I'm somewhat weary of this. Anyone who has seriously studied WTC 7 has seen all these videos many times already.
First the topic title - MASSIVE fires. The fires don't get bigger by using capitals. Relative to many high rise fires they were both small and of
short duration and were limited to the 11th and 12th floors.
Second - what difference does the size of the fires make? Big fires don't cause steel high rises to implode any more than small ones.
A basic knowledge of physics, construction engineering and the history of steel framed skyscrapers tells us they can be severely damaged by fire; that
a fire burning hot and long enough can cause partial collapses (see Windsor Tower). It's not clear how much damage a fire could do to the central
support structure of one of these towers if it was allowed to burn indefinitely. I assume there would be insufficient heat and fuel to have much
effect upon it. There is no example of a high rise being gradually raised to the ground in this way.
More relevantly, we have no historical precedent (unless you count WTC 1, 2 or 7) nor any known physical mechanism for a fire (however severe) causing
a high rise to implode (i.e. collapse precipitately and globally).
Compare and contrast:
47 floor WTC 7
Fire on Sept 11, 2001
Duration 6 hours
after collapse
38 floor Meridian Plaza, Philadelphia
Fire on Feb 23, 1991
Duration 19 hours
Was later demolished floor by floor with explosives.
56 floor Caracas Tower, Caracus
Fire on Oct 15, 2004
Duration over 17 hours
Sprinklers and standpipes reportedly did not function, due to poor maintenance. The intensity of the fire prevented firefighters from reaching the
tower's upper floors. No floor beams collapsed.
Engineers who inspected the building's structure when the fire was out reported that it was "very solid."
32 floor Windsor Tower, Madrid
Fire on Feb 12, 2005
Duration almost 24 hours
This is what remained. The steel core did not disintegrate, but had to be disassembled column by column.
47 floor Al Salam Tecom Tower, Dubai
Fire on May 14, 2008 (tower was under construction)
Duration almost four hours
Construction continues on the tower.
[edit on 24-6-2008 by EvilAxis]