Curt wrote:
> Henry, how did you enjoy the pear juice? I had to laugh at how much the
> cats enjoyed your demonstration of building a house of cards and then
> simulating a controlled implosion, was it?
WTF?
http://11syyskuu.blogspot.com/2006/0...-of-wtc-7.html
The Destruction of WTC 7
Latest updates:
5 Sept. 2006:
NIST postpones its report until 2007, will consider if explosions occurred
25 Sept. 2006:
A demolition expert and two structural design professors conclude WTC 7
was a controlled demolition
World Trade Center 7 was a steel-framed skyscraper completed in 1985. It
was located 110 meters (350 feet) away from the closest of the Twin
Towers. The building's tenants included the CIA, the U.S. Securities &
Exchange Commission, the Internal Revenue Service, several banks, and
the Mayor's Office of Emergency Management.
No airplane hit WTC-7, but its south facade and southwest corner were
damaged by debris ejected from the North Tower, which collapsed at 10.30
am. It was reported on fire at 4.10 pm by CNN, although the fires seem
to have started hours earlier, evidently before noon. The fires were
detected on a number of floors, and the building collapsed at 5.20 pm.
A high-resolution video of the collapse is available here.
The Federal Emergency Management Agency, FEMA, speculated that office
fires caused the collapse of the building. It, however, acknowledged in
its report in May 2002: "The specifics of the fires in WTC 7 and how
they caused the building to collapse remain unknown at this time. [...]
the best hypothesis has only a low probability of occurrence." Later in
2002, Larry Silverstein, the owner of WTC-7, gave in the America
Rebuilds TV program a famous "pull it" statement that has generally been
interpreted as meaning that the building was professionally demolished.
Did WTC-7 collapse as a result of office fires, or was it demolished
with explosives? The answer can be sought by examining the way in which
the building collapsed.
Collapse Speed
As one can observe from the videos of WTC-7's collapse, shortly
following the destruction of its penthouse structures, the building fell
to the ground in 6.5 seconds. This is a phenomenally short time: a stone
dropped from the top of the building would have reached the ground
(covering a distance of 174 meters) in 5.95 seconds – if there were no
air resistance! However, in principle the distance analyzed should be
that from the top of the building to the top of the debris pile, not to
the ground. As the exact height of the debris pile is not documented, it
is more useful to examine the early stages of the collapse, during which
the debris pile does not need to be taken into account.
According to the video analysis presented in the 9-11 Eyewitness
documentary, starting from the state of rest, WTC-7 fell 100 meters in
4.5 seconds. This results in an acceleration of 9.8 m/s2, corresponding
to a free fall.
To verify this, I examined the fall of a corner of the building in one
collapse video using Blaze Media Pro video editing software. The corner
fell 56 meters (=the distance between the Start and End lines in the
picture below) in 3.47 seconds. This results in an acceleration of 9.3
m/s2, which corresponds to a very low resistance factor of the
structural supports: only 5 percent of the force of gravity of the
building's falling upper section.
I also measured an acceleration of 8.5 m/s2 for the middle part of the
wide facade in the picture, which means that the force of resistance of
the structural supports was 13 percent of the force of gravity of the
falling upper section (see the calculation in more detail here).
My measurements therefore support the conclusion presented in 9-11
Eyewitness that the skyscraper fell virtually unimpeded. The lack of
structural resistance seems to be explainable only by the destruction of
the structural supports through the use of explosives.
WTC-7 fell on average 7 floors per second (47 / 6.5). One second after
the onset of the collapse, the speed of descent was almost 10
meters/second; after two seconds, almost 20 meters/second; and at the
end, about 60 meters/second (over 200 kilometers/hour).
Heikki Kurttila, a Finnish Doctor of Engineering and accident
researcher, has made detailed calculations about the collapse speed of
WTC-7. In his article Kurttila concludes that the short collapse time
and low structural resistance "strongly suggest controlled demolition".
Structural Features of the Collapse
A striking feature in the collapse of WTC-7 is symmetry. The collapse
progressed evenly throughout the building, and the debris piled up
almost entirely within the foundations of the building.
The symmetry of WTC-7's collapse means that all of its steel supports –
25 central and 58 peripheral columns – were destroyed almost
simultaneously. Any asymmetry in the damage to structures would have led
to asymmetrical collapse. By contrast, a fully symmetrical collapse
without controlled use of explosives would not have followed the
principle of least resistance. Local fires could not have weakened all
the central and peripheral support structures in a way that would have
caused all of them to give up at the same moment.
A controlled demolition is also suggested by the drop of the center of
the skyscraper moments before the surrounding structures started to
fall, as well as by the fact that the outer walls were pulled inwards.
In a controlled demolition the collapse is caused by first destroying
the weight-carrying core of a building, which "pulls" the exterior walls
inwards ("implosion"). Although the lowest floor with fires was
reportedly the sixth floor, the building seems to have undergone a
traditional demolition, beginning from the bottom floor. An emergency
worker who witnessed the collapse of WTC-7 was interviewed on 9/11. He
described hearing what sounded like a "clap of thunder", followed by
what looked like "a shockwave ripping through the building", with
windows busting out, and "about a second later the bottom floor caved
out and the [rest of] the building followed after that".
At least one high-resolution video of the collapse of WTC-7 clearly
shows one more characteristic of controlled demolition: streamers of
dust emerging out of the building.
A Dutch demolition expert Danny Jowenko, who owns a demolition company
and has been in the business for 27 years, concluded in September 2006
that WTC 7 "is controlled demolition. [...] A team of experts did this.
This is professional work, without any doubt." Hugo Bachmann, a Swiss
professor emeritus for structural design and construction, said in
Tages-Anzeiger : "In my opinion WTC7 was with great probability brought
down by controlled demolition done by experts". In addition, Jörg
Schneider, another Swiss Professor emeritus for structural design and
construction, interprets the existing videos as indices that "WTC7 was
with great probability brought down by explosives".
Fire Endurance of Steel
Steel is very fire-resistant material. In tests conducted by Chorus
Construction in several countries, the fire endurance of steel-framed
parking garages was examined by feeding fires with hydrocarbon fuel.
Steel beams and pillars heated to a maximum of 360 degrees Celsius, and
the breaking of steel was not even close. In Cardington fire endurance
tests non-fireproofed steel was subjected to temperatures of up to 1150
degrees Celsius, but no collapse was observed. In the Windsor Building
in Madrid, a 24-hour intensive fire did not collapse the building.
Moreover, the fires in WTC-7 were insignificant compared to fires in
Windsor Building and all other skyscraper fires. Office fires have never
collapsed a single steel-framed highrise to the ground. In the picture
of WTC-7 to the right, the fires are limited to small areas, almost all
windows are intact, and no red heat indicative of temperatures capable
of softening steel is visible. The situation is the same in other
photographs taken of the building in late afternoon. In this video a
fair amount of smoke, but no flames, can be seen. By contrast, WTC-5,
which was badly damaged by the collapse of the North Tower next to it,
burned very powerfully: its floors were covered by a sea of flames and
all windows were broken. However, this building, despite the fact that
it had weaker support structures than WTC-7, did not collapse into a
debris pile, but remained standing.
Characteristics of the Debris
The debris of WTC-7 was extremely hot weeks after the collapse of the
building. Thermal imaging by NASA showed that the top of the debris pile
had a temperature of 730 degrees Celsius five days after the collapse.
Deeper, and immediately after the destruction, temperatures were
probably considerably higher. Residual temperatures like this cannot be
explained by office fires or by an ordinary, gravity-driven collapse.
When the potential energy of a building experiencing an ordinary
gravitational collapse turns into thermal energy, the result is only a
few degrees' average increase in temperature.
According to several reports, molten metal (also suggested by this video
footage) was found under the debris pile of WTC buildings. To melt
structural steel, temperatures exceeding 1500 degrees Celsius are
required. Such temperatures are never achieved in office fires. In
addition to molten metal, partly evaporated steel beams were found in
the debris of WTC-7. As professor Jonathan Barnett pointed out in a New
York Times interview, the fires in the building could not have produced
temperatures capable of evaporating steel. However, the use of
explosives like thermite can produce temperatures (even 3000 degrees
Celsius) that can melt and even evaporate steel.
FEMA's investigators were not allowed to work in the collapse zone
itself. They were allowed to examine the debris of WTC skyscrapers only
in landfill areas used as temporary storage for the steel debris before
its recycling. By May 2005, when FEMA finished its preliminary report
calling for further investigation, all the steel debris had been sold
and shipped into the Far East. Only 156 pieces of steel were chosen for
futher analysis, of which a ridiculous total of 4 were from WTC-7. Even
these four no longer seem to exist.
As WTC-7 was evacuated over six hours before its destruction, there were
no grounds for the rapid removal and recycling of the steel debris.
Quite the contrary: as WTC-7 was one of the three greatest building
collapses in recorded history (the other two being the North and South
Towers), the debris of the building should have been meticulously
examined. Many individuals and publications, such as the Fire
Engineering Magazine, protested strongly against the rapid destruction
of the evidence.
Final Words
Was WTC-7 destroyed as a result of controlled demolition? Everyone can
draw their own conclusions from the way in which the building was
destroyed and the temperatures produced in the destruction.
If and when the building was demolished, it must have been wired with
explosives before September 11th. An operation of that magnitude could
not have been accomplished during a couple of chaotic hours. This is why
the official hypotheses have not touched on the most obvious explanation
for the collapse of the skyscraper. It is revealing that the 9/11
Commission, which published its report in 2004, does not mention in a
single sentence the destruction of the third skyscraper resulting from
the terrorist attack in New York.
FEMA's work has been continued by the National Institute of Standards
and Technology, which has again postponed its report on WTC-7, this time
until 2007. NIST is now saying that it is also investigating the
hypothesis that explosions initiated the collapse. Interviewed in the
March 2006 issue of New York Magazine, Dr S. Shyam Sunder, NIST lead
investigator, summed up the present state of the investigation:
NIST did have "some preliminary hypotheses" on 7 WTC, Dr. Sunder said.
"We are studying the horizontal movement east to west, internal to the
structure, on the fifth to seventh floors." Then Dr. Sunder paused. "But
truthfully, I don't really know. We've had trouble getting a handle on
Building No. 7."
--
http://911research.wtc7.net http://www.st911.org
Here's what happens to steel framed buildings exposed
to raging infernos for hours on end.
http://davesweb.cnchost.com/nwsltr69c.html
On 9-11-01, WTC7, a 47 story steel framed building, which
had only small, random fires, dropped in perfect symmetry
at near free fall speed as in a perfectly executed controlled
demolition.
http://911research.wtc7.net/talks/wtc/videos.html 
Re: The Achilles heel of John "Whiny Bitch"Williams! 
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