How could all 3 WTC buildings collapse at free-fall speeds?
http://www.plaguepuppy.net/public_html/c...
Look at the liquid molten steel (white/yellow hot) dripping out
of the South Tower before it collapsed (at temperatures hotter
than 1532 C, the melting point of steel)... high temperatures
like this are IMPOSSIBLE to achieve for jet-fuel air fires, and
that is why foundry engineers and materials engineers need to
use special furnaces like Induction, arc or blast furnaces to get
temperatures higher than the melting point of steel... because
fuel-air fires burning in 101.3 kPa or 1 Bar air pressure (the
normal air that we breather) simply cannot get enough oxygen
to get the flames hotter than 300 C. Even in strong winds, the
hottest fires rarely reach over 600 C, not even able to melt
glass or melt aluminium... Watch the videos of the molten
steel dripping out of the South Tower, just before it collapses.
http://video.google.com/videoplay?docid=...
http://truth911.net
Answer:
OK well if you want to play engineer you need to learn not to be bias.
First some aluminum does melt under 600c
A360,A380,383.0,A413.0,390,384 just to name a few.
Next
" Open air burning temperatures: 260-315 °C (500-599 °F) jet fuel""
Does look like you can get it to 300c without wind to me :)
and for 600c
"Maximum burning temperature: 980 °C (1796 °F) jet fuel"
Did you just pick that number because some aluminum melts at a higher temperature? lol
Last other then your bias facts here you have no proof that's steel. If that steels why would it only be jet fuel melting it? Why no magnesium fire or aluminum fire? or any other number of things.It's much easier to looks for the real facts than to make up your own.
they were detroyed by other means contrary to how it was reported to have occured
Only , two WTC Towers collapsed at Newyork USA. Questioner may further clarify about the 3rd tower collapse incidence which is excluded presently.
The reason of collapse and modality of failures of the above two towers ,though occured at an time interval , time,were similar. Probably , impact at centre of percussion
( a point 2/3rd of height ) of these tall steel structures
( cantiliver similar to tuning fork ) imparted a high horizontal acceleration ( much above design siesmic acceleration of the structures) which caused rithmic violent vibration . Resonance at natural frequency, gave rise to high transient stresses and caused collapse of somel structural memebers and fasteners.
Heat of combustion of aviation fuel and associated explosion in confined space , caused disintegration of wall/floors and damaged the impact floor structural integrity. steel members at the impact floor reached plastic state and fail under the upperfloor loads. The impact of upperfloorset falling on the lower set, gave rise to high stresses( about three times more than normal stresses due to weight of upper floorset) . This was another cause of failure of structural members not directly affected by heat.
The tall structures are equivalent to long colmns and to be analysed by column theory.
Once , sufficient number of column/truss beams/tie members failed the structure remained selfsupporting nolonger and collpsed from its own weight.
All above is a possible modality of failure visualised .Exactness remain to be verified by simulation , modelling and other failure analysis technics by competent authority.
Frame by frame calculations have shown it is not free fall speed. And you can clearly see some debris falling faster than the speed of collapse.
89 is not 100, 90 is not 100, and 99 is not 100.
Almost free fall speed is not free fall speed.
Plane is made with aluminum. Steel isn't only metal in that building. Plus all that aluminum from plane.
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