houlepn@attglobal.net wrote:

BornN2BS wrote:

houlepn@attglobal.net wrote:

BornN2BS wrote:

Here's a corollary to that one: Softened steel will not carry as
much load as it did before the hardened steel absorbed enough
heat to soften it.  (Compare this, roughly, to male anatomy if
you like.)

Bullshit detector going crazy!!! There was no softened steel.

Steel looses half its strength at 600C degree.

There is
NOTHING you can post here to explain how fire in the WTC softened ANY
steel.  Pure conjecture that is just another meaningless distraction.
Burning jet fuel is hotter than a forced air mixture of oxygen and
acetylene too, I guess.

Do you believe there is a temperature significantly lower than
600C such that stuff (fuel, furnitures, carpeting, etc.) stop
burning when it is reached?

You are implying that there were fires burning at 600 degrees Celcius.
Would you mind elaborating on that? What was burning? Are you claiming
that furniture, carpeting, and other materials inside the WTC burned
hotter than the fuel?

Temperatures attained in typical residential fires are in the 500C-650C
range as you can verify in such standard references as D. Drysdale,
"An Introduction to Fire Dynamics", and A.E. Cote, ed. "Fire Protection
Handbook 17th Edition". It would be surprising that the mere addition
of fuel would keep the fire from reaching a temperature which is
a common occurrence smaller residential fires.

Steel beams function as a heat sinks so that normal fires that
spread slowly from a localized source and burn most fiercely on
one floor at a time pump heat in the beams which gets dissipated
along them.

The main effect of some 10000 gallons of fuel being sprayed all at
once over a huge area of a few floors of the WTC was to spread the
fire very fast. Hence, beams in the middle of the inferno couldn't
dissipate heat as effectively towards cooler regions. (Heat conduction
is a matter of gradient.) This allowed them to attain close to the
ambient temperature that must have been in excess of 600C if the
fire was anything like typical (and probably much more at places.)
That is enough already to weaken steel significantly.

Carefully watch the video footage of the second WTC tower being
impacted. Most of the jet fuel explodes OUTSIDE of the tower, sir. I
imagine in all of your studying and referencing you must have merely
overlooked this tidbit of information.