Title: Fire Did Not Cause 3rd Tower’s Collapse on 9/11, New Study Finds Source:
Architects & Engineers for 9/11 Truth URL Source:https://www.ae911truth.org/wtc7?fbc ... L0IDQYyB2d7IvRLn0Qb0pH4Q3b91iA Published:Sep 4, 2019 Author:AE911Truth staff Post Date:2019-09-05 06:15:20 by Deckard Keywords:None Views:11238 Comments:69
On September 11, 2001, at 5:20 PM, the 47-story World Trade Center Building 7 collapsed into its footprint, falling more than 100 feet at the rate of gravity for 2.5 seconds of its seven-second destruction.
Despite calls for the evidence to be preserved, New York City officials had the building's debris removed and destroyed in the ensuing weeks and months, preventing a proper forensic investigation from ever taking place. Seven years later, federal investigators concluded that WTC 7 was the first steel-framed high-rise ever to have collapsed solely as a result of normal office fires.
Today, we at Architects & Engineers for 9/11 Truth are pleased to partner with the University of Alaska Fairbanks (UAF) in releasing the draft report of a four-year computer modeling study of WTC 7’s collapse conducted by researchers in the university's Department of Civil and Environmental Engineering. The UAF WTC 7 report concludes that the collapse of WTC 7 on 9/11 was caused not by fire but rather by the near-simultaneous failure of every column in the building.
"Fires on Floors 7 through 9 and 11 through 13 burned out of control, because the water supply to the automatic sprinkler system had failed. The primary and backup water supply to the sprinkler systems for the lower floors relied on the city's water supply. Those water lines were damaged by the collapse of WTC 1 and 2."
"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."
a steel girder on Floor 13 lost its connection to one of the 81 columns supporting the building
You would actually need a 'controlled fire' in order to cut steel. The fire would have to be highly concentrated, mixed carefully with oxygen under high pressure in order to even make a dent in steel. An acetylene torch (or nowadays, a plasma cutter) cuts steel.
Thermite will also cut or weld steel depending on what you want it to do.
An uncontrolled fire will not touch steel, which just begins to melt at 2500F.
The steel doesn't need to melt, just soften, and it does that around 1,000°F (500°C).
I have yearly chimney fires that get hotter than that (1000-2000F). The flimsy pipe just glows red without any warping (it is scary though!).
Think about that massive beam hidden deep in the structure. You'd have to heat that beam (probably coated in fire retardant?) way beyond cherry to cause any movement. The joint, which is either welded or riveted, would then have to fail. The joint is designed not to fail, especially with mere warping. Multiple inspectors signed off on the joint as it was created.
The problem with heating, cutting or melting steel is that as you heat the surface, the heat is wicked away by the rest of the steel. Those beams in sky scrapers are massive, probably minimum 3/4 inch plate (although I don't have the exact specs). The possibility of getting any uniform heat into that beam by normal building fire is, well, impossible.
That's why I listen when the engineers speak. They know the exact specs, load capacity, deflection under every temperature, wind velocity, etc. You name it, they know it.
