Big fires in WTC7, page 1
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reply posted on 22-6-2007 @ 01:24 PM by CaptainObvious
Just some facts about Madrid:

Yes it burned for 26 hours. But do you know that the initial collapse of this building was in 2 hours and 30 minutes after the start of the fire?? Why didnt the rest of the building collapse? Well, because reinforced concrete was used in the core and under the 17th floor.



The building totaled 32 story's, with 29 floors above ground and three below. A concrete core and concrete frame supported the first 16 floors. Above that was a central support system of concrete columns, supporting concrete floors with steel perimeter columns. An additional feature was the presence of two 'technical floors' - concrete floors designed to give the building more strength. One was just above the ground level and the other at the 17th floor.


www.concretecentre.com...

Some other interesting facts:
The building was subjected to a three year refurbishment program of works when the fire broke out. The major works included the installations of:

Fire protection to the perimeter steel columns using a boarding system
Fire protection to the internal steel beams using a spray protection
A sprinkler system
A new aluminium cladding system

(Fire protection to the steel columns... hmm...pretty interesting)

Why?....well...The fire protection on the existing steelworks below the 17th floor had been completed at the time of fire except for the 9th and 15th floors. When the fire spread below the 17th floor, those protected perimeter columns survived, except for the unprotected columns at the 9th and 15th floors which all buckled in the multiple floor fire.


reply posted on 22-6-2007 @ 02:36 PM by Pootie
I see PLENTY of intact steel in Madrid above 17:





Also notice the WHOLE BUILDING was on fie and the failure of beams at the top did NOT crush the building below?

WTC 1,2 and 7 had:

Fireproofing
Sprinklers...

What is your point other than the concrete?

[edit on 22-6-2007 by Pootie]
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