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<blockquote data-quote="Jones" data-source="post: 3697263" data-attributes="member: 4805"><p>This won't matter to the conspiracy nutjobs because they're nutjobs, but this has all been thoroughly investigated:</p><p></p><p><em>In November 2008, NIST released its final report on the causes of the collapse of 7 World Trade Center.<a href="https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-ncstar1-a-6" target="_blank">[6]</a> This followed NIST's August 21, 2008, draft report which included a period for public comments,<a href="https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-nist-questions-7" target="_blank">[7]</a> and was followed in 2012 by a peer-reviewed summary in the <a href="https://en.wikipedia.org/wiki/Journal_of_Structural_Engineering" target="_blank">Journal of Structural Engineering</a>.<a href="https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-Rbfbr-45" target="_blank">[45]</a> In its investigation, NIST utilized <a href="https://en.wikipedia.org/wiki/ANSYS" target="_blank">ANSYS</a> to model events leading up to collapse initiation and <a href="https://en.wikipedia.org/wiki/LS-DYNA" target="_blank">LS-DYNA</a> models to simulate the global response to the initiating events.<a href="https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-ZsGBe-46" target="_blank">[46]</a>:6–7 NIST determined that diesel fuel did not play an important role, nor did the structural damage from the collapse of the Twin Towers or the transfer elements (trusses, girders, and cantilever overhangs). The lack of water to fight the fire was an important factor. The fires burned out of control during the afternoon, causing floor beams near column 79 to expand and push a key girder off its seat, triggering the floors to fail around column 79 on Floors 8 to 14. With a loss of lateral support across nine floors, column 79 buckled – pulling the east penthouse and nearby columns down with it. With the buckling of these critical columns, the collapse then progressed east-to-west across the core, ultimately overloading the perimeter support, which buckled between Floors 7 and 17, causing the remaining portion of the building above to fall downward as a single unit. The fires, which were fueled by office contents and burned for 7 hours, along with the lack of water, were the key reasons for the collapse.</em></p><p></p><p><a href="https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=861610" target="_blank"><strong>Final Report from NIST</strong></a></p></blockquote><p></p>
[QUOTE="Jones, post: 3697263, member: 4805"] This won't matter to the conspiracy nutjobs because they're nutjobs, but this has all been thoroughly investigated: [I]In November 2008, NIST released its final report on the causes of the collapse of 7 World Trade Center.[URL='https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-ncstar1-a-6'][6][/URL] This followed NIST's August 21, 2008, draft report which included a period for public comments,[URL='https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-nist-questions-7'][7][/URL] and was followed in 2012 by a peer-reviewed summary in the [URL='https://en.wikipedia.org/wiki/Journal_of_Structural_Engineering']Journal of Structural Engineering[/URL].[URL='https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-Rbfbr-45'][45][/URL] In its investigation, NIST utilized [URL='https://en.wikipedia.org/wiki/ANSYS']ANSYS[/URL] to model events leading up to collapse initiation and [URL='https://en.wikipedia.org/wiki/LS-DYNA']LS-DYNA[/URL] models to simulate the global response to the initiating events.[URL='https://en.wikipedia.org/wiki/7_World_Trade_Center#cite_note-ZsGBe-46'][46][/URL]:6–7 NIST determined that diesel fuel did not play an important role, nor did the structural damage from the collapse of the Twin Towers or the transfer elements (trusses, girders, and cantilever overhangs). The lack of water to fight the fire was an important factor. The fires burned out of control during the afternoon, causing floor beams near column 79 to expand and push a key girder off its seat, triggering the floors to fail around column 79 on Floors 8 to 14. With a loss of lateral support across nine floors, column 79 buckled – pulling the east penthouse and nearby columns down with it. With the buckling of these critical columns, the collapse then progressed east-to-west across the core, ultimately overloading the perimeter support, which buckled between Floors 7 and 17, causing the remaining portion of the building above to fall downward as a single unit. The fires, which were fueled by office contents and burned for 7 hours, along with the lack of water, were the key reasons for the collapse.[/I] [URL='https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=861610'][B]Final Report from NIST[/B][/URL] [/QUOTE]
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