Originally posted by HowardRoark
The exterior columns were stainless steel? What are you smoking?
Please spend some time researching this subject before you spam the board again with this nonsense.
Howard: the exterior as this link points out was primarily high grade steel with stainless steel used as trim especially at ground level.
Frankly your arrogance and attitude are spam.
"In order to make each tower capable of withstanding this wind load, the architects selected a lightweight “perimeter tube” design consisting of
244 exterior columns of 36 cm square steel box section on 100 cm centers (see Figure 3). This permitted windows more than one-half meter wide. Inside
this outer tube there was a 27 m × 40 m core, which was designed to support the weight of the tower. It also housed the elevators, the stairwells,
and the mechanical risers and utilities. Web joists 80 cm tall connected the core to the perimeter at each story. Concrete slabs were poured over
these joists to form the floors. In essence, the building is an egg-crate construction that is about 95 percent air, explaining why the rubble after
the collapse was only a few stories high."
"The egg-crate construction made a redundant structure (i.e., if one or two columns were lost, the loads would shift into adjacent columns and the
building would remain standing). Prior to the World Trade Center with its lightweight perimeter tube design, most tall buildings contained huge
columns on 5 m centers and contained massive amounts of masonry carrying some of the structural load. The WTC was primarily a lightweight steel
structure; however, its 244 perimeter columns made it “one of the most redundant and one of the most resilient” skyscrapers.1"
Asbestos in WTC?
"The Trade Tower design – the one referred to as able to resist the crash of a Boeing 707 – specified the use of asbestos insulation on the
supporting columns," said chemistry professor Art Robinson, writing in the September edition of Access to Energy, a monthly science and technology
"This was used on all columns up to the 64th floors. Then, however, in 1971 when the Trade Center Towers were still under construction, New York City
banned this use of asbestos," Robinson, who is also a founder of the Oregon Institute of Science and Medicine, said.
Heat, fire weakens towers' columns
Robinson said the Twin Towers were designed to withstand a raging four-hour fire before its steel beam infrastructure lost enough of its strength and
collapsed. In the intervening time frame, experts believed that tower visitors and workers below the fire level would have ample opportunity to
escape, while those trapped in floors above the fire would be plucked from the roof by helicopter.
However, Tower One collapsed one hour and 40 minutes after it was struck by the first airliner; Tower Two collapsed after 56 minutes of fire.
"Had the towers stood for four hours, an estimated 5,000 people would still be alive, and the buildings would probably still be proudly standing –
with large gashes in their upper floors," Robinson said.
In making his case, Robinson quoted the designer of the asbestos steel-beam coating procedure banned in New York City during the construction of the
The inventor, Herbert Levine, often said during the final phases of WTC construction in the 1970s: "If a fire breaks out above the 64th floor, that
building will fall down."
Robinson pointed out that skyscrapers like the Empire State Building have their steel columns insulated with concrete – which is expensive and
difficult to use.
But, "in the late 1940s, Herbert Levine invented a spray fireproofing composed of asbestos and mineral wool. This invention was instrumental in
allowing the construction of large steel-framed buildings," he said.
Levine's company did not get the contract to insulate the steel beams of the Twin Towers, but he had confidence in the company that did win the
contract until New York banned asbestos and forced the winning contractor to use a "jury-rigged substitute insulation."
Still, other experts believe the collapse of the buildings may have been inevitable, given the circumstances.
"The impact of aircraft of more than 100 tons, at a velocity of several hundred miles per hour, with a fire load of thousands of gallons of kerosene
are not things we contemplate for our clients on a day-to-day basis," said John A. Hill, president of the UK-based Institution of Structural
Engineers. He believes that a willful terrorist can always find a way to demolish any structure.
Others say the heat of the fires generated by the planes took its toll on the steel beams supporting the towers.
"It was the fire that killed the buildings – nothing on earth could survive those temperatures with that amount of fuel burning," said Chris Wise,
another British structural engineer. "The columns would have melted, the floors would have melted, and eventually they would have collapsed one on
top of each other."
Robinson says the jet fuel-laden fires did not generate an unusual amount of heat, instead only generating the amount of heat such fires would
normally produce. The difference, he insists, was that the towers "were not properly insulated, causing them to become weak by the heat of a
"It's notable that Mr. Levine didn't make his comments after the attacks, but instead made them 30 years ago," Robinson told WND. "And he was the
world's expert on insulating steel columns."
Robinson also said he was "certain" that had the columns been insulated with asbestos, the towers would have remained standing "long enough" for
many more people to have escaped.
"Whether that means both buildings would currently still be standing, that's a question," he said. "But we wouldn't be lookin