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As to the twin towers - because they came down in a manner indicating precise timing, and, because of the actual presence of active thermitic material in the dust, I think it's safe to say that an explosive, rather than a DEW phenomenon, was involved.
Originally posted by Rubicant13
reply to post by Drunkenparrot
When have you ever heard of a building in the vicinity of a another large building falling down from the impact of a building adjacent to it?
Originally posted by Rubicant13
And WWTC 7 also had that same iron reinforced steel as the Twin Towers. So what you are saying that you believe the force of the towers falling caused another reinforced steel I-beam building to fall down?
Originally posted by Rubicant13
I can't buy that whatsoever. I have never heard of such a thing happening.
Originally posted by Rubicant13
And WTC 7 wasn't a building that was falling apart, either. It was in pretty solid shape.
Originally posted by Rubicant13
So you are saying that tower 1 and tower 2 had a tubed steel A36 structural truss assembly? Every report I have found mentions an iron reinforced steel I-beam set up for both towers. I also know that A36 is considered the "generic " form of steel in the profession I work. It has low high temperature heat resistance and has a lower melt temperature than iron reinforced steel - tubed steel has a higher weight pressure tolerance than supports made.of A36 solid truss steel though, I will say that Your link is to a pictures of a tube assembly set up, but are not citing what source you got them from. Do you have other links sourcing them to the World Trade Centers?
Originally posted by Rubicant13
So you are saying that tower 1 and tower 2 had a tubed steel A36 structural truss assembly? Every report I have found mentions an iron reinforced steel I-beam set up for both towers. I also know that A36 is considered the "generic " form of steel in the profession I work. It has low high temperature heat resistance and has a lower melt temperature than iron reinforced steel - tubed steel has a higher weight pressure tolerance than supports made.of A36 solid truss steel though, I will say that Your link is to a pictures of a tube assembly set up, but are not citing what source you got them from. Do you have other links sourcing them to the World Trade Centers?
Originally posted by samkent
reply to post by NewAgeMan
As to the twin towers - because they came down in a manner indicating precise timing, and, because of the actual presence of active thermitic material in the dust, I think it's safe to say that an explosive, rather than a DEW phenomenon, was involved.
Pure nonsense.
Originally posted by NewAgeMan
Explosions?
Originally posted by NewAgeMan
reply to post by maxella1
Here's a couple more dealing with the first hand accounts.
Originally posted by NewAgeMan
Originally posted by maxella1
What would they (rescue workers at Ground Zero) find in the wreckage if bombs were used Dave?
Active thermitic material, and high temperatures, maybe..?
Active Thermitic Material Discovered in Dust from the 9/11 World Trade Center Catastrophe
from www.benthamscience.com...
Also worthy of evaluation
The Journal of 9/11 Studies
Originally posted by Rubicant13
Ok. You mentioned that A36 carbon steel was used in a tube pipe type fashion for the trusses of the World Trade center buildings. A36 carbon steel is a high grade reinforced version of normal A36 steel (I have worked with both) and Carbon A36 has a melt temperature (depending on the density of carbon) between 2600 degrees F and 2800 degrees F. I have seen the A36 Carbon steel I have been around melt at 2750 degrees F. No building designer in their right mind would use regular A36 steel, which is a mild steel, with a lower melt temperature and low tensil strength at lower temperatures; such as a jet fuel fire for instance. Below is a link describing regular A36 steel:
www.ehow.com...edit on 17-11-2012 by Rubicant13 because: (no reason given)
Originally posted by NewAgeMan
Originally posted by Rubicant13
So you are saying that tower 1 and tower 2 had a tubed steel A36 structural truss assembly? Every report I have found mentions an iron reinforced steel I-beam set up for both towers. I also know that A36 is considered the "generic " form of steel in the profession I work. It has low high temperature heat resistance and has a lower melt temperature than iron reinforced steel - tubed steel has a higher weight pressure tolerance than supports made.of A36 solid truss steel though, I will say that Your link is to a pictures of a tube assembly set up, but are not citing what source you got them from. Do you have other links sourcing them to the World Trade Centers?
I think you're correct.
Originally posted by Drunkenparrot
Originally posted by Rubicant13
Ok. You mentioned that A36 carbon steel was used in a tube pipe type fashion for the trusses of the World Trade center buildings. A36 carbon steel is a high grade reinforced version of normal A36 steel (I have worked with both) and Carbon A36 has a melt temperature (depending on the density of carbon) between 2600 degrees F and 2800 degrees F. I have seen the A36 Carbon steel I have been around melt at 2750 degrees F. No building designer in their right mind would use regular A36 steel, which is a mild steel, with a lower melt temperature and low tensil strength at lower temperatures; such as a jet fuel fire for instance. Below is a link describing regular A36 steel:
www.ehow.com...edit on 17-11-2012 by Rubicant13 because: (no reason given)
The documents I have posted are the original Laclede Steel Company engineering specifications and architectural details that were used for the construction of the WTC floor truss system.
At the risk of being redundant, the bottom of the page where it says material... what does it say?
Feel free to share your metallurgical knowledge but A-36 was the material used.
Read section 5-1 on page 129 of the NIST NCSTAR link I posted above, these were stamped by the New York Port Authority and met or exceeded all safety criteria at the time.
Originally posted by Rubicant13
Well. I must say that I cannot argue the point that they used A36 regular grade steel. But, this is used in the trusses. Or building roof supports. Trusses are not used in any other floor of a skyscraper other than the roof, or more in detail, the weight support for the roof. What was the grade of steel chosen as the supports for all the other floors?edit on 18-11-2012 by Rubicant13 because: (no reason given)
There are two basic types of truss:
The pitched truss, or common truss, is characterized by its triangular shape. It is most often used for roof construction. Some common trusses are named according to their web configuration. The chord size and web configuration are determined by span, load and spacing.
The parallel chord truss, or flat truss, gets its name from its parallel top and bottom chords. It is often used for floor construction.
Originally posted by Drunkenparrot
Originally posted by Rubicant13
Well. I must say that I cannot argue the point that they used A36 regular grade steel. But, this is used in the trusses. Or building roof supports. Trusses are not used in any other floor of a skyscraper other than the roof, or more in detail, the weight support for the roof. What was the grade of steel chosen as the supports for all the other floors?edit on 18-11-2012 by Rubicant13 because: (no reason given)
What we have been discussing is the floor support system.
The term "truss" actually has a much broader meaning than the pitched assembly of chords and webbing that carries the weight of a roof.
If you don't mind using Wikipedia for a source...
There are two basic types of truss:
The pitched truss, or common truss, is characterized by its triangular shape. It is most often used for roof construction. Some common trusses are named according to their web configuration. The chord size and web configuration are determined by span, load and spacing.
The parallel chord truss, or flat truss, gets its name from its parallel top and bottom chords. It is often used for floor construction.
Truss
This is a typical floor section from WTC from the NIST report...
This is the roof structure, or hat truss of the towers...
Originally posted by NewAgeMan
As to the twin towers - because they came down in a manner indicating precise timing, and, because of the actual presence of active thermitic material in the dust, I think it's safe to say that an explosive, rather than a DEW phenomenon, was involved.