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<blockquote data-quote="Jones" data-source="post: 4194492" data-attributes="member: 4805">Jet fuel burns at 800° to 1500°friend, not hot enough to melt steel (2750°friend). However, experts agree that for the towers to collapse, their steel frames didn&#039;t need to melt, they just had to lose some of their structural strength—and that required exposure to much less heat. &quot;I have never seen melted steel in a building fire,&quot; says retired New York deputy fire chief Vincent Dunn, author of The Collapse Of Burning Buildings: A Guide To Fireground Safety. &quot;But I&#039;ve seen a lot of twisted, warped, bent and sagging steel. What happens is that the steel tries to expand at both ends, but when it can no longer expand, it sags and the surrounding concrete cracks.&quot;&quot;Steel loses about 50 percent of its strength at 1100°friend,&quot; notes senior engineer Farid Alfawak-hiri of the American Institute of Steel Construction. &quot;And at 1800° it is probably at less than 10 percent.&quot; NIST also believes that a great deal of the spray-on fireproofing insulation was likely knocked off the steel beams that were in the path of the crashing jets, leaving the metal more vulnerable to the heat.<a href="https://www.popularmechanics.com/military/a6384/debunking-911-myths-world-trade-center/" target="_blank">Debunking the 9/11 Myths: Special Report - The World Trade Center</a></blockquote>

[QUOTE="Jones, post: 4194492, member: 4805"] [I]Jet fuel burns at 800° to 1500°friend, not hot enough to melt steel (2750°friend). However, experts agree that for the towers to collapse, their steel frames didn't need to melt, they just had to lose some of their structural strength—and that required exposure to much less heat. "I have never seen melted steel in a building fire," says retired New York deputy fire chief Vincent Dunn, author of The Collapse Of Burning Buildings: A Guide To Fireground Safety. "But I've seen a lot of twisted, warped, bent and sagging steel. What happens is that the steel tries to expand at both ends, but when it can no longer expand, it sags and the surrounding concrete cracks." "Steel loses about 50 percent of its strength at 1100°friend," notes senior engineer Farid Alfawak-hiri of the American Institute of Steel Construction. "And at 1800° it is probably at less than 10 percent." NIST also believes that a great deal of the spray-on fireproofing insulation was likely knocked off the steel beams that were in the path of the crashing jets, leaving the metal more vulnerable to the heat.[/I] [URL='https://www.popularmechanics.com/military/a6384/debunking-911-myths-world-trade-center/'][SIZE=6][B]Debunking the 9/11 Myths: Special Report - The World Trade Center[/B][/SIZE][/URL] [/QUOTE]

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