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Originally posted by HowardRoark
Dude, the first article was dated January 4, 2002.
The second is from the same time frame. It asks you to send e-mail to “FEMA Director: Joe M. Allbaugh”
He hasn’t been the head of FEMA since March 2003.
Originally posted by HowardRoark
The articles are out of date. NIST has conducted the investigations that those articles were calling for.
Originally posted by HowardRoark
Dude, the first article was dated January 4, 2002.
Originally posted by Griff
Originally posted by HowardRoark
Dude, the first article was dated January 4, 2002.
So, even back then the firemen knew something was wrong with the way the buildings collapsed.
The frequency of published and unpublished reports raising questions about the steel fireproofing and other fire protection elements in the buildings, as well as their design and construction, is on the rise.
Beware the truss! Frank Brannigan has been admonishing us for years about this topic. It has been reported that the World Trade Center floors were supported by lightweight steel trusses, some in excess of 50 feet long. Need we say more?
* Modern sprayed-on steel "fireproofing" did not perform well at the World Trade Center. Haven't we always been leery about these materials? Why do many firefighters say that they would rather fight a high-rise fire in an old building than in a modern one? Isn't it because of the level of fire resistance provided? How much confidence do we have in the ASTM E-119 fire resistance test, whose test criteria were developed in the 1920s? ASTM E-119 is an antiquated test whose criteria for fire resistance do not replicate today's fires.
Originally posted by HowardRoark
The articles are out of date. NIST has conducted the investigations that those articles were calling for.
Vertical shafts surrounding stairs, mechanical shafts (carrying supply and return air), elevator hoistways, and utility shafts were all contained within the building core of the WTC towers, and were enclosed by gypsum planking similar to fire separations commonly used today in single-family attached housing. These gypsum planks were 2 in. thick and 2 ft wide, reportedly with metal tongue and groove channels attached to the long sides. These were likely two 1 in. panels held together by the metal channels. Their length in WTC 1 and WTC 2 is unknown, but similar panels today are available in 8 to 14 foot lengths. The planks were placed into metal H-channels at the top and bottom and secured by drywall screws.
Originally posted by HowardRoark
Vertical shafts surrounding stairs, mechanical shafts (carrying supply and return air), elevator hoistways, and utility shafts were all contained within the building core of the WTC towers, and were enclosed by gypsum planking similar to fire separations commonly used today in single-family attached housing. These gypsum planks were 2 in. thick and 2 ft wide, reportedly with metal tongue and groove channels attached to the long sides. These were likely two 1 in. panels held together by the metal channels. Their length in WTC 1 and WTC 2 is unknown, but similar panels today are available in 8 to 14 foot lengths. The planks were placed into metal H-channels at the top and bottom and secured by drywall screws.
wtc.nist.gov...
Originally posted by Griff
But, as you see gypsum is used as a firebarrier. And even at the suppossed temperatures that were in the towers, they still would have remained firebarriers.
Originally posted by Griff
Also, what's with all the "I don't knows" in that statement? Either NIST has the construction documents or they don't. How could they do a thorough investigation if they don't? Also how can we trust anything in their report if they don't even have an answer as to how long the gypsum panels were?
[edit on 18-4-2006 by Griff]
Originally posted by HowardRoark
Not if you have an airplane crashing into it.
If it remained a fire barrier, then how come the people above the impact zones were trapped?
They have the design criteria and similar documents related to the structural design, but, those are the types of details that were probably lost with the “as-builts” when the buildings came down.
Besides, you are missing an important point here.
These were not the only buildings built using similar materials. Granted, they are not exactly the same as the WTC, but it is still a cause for concern.
Originally posted by esdad71
Many who had reached the top floors could not be recalled after the NYPD helicopter pilots observed the shifting of the upper floors of the WTC just prior to the collpase. The radios did not work. This was something that if you work for FDNY n high rises you will know. They have repeaters for the signal, but they do not always work, and on 9/11 they did not work properly for the firefighters and it caused alot of confusion.
The FDNY is also a very proud bunch, and I equate this to Marines that come home and complain about killing. Those heroes knew when they went that day into that building that they man not come out, and they went in anyways. That is a true hero.
Going back to my research about the discrepency of the drawings that NIST has put out (how they show the trusses at a different scale as the columns as to make the trusses look alot smaller and weaker than they were compared to the columns)
Originally posted by Griff
The Port Authority, I can assure you still has "as-built' drawings. Actually, the "as-builts" become the main drawings after a building has been built. Or are you saying that there was only one copy of the "as-builts" and were destroyed in the buildings?
Originally posted by HowardRoark
How often do you see a note to use 4’ x 8’ sheets of plywood or drywall in a drawing? You don’t. The plans will show a drywall enclosure around the shaft with a specific thickness. Sometimes the spec will list the acceptable products to use other times it will just list the performance criteria for the product. The means and methods of building that enclosure are generally up to the contractor.
Originally posted by Skibum
Can you please post a link to what you are talking about?
In my experience the trusses are generally much smaller and weaker than the columns.