreds of feet in the air during
> construction.
///
> bc


The floor trusses were welded tube. The design was pushed through
despite the designers' reservations. A single person with a step ladder
  and a hack saw would be capable of destroying the truss's integrity.
No explosives required.Some of the spray insulation was
  subsequently removed as a health hazard.

The crucial fire resistance of the center pillar intended to carry the
  gravity load  was unprotected plaster board - which a
single kick of a boot is sufficient to puncture. No aircraft required.

I take it that a physicist such as a BYU physics prof might also ask for
  further investigation if he heard that a decent wood pillar is more
fire-resistant than a steel rolled section of equivalent compressive
  strength.
That is to say: expertise in one field does not necessarily transfer.


Brian Whatcott    Altus OK    Eureka!
_______________________________________________
Phys-L mailing list
Phys-L@electron.physics.buffalo.edu
https://www.physics.buffalo.edu/mailman/listinfo/phys-l