Re: Crollo Torri Gemelle: perché si parla di effetto pancake?

Inviato da  Henry62 il 19/7/2006 14:43:01
Caro Max-Piano,
inforchiamo gli occhiali tutti insieme e vediamo allora cosa dice questa sezione del report Nist, così é chiaro a tutti chi di noi due sta dicendo fesserie e sta insabbiando.
Sei d'accordo che questo é il testo in questione?

6.14.4 EVENTS FOLLOWING COLLAPSE INITIATION

Failure of the south wall in WTC1 and east wall in WTC2 caused the portion of the building above to tilt in the direction of the failed wall. The tilting was accompanied by a downward movement. The story immediately below the stories in which the columns failed was not able to arrest this initial movement as evidenced by videos from several vantage points. The structure below the level of collapse initiation offered minimal resistance to the falling building mass at and above the impact zone. The potential energy released by downward movement of the large building mass far exceeded the capacity of the intact structure below to absorb that through energy of deformation. Since the stories below the level of collapse initiation provided little resistance to the tremendous energy released by the falling building mass, the building section above came down essentially in free fall, as seen in videos. As the stories below sequentially failed, the falling mass increased, further increasing the demand on the floors below, which were unable to arrest the moving mass.
The falling mass of the building compressed the air ahead of it, much like the action of a piston, forcing material, such as smoke and debris, out of the windows as seen in several videos.
NIST found no corroborating evidence for alternative hypotheses suggesting that the WTC towers were brought down by controlled demolition using explosives planted prior to September 11, 2001. NIST also did not find any evidence that missiles were fired at or hit the towers. Instead, photographs and videos from several angles clearly show that the collapse initiated at fire and impact floors and that the collapse progressed from the initiating floors downward, until the dust clouds obscured the view.


Adesso rispondimi ad una semplice domanda, per favore.
Secondo il NIST, non secondo te, il movimento della parte superiore ai piani colpiti é iniziato perché c'è stato l'effetto pancake, o dopo che il blocco superiore si é messo in movimento nei piani inferiori si é verificato il cedimento anche dei floors sottostanti?

Grazie.
Ciao

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