Re: 9/11 may be CONSPIRACY! - BBC anchor!!!!

On Tue, 29 Apr 2008 21:04:43 -0500, sanoli@[EMAIL PROTECTED]
 (O O) wrote:

>The columns were filled with concrete. 
>Without the concrete, they could sway to the point of buckling.
>I get my knowledge of the nature of materials from direct experience,
>not from Hollywood movies.

ROTFLMAO.  You lie like a rug.  The sway in the building was taken
care of by dampers, some 11,000 of them.

http://www.pbs.org/wgbh/nova/wtc/innovation2.html

"Damping the sway As sturdy as these towers would be, Robertson and
Skilling knew they would still be flexible in high winds. Indeed, they
designed them to be so. But they realized the swaying effect,
especially in strong gusts, might bother tenants high in the building.
So they fa****oned yet another innovation, a state-of-the-art damping
system. Like door closers or car shocks, the dampers absorbed the
wind's punch, easing the towers one way or the other so smoothly that
office workers hardly noticed the movement.

Each of the Twin Towers had 11,000 built-in shock absorbers to lessen
the buildings' sway in strong wind.
The dampers were made of visco-elastic material. "These are materials
that are partially viscous, that is, partially flowable like oil, and
also elastic, which means they act somewhat like steel, in that if you
strain them they return to their original shape," Robertson says. "So
the material is in between those two materials -- it's not like oil,
it's not like steel, it's visco-elastic."

Robertson's crew placed the dampers, 11,000 of them in each building,
between the bottom of the floor trusses and the columns -- two parts
of the building that tended to move with respect to each other when
the edifice swayed. When it did so, those two parts would shear the
visco-elastic dampers. This shearing caused the material to heat up,
and that heat was transferred to the building. "So we take the energy
of the wind, and we heat the building with it," Robertson says with a
note of pride in his voice."