با هزینه ای اندکی شما میتونید فایل (The Twin Towers) را تهیه کنید.

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The Twin Towers:

What Really Destroyed Them?

The South Towers top first started to lean, then disintegrated before falling.

Nearly everyone was shocked to see the towers explode into dust in mid-air, but we were not given any time to ask how this happened, as the official explanation was already at hand: the buildings, we were told, collapsed of their own weight.

We were told that no-one had ever anticipated fuel-laden jumbo-jets crashing into the towers, and that the jet fuel burned with the heat of a nuclear power plant and melted the steal columns of the towers cores. Faced with the fact that a jet fuel fire could only reach a fraction of the temperature required to melt the buildings structural steel, the "truss theory" was promoted. Later endorsed by FEMA, it holds that the fires weakened flimsy trusses supporting the floors, causing the floors to fall on one another in a chain-reaction.

This document examines fallacies in the official explanation:

It is not consistent with the laws of physics.

Its collapse scenario doesnt look anything like what happened.

It misrepresents engineering practices and the Twin Towers design.

It was uninformed by any forensic analysis of the physical evidence.

Officials Destroyed the Physical Evidence.

After the disaster, the site was sealed off. People were threatened with arrest for merely taking pictures of Ground Zero. Officials running the "clean up" operation implemented a plan by Controlled Demolition Inc. to recycle the steel: the remains of the towers were shipped by scrap metal vendors to overseas blast furnaces, mainly in India and China. The vast majority of the structural steel was never seen by investigators, FEMAs Building Assessment Performance Team, who were not even allowed access to Ground Zero.

The site of the vast crime that "changed everything", and of the largest and least understood structural failures in history, was not allowed to be examined for clues.

Nor can the public verify details about the buildings design crucial to FEMAs theory, since the blueprints have not been released. The description of the towers structure in their official report leaves over 20% of the steel known to have been used in their construction unaccounted for. By the time FEMAs report was published, Ground Zero had been scrubbed.

The towers easily survived the jet impacts. The impact holes quickly became dark, indicating absence of fires in the the towers cores.

The Towers Were Designed to Survive Large Jet Collisions.

Each tower was designed to survive the impact and fire from a collision by a 707-340 carrying 23,000 gallons of fuel. The similar- sized 767-200s that hit the towers were each carrying about 10,000 gallons of fuel.

Each tower was supported by both a palisade of columns forming its outer wall and a bundle of 47 massive steel columns in its core structure. Like all large engineered structures, the towers were over-engineered to support many times anticipated loads, to survive severe and improbable events, including bombings and fires. The plane crashes severed about 33 of the North Towers and 24 of the South Towers 240 perimeter columns. The South Tower impact trajectory suggests its core structure was barely damaged. Absent severe winds and earthquakes, each tower should have easily survived damage to even a majority of its columns. Each towers crash and fire damage was limited to an asymmetrical minority of columns and a few floors. Yet each tower collapsed symmetrically, and into small pieces.

The Fires Were Not Unusually Severe.

Since jet fuel (kerosene) boils easily and its vapors ignite easily, it burns off rapidly. FEMA admits the fuel must have been used up within "a few minutes". Thereafter the fires burned fuels similar to those in ordinary office fires. The impact holes became dard shortly after each collision, and the smoke darkened over time -- a sign of oxygen-starved fires. After the South Tower had been hit, at least 18 people evacuated from above the impact zone down stairwells passing through it.

There is no evidence that, even at their hottest immediately after the impacts, the fires approached the 700 degrees C required to significantly soften steel. Such temperatures would have caused regions of the building to glow red hot in broad daylight. The oxygen-starved fires likely remained below 400 degrees C, and would be harmless to the steel frame even in the absence of insulation. There is no evidence that the fires ever damaged the core structures. Note that softening of steel by high temperatures is reversible, and that steel is a good conductor of heat. If any structural steel had lost strength in the first minutes of the fires, it would have regained most of it as the fires cooled after consuming the jet fuel.

Fires Dont Cause Skyscrapers to Collapse.

If WTC towers 1 and 2 and WTC 7 collapsed because of the fires it would be the first time in history that a steel-frame skyscraper totally collapsed because of fires or any other cause or combination of causes other than controlled demolition.

47-story WTC 7 sustained no impacts from aircraft or large falling objects, and only small fires were observed within it prior to its precisely vertical "collapse" into a small tidy rubble pile, 7 hours after the North Tower fell.

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