Computer Simulation Disputes 9/11 Conspiracy Theories


This report comes at a good time following recent posts on 9/11 conspiracy theories, with animation of the collision above. Hopefully this puts an end to this nonsense, but past experience has demonstrated that facts rarely have any impact on conspiracy theorists.

A computer simulation of the 2001 World Trade Center attacks supports a federal agency’s findings that the initial impact from the hijacked airplanes stripped away crucial fireproofing material and that the weakened towers collapsed under their own weight.

The two-year Purdue University study, funded in part by the National Science Foundation, was the first to use 3-D animation to provide visual context to the attacks, said Christoph Hoffmann, a professor of computer science and one of the lead researchers on the project.

“One thing it does point out… is the absolute essential nature of fireproofing steel structures,” Hoffmann told The Associated Press. “This is something that wasn’t done originally in the World Trade Center when it was built. It wasn’t code at that time.”

Mete Sozen, a professor of structural engineering and a lead investigator on the simulation, said Purdue researchers hope their work leads to better structural design and building codes to prevent similar collapses.

“In the unfortunate development that we shall have to design structures to survive such events, the methods we have developed and will be developing will be of great use to designers,” Sozen said.

The animation, intended in part to help engineers design safer buildings, begins with a map of lower Manhattan as it appeared on Sept. 11, 2001. The video then shows a plane slicing through several stories of the World Trade Center’s north tower and follows the disintegrating plane through the interior and out the opposite side.

The report concludes that the weight of the aircraft’s fuel, when ignited, produced “a flash flood of flaming liquid” that knocked out a number of structural columns within the building and removed the fireproofing insulation from other support structures, Hoffmann said.

The simulation also found that the airplane’s metal skin peeled away shortly after impact and shows how the titanium jet engine shafts flew through the building like bullets.

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  1. 1
    battlebob says:

    I thought this was old news. Within a year of the attack, there were simulations showing the explosion knocked off the sprayed-on fire-proofing. The gerders melted and the buildings pan-caked.

    Some of the conspiracy nuts point to building seven which was heavily damaged by fire and deliberately brought down in a controlled demolition before it could collapse and do a lot of damage to nearby buildings and people.

  2. 2
    Ron Chusid says:


    Its a new study and simulation which shows what we already knew, so from that persepctive its old news. I’m not even sure I’d have bothered posting this if not for having been under attack here from the conspiracy theorists. This studdy happend to come out shortly after Ginny posted one of their articles as “evidence” of the conspiracy in a comment to an earlier post.

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