" The official theory of the collapse, therefore, is essentially a fire theory, so it cannot be emphasized too much that fire has never caused large steel-frame buildings to collapse---never, whether before 9/11, or after 9/11, or anywhere in the world on 9/11 except allegedly New York City---never.
One might say, of course, that there is a first time for everything, and that a truly extraordinary fire might induce a collapse. Let us examine this idea. What would count as an extraordinary fire? Given the properties of steel, a fire would need to be very hot, very big, and very long-lasting. But the fires in the towers did not have even one of these characteristics, let alone all three.
There have been claims, to be sure, that the fires were very hot. Some television specials claimed that the towers collapsed because the fire was hot enough to melt the steel. For example, an early BBC News special quoted Hyman Brown as saying: “steel melts, and 24,000 gallons of aviation fluid melted the steel.” Another man, presented as a structural engineer, said: “It was the fire that killed the buildings. There’s nothing on earth that could survive those temperatures with that amount of fuel burning. . . . The columns would have melted” (Barter, 2001).[7]
These claims, however, are absurd. Steel does not even begin to melt until it reaches almost 2800° Fahrenheit.[8] And yet open fires fueled by hydrocarbons, such as kerosene---which is what jet fuel is---can at most rise to 1700°F, which is almost 1100 degrees below the melting point of steel.[9] We can, accordingly, dismiss the claim that the towers collapsed because their steel columns melted." - PHD handsomehunk
No way is someone this dumb. Steel elongates at 1200 degrees and causes trusses to fail.( as pointed out already) There are plenty of dead firefighters to contradict "no large steel frame building has ever collasped" theory. This handsomehunk needs beat about the head and shoulders with some IFSTA manuals for a hour or so.
