Big_D
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Can it be? Even more expert opinions!
"... a preliminary examination shows it was the fire with heat exceeding 1,000 degrees Fahrenheit that caused the steel to fail and the floors to drop, pancaking into mounds of debris, he said.
Astaneh-Asl came across another piece of steel with a slice through part of it, "like a knife on butter."
He suspects that the mark was left by the plane's wing. "Steel doesn't fracture like this unless it's hit by something sharp and fast," he said.
And he found a chunk of solder that had been in a toilet...
Much of his work, though, is mundane: Collecting pieces of glass and weighing them, so that a computer model of the building that he is creating to simulate what happened will be as accurate as possible. "
Dr. Abolhassan Astaneh-Asl -Engineering professor from Berkeley University
His credentials MORE than speak for themselves:
CEE Faculty Page - Abolhassan Astaneh-Asl
Display
"...he and others point to the lack of adequate fireproofing as the reason the structural steel became so hot, causing it to give way. Once the floors around the impact area were destroyed, the top of each building fell, collapsing the floors underneath it like a deck of cards.
But before undertaking further exploration of the lack of fireproofing, the basic design of the twin towers is itself of interest. Media reports often describe it as "innovative," "unusual," or a "technological breakthrough." They point out that far from being a solid steel structure, the towers more resembled 110 stories of spider webs surrounding a tree branch."
The Militant - January 7, 2002 -- World Trade Center builders' greed responsible for massive death toll
Dr. Frederick W. Mowrer -Engineering Professor at the university of Maryland
Another expert with EXCELLENT credentials:
Frederick W. Mowrer, Faculty, Department of Fire Protection Engineering, University of Maryland
You might have to read the full article to understand the following quote:
""When that part is wiped out, the structure comes down," Irfanoglu said. "We design structures with some extra capacity to cover some uncertainties, but we never anticipate such heavy demand coming from an aircraft impact. If the columns were distributed, maybe, the fire could not take them out so easily."
Purdue study supports WTC collapse findings - USATODAY.com
Dr. Ayhan Irfanoglu- Engineering professor at Purdue
Amazing credentials: Ayhan Irfanoglu - Purdue University
Purdue simulation of the World Trade center collapse:
[ame=http://www.youtube.com/watch?v=gH02Eh44yUg]YouTube - Scientists simulate jet colliding with World Trade Center[/ame]
-Dr. Ayhan Irfanoglu
His credentials are already mentioned.
"The 110-story twin towers of the World Trade Center, which stood at a height of 1,353 feet, were designed to withstand earthquakes as well as impacts like that of a plane. This was evidenced by the fact that the buildings did not fall over on impact., says Brian Markham, a structural engineer with the Ove Arup & Partners engineering firm."
Why Did the World Trade Center Towers Collapse? - Dahlia Lithwick - Slate Magazine
"... a preliminary examination shows it was the fire with heat exceeding 1,000 degrees Fahrenheit that caused the steel to fail and the floors to drop, pancaking into mounds of debris, he said.
Astaneh-Asl came across another piece of steel with a slice through part of it, "like a knife on butter."
He suspects that the mark was left by the plane's wing. "Steel doesn't fracture like this unless it's hit by something sharp and fast," he said.
And he found a chunk of solder that had been in a toilet...
Much of his work, though, is mundane: Collecting pieces of glass and weighing them, so that a computer model of the building that he is creating to simulate what happened will be as accurate as possible. "
Dr. Abolhassan Astaneh-Asl -Engineering professor from Berkeley University
His credentials MORE than speak for themselves:
CEE Faculty Page - Abolhassan Astaneh-Asl
Display
"...he and others point to the lack of adequate fireproofing as the reason the structural steel became so hot, causing it to give way. Once the floors around the impact area were destroyed, the top of each building fell, collapsing the floors underneath it like a deck of cards.
But before undertaking further exploration of the lack of fireproofing, the basic design of the twin towers is itself of interest. Media reports often describe it as "innovative," "unusual," or a "technological breakthrough." They point out that far from being a solid steel structure, the towers more resembled 110 stories of spider webs surrounding a tree branch."
The Militant - January 7, 2002 -- World Trade Center builders' greed responsible for massive death toll
Dr. Frederick W. Mowrer -Engineering Professor at the university of Maryland
Another expert with EXCELLENT credentials:
Frederick W. Mowrer, Faculty, Department of Fire Protection Engineering, University of Maryland
You might have to read the full article to understand the following quote:
""When that part is wiped out, the structure comes down," Irfanoglu said. "We design structures with some extra capacity to cover some uncertainties, but we never anticipate such heavy demand coming from an aircraft impact. If the columns were distributed, maybe, the fire could not take them out so easily."
Purdue study supports WTC collapse findings - USATODAY.com
Dr. Ayhan Irfanoglu- Engineering professor at Purdue
Amazing credentials: Ayhan Irfanoglu - Purdue University
Purdue simulation of the World Trade center collapse:
[ame=http://www.youtube.com/watch?v=gH02Eh44yUg]YouTube - Scientists simulate jet colliding with World Trade Center[/ame]
-Dr. Ayhan Irfanoglu
His credentials are already mentioned.
"The 110-story twin towers of the World Trade Center, which stood at a height of 1,353 feet, were designed to withstand earthquakes as well as impacts like that of a plane. This was evidenced by the fact that the buildings did not fall over on impact., says Brian Markham, a structural engineer with the Ove Arup & Partners engineering firm."
Why Did the World Trade Center Towers Collapse? - Dahlia Lithwick - Slate Magazine
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