The planes hit, didn't totally collapse the buildings, later explosions from plane fuel and or explosives aboard those planes knocked the buildings on down. The ambulence theory is less likely. Not long after the 1975 debacle even Brooklyn Bethel experienced a bomb from an unknown source. New York and this whole planet has too many nationalist-religious fanatics among people who feel their backs are to the wall then react violently - sad. :(
Planes just a diversion... Ambulances had bombs.
by biblexaminer 34 Replies latest jw friends
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Lindy
My daughter made a good point. The contruction of these tall buildings are made to implode when something like this happens so that they don't tip over. They both came straight down so this might be the reason why. The neigboring trade tower number seven is in risk of tippin over. The force of the trade tower falling and the debris crashing into it at its base weakened its foundation, thus causing the risk of it coming down too.
Lindy
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peacepipe
BE, You MUST watch ARLINGTON ROAD!
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GinnyTosken
Here is a site about how tall buildings implode:
http://www.howstuffworks.com/building-implosion.htm
It includes several video clips of tall building demolitions.
I also found this description of the structural engineering of the WTC towers:
Yamasaki and engineers John Skilling and Les Robertson worked closely, and the relationship between the towers’ design and structure is clear. Faced with the difficulties of building to unprecedented heights, the engineers employed an innovative structural model: a rigid "hollow tube" of closely spaced steel columns with floor trusses extending across to a central core. The columns, finished with a silver-colored aluminum alloy, were 18 3/4" wide and set only 22" apart, making the towers appear from afar to have no windows at all.
Also unique to the engineering design were its core and elevator system. The twin towers were the first supertall buildings designed without any masonry. Worried that the intense air pressure created by the buildings’ high speed elevators might buckle conventional shafts, engineers designed a solution using a drywall system fixed to the reinforced steel core.
[Edited to include the following:]
You might also want to look at this site:
http://www.howstuffworks.com/skyscraper.htm
The two towers in New York's 1,360-foot (415-meter) World Trade Center were built with a sturdy steel truss at their core. This structure was built only to hold the building up under likely circumstances -- it could not sustain the massive blow of an airplane crash.
Ginny
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AlanF
A typically astute examination of video evidence from bibleexaminer:
: It didn't collapse from the top. If you watch the replay, it might look like that to you because the top was on fire and as it collapsed from the bottom, the fire and smoke from the plane explosion carried down as the building sank into it's foundation.
Many eyewitnesses and the videotapes themselves clearly show that the collapse was from the top down.
Oops. There goes another conspiracy theorist.
AlanF
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GinnyTosken
I see that the folks at How Stuff Works have changed the caption under the picture of the twin towers of the World Trade Center. It now reads:
The two towers in New York's World Trade Center stood 1,360-feet (415-meters) tall, with a massive steel truss at their core.
Ginny
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Cassiline
There were reports of second explosions, weather it be from bombs or gas leaks there were reports of exposions.
C
When the pain of being where we are, becomes greater than our fear of letting go...we will risk and heal and grow.
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jukief
On a local Denver news broadcast last night, they interviewed a civil engineer from Denver who worked on the construction of the WTC for seven years. He said the reason the buildings collapsed was because the heat from all that burning jet fuel melted the steel structure. As another poster here commented, the engineer said that steel can't withstand those types of temperatures.
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AMarie
I talked to a good friend of mine who is some type of engineer and he explained it to me this way.
He said the a plane that size carries over 100 thousand pound of fuel, which the plane's fuel tank was totally full when taking off from Boston. After it crashed into the building all of that fuel most likely leaked to the floors below, causing the fires to continually spread and weaken the structure. Just because the buildings were made out of steel and concrete does not mean that fire won't destroy them. Concrete is actually known to violently explode when heated.
I'm no expert on the matter, but it sounded like a pretty good answer to me.
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GinnyTosken
The New York Times online has an article about the buildings called "Believed to Be Safe, the Towers Proved Vulnerable to Jet Fuel Fire" by James Glanz. You may have to register with the site to read it:
http://www.nytimes.com/2001/09/12/nyregion/12CENT.html
Here are some excerpts:
The cause of the twin collapse yesterday of the World Trade Center towers in downtown Manhattan was most likely the intense fire fed by thousands of gallons of jet fuel aboard the two jetliners that crashed into the buildings, experts on skyscraper design said.
The high temperatures, of perhaps 1,000 to 2,000 degrees, probably weakened the steel supports, the experts said, causing the external walls to buckle and allowing the floors above to fall almost straight down. That led to catastrophic failures of the rest of the buildings.
The towers were built to withstand the stresses of hurricane-force winds and to survive the heat of ordinary fires. After the 1993 trade center bombing, one of the engineers who worked on the towers' structural design in the 1960's even claimed that each one had been built to withstand the impact of a fully loaded, fully fueled Boeing 707, then the heaviest aircraft flying.
No engineer could have prepared for what happened yesterday, the experts said. "No structure could have sustained this kind of assault," said Richard M. Kielar, a spokesman for Tishman Realty and Construction Company, the construction manager for the original project.
The enormous heat from the jet fuel fire probably caused the steel trusses holding up concrete-slab floors and vertical steel columns to bend like soft plastic, said Jon Magnusson, chairman and chief executive of Skilling Ward Magnusson Barkshire in Seattle, a structural engineering firm that worked out the original design.
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The structural design of the two towers, fairly common now, was considered innovative in its day. Instead of the heavy internal bracing and heavy exterior masonry of, for example, the Empire State Building, the designers of the trade center towers chose a light glass-and-steel facing threaded by steel columns. Those columns, 61 on each side, gave the towers most of their stiffness and largely held them up, said John Schuring, a professor and chairman of civil engineering at the New Jersey Institute of Technology.
"The major strength of the building is in its skin," Dr. Schuring said.
There was also a cluster of columns in the center, supporting structures like the stairs and elevators, he said. A network of steel trusses ran between the two sets of columns, holding up each concrete floor and providing further strength to the buildings.
A special set of plates on each floor ran among the trusses, serving to dampen stresses on the buildings caused by winds of up to 200 miles per hour, said Jack Cermak, president of Cermak Peterka Peterson in Fort Collins, Colo., the firm that did the wind-tunnel testing for the design of the towers.
Dr. Cermak agreed that the impact of the crash itself probably could not have collapsed the massively reinforced building on its own.
"I presume, without knowing the details, that that collapse was caused by weakening of the structure due to the heat," Dr. Cermak said.
. . .
Ginny