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| Re: Building Const. For Fire Service (Was: Some WTC Thoughts) (348094) | |||
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Re: Building Const. For Fire Service (Was: Some WTC Thoughts) |
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Posted by JayZeeBMT on Tue Aug 26 16:44:33 2008, in response to Re: Building Const. For Fire Service (Was: Some WTC Thoughts), posted by JournalSquare-K-Car on Tue Aug 26 16:27:46 2008. Temperatures as high as 1350 degrees Fahrenheit were observed in hot spots in the WTC rubble for several days following the collapse. Fires burned at Ground Zero for MONTHS after 9/11. THe jet fuel did not "burn off" after about a "minute". The fireballs from impact dispersed after a minute or so. The (burning) jet fuel was distributed over the entire crash site, along with all the contents of the planes' oxygen canisters (did you forget about those---oxygen vigorously assists combustion), plus any combustibles or accelerants on the floors where the planes hit. Modern offices do contain LOTS of flammable things, everything from cleaning solvents, to tons of paper and wood, natural gas, and carpeting. All these items burned continuously, and, again, long after the collapsers.The confined-space nature of the fires also raised the interior temperatures in both towers. The footage of thick, black smoke venting under pressure is direct evidence of a hot, poorly ventilated fire. The reason you see firefighters breaking windows and ripping the roof open is to ventilate the fire. If this is not done, the fire will ventilate itself--by destroying the structure. Fire Science 101: Heat rises. It then collects at the ceiling. (Brannigan goes on at length to inculcate us as to the dangers of "the floor above" the fire.) This accumulated heat can be expressed as energy, which imparts itself into the trusses and columns by convection and conduction. (Ever try to handle a metal spoon after you've left it in a boiling pot too long?) The damage from the planes is ABSOLUTELY the primary cause of the progressive collapse of both towers. As I stated before, the fires were only the secondary reason the towers fell. I do believe that massive structural damage--no fire--would have eventually brought both towers down, albeit not as quickly as they were when assisted by high-volume conflagration. |
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