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9/11/01
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<blockquote data-quote="Jones" data-source="post: 4194512" data-attributes="member: 4805"><p><em>After 7 hours of uncontrolled fires, a steel girder on Floor 13 lost its connection to one of the 81 columns supporting the building. Floor 13 collapsed, beginning a cascade of floor failures to Floor 5. Column 79, no longer supported by a girder, buckled, triggering a rapid succession of structural failures that moved from east to west. All 23 central columns, followed by the exterior columns, failed in what's known as a "progressive collapse"--that is, local damage that spreads from one structural element to another, eventually resulting in the collapse of the entire structure.</em></p><p></p><p><a href="https://www.popularmechanics.com/technology/design/a3524/4278874/" target="_blank"><span style="font-size: 22px"><strong>World Trade Center 7 Report Puts 9/11 Conspiracy Theory to Rest</strong></span></a></p></blockquote><p></p>
[QUOTE="Jones, post: 4194512, member: 4805"] [I]After 7 hours of uncontrolled fires, a steel girder on Floor 13 lost its connection to one of the 81 columns supporting the building. Floor 13 collapsed, beginning a cascade of floor failures to Floor 5. Column 79, no longer supported by a girder, buckled, triggering a rapid succession of structural failures that moved from east to west. All 23 central columns, followed by the exterior columns, failed in what's known as a "progressive collapse"--that is, local damage that spreads from one structural element to another, eventually resulting in the collapse of the entire structure.[/I] [URL='https://www.popularmechanics.com/technology/design/a3524/4278874/'][SIZE=6][B]World Trade Center 7 Report Puts 9/11 Conspiracy Theory to Rest[/B][/SIZE][/URL] [/QUOTE]
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