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Originally posted by bsbray11
So, how complex of a demolition could al Qaeda pull off? In a building complex established by two Rockefellers?
[edit on 7-8-2007 by bsbray11]
Charles Pegelow: As far as the pancake theory, that's not even applicable to steel structures. Actually, I think it seems like, some of the stuff I'm seeing is that NIST is sort of backing away from that theory now.
First of all, it's a fully-welded structure. You may get deflections, and settlement, but you wouldn't get an immediate collapse on a floor unless you took out all the columns at the same time. …
There's been a lot of disinformation going around. One is that these weak bolts fractured and fell apart. Yeah, there was bolts holding both ends of these trusses in, but those are what's called erection bolts: you initially have to hook it together. And then afterwards, they come in, on the seat of the joist, which is most of the time just two angles back to back, you go in there and you run a seal weld around it. So these are welded up. …
So this pancake theory is something that doesn't hold up. It's a phenomenon that doesn't happen in steel structures. Pancake collapses happen mainly in certain types of concrete construction, and this is not all concrete, just certain types. And this is where you put your columns in, and you pour a slab, and around these columns you've got a pocket. And once its cured, by two days, you come in and pour another slab. And then you lift these slabs up, one by one, you see the pockets, the columns sliding in them, and then once you get them up there, then you tie them off to the columns.
And this is where sometimes there's problems. They're not tied off secure enough, or a lot of times these accidents happen at construction and by the time the last one gets there it falls down, but you understand they're not even connected to the columns except by some construction jacks at time. And then of course, the other times they get collapses, they had a lot of these in Mexico during the '70s on apartment buildings during earthquakes, so I don't know, I just have a feeling that their concrete wasn't mixed right, they cheated on as much rebar as they needed, or something like that. But anyway, that's a conventional pancake collapse. It doesn't happen in steel buildings.
Jim Fetzer: And Charles, when it's all said and done, don't you have a stack of floors there on top of one another, which is the reason it's called a "pancake"?
CP: Yeah. Yeah, they just, you're right. They just pancake down. Now, they're all busted up, but they don't turn to dust.
Originally posted by budski
But one thing bothers me - official reports. I'm sure we've all seen/read official reports that can be construed as considerably wide of the mark.
Yes they had the means, and the opportunity, but the motive is where it falls down IMO.
I was also under the impression that al'qaeda didn't perform a demolition
Originally posted by budski
That's a good point, and one that I've read before.
But one thing bothers me - official reports. I'm sure we've all seen/read official reports that can be construed as considerably wide of the mark. The report into the JFK shooting is one that immediately springs to mind - but this (to me at least) suggests incompetence rather than conspiracy.
Originally posted by 11Bravo
So let me put this into perspective for you budski.
You think the JFK report is wrong, but you accept the 911 reports as true.
originally posted by bsbray11
Where I "fall down" is how you really think you know enough about the reality of world politics to be able to even decipher the underlying motives. Someone who stays glued to the TV for their news and information 24/7 would have some major worldview problems to resolve before being able to guess a motive for 9/11 having been an inside job, I'm sure.
Originally posted by budski
Are there any creditable, unbiased, independent reports that are available?
That's quite a statement, but you really have no idea what I do or don't know about the political nature of the world.
Originally posted by bsbray11
That'd be NIST's. Theirs was supposed to be, anyway. FEMA did a preliminary kind of report, NIST did the big one. Those have been the only two groups allowed to view the evidence or the structural documents.
Originally posted by budski
Are there any creditable, unbiased, independent reports that are available?
Originally posted by 2PacSade
In the NIST 2004 " preliminary " report, page L-51, it states;
The working hypothesis, for the collapse of the 47-story WTC 7, if it holds up upon further analysis,
would suggest that it was a classic progressive collapse that included:
• An initial local failure due to fire and/or debris induced structural damage of a critical column, which supported a large span floor area of about 2,000 ft2, at the lower floors (below Floor 14) of the building,
• Vertical progression of the initial local failure up to the east penthouse bringing down the interior structure under the east penthouse, and
• Horizontal progression of the failure across the lower floors (in the region of Floors 5 and 7 that were much thicker and more heavily reinforced than the rest of the floors), triggered by damage due to the vertical failure, resulting in disproportionate collapse of the entire structure.
Emphasis mine, but where has this " classic progressive collapse " ever happened before or since???
I believe the correct answer to this question is in ONLY in a controlled demolition.
The most profound thing I got out of this hypothesis is the fact that if someone WANTED to initiate a total collapse one would only have to perform the following;
A vertical collapse appears to have occurred after interior columns 79, 80, and/or 81 failed.
This vertical progression causes a horizontal progression which in turn causes total collapse. No need to wire the whole building with expolsives!
According to NIST's own hypothesis, it would be this easy. If this is so then wouldn't this answer questions like;
" If this was a controlled demolition then why didn't anybody find DET cord/blasting caps/etc. during the cleanup process?"
You can read the whole report here
And for those of you that state this building didn't fall into it's own footprint;
The debris of WTC 7 was mostly contained within the original footprint of the building. From aerial photos, the debris visible on top of the pile is mostly façade structure. This failure sequence suggests that the interior of the building collapsed before the exterior.
NIST does not agree with you. . .
How can anyone state that it would have been impossible for someone to have performed a CD on this building and not get caught when NIST is directly telling you how easy it could have been done?
2PacSade-
Originally posted by budski
And the evidence and structural documents are not available - so all the threads in this forum are at least somewhat speculative, because all the evidence is not available.
originally posted by: bsbray11
Not really. Most information is already available. NIST isn't even trying to say it was column failure that did it so proving how redundant the buildings were would do little good, either. Really, there's nothing to prove or disprove on "this side", because NIST never did the testing to verify their hypothesis in the first place. It remains a baseless assertion.
9/11 WTC Collapse - Visible Core Columns
www.dailymotion.com...
Failure of Welded Floor Truss Connections from the Exterior Wall during Collapse of the World Trade Center Towers
app.aws.org...
Failure of connections, as a result of overloading, occurred within the heat-affected zone of the base metals
ABSTRACT. As part of the National In- stitute of Standards and Technology World Trade Center Investigation, failure modes of the connections attaching the composite floor system to the exterior wall of WTC 1 and WTC 2 were surveyed. Met- allographic analyses of intact and failed welds of the main load-bearing truss seats complemented the survey to identify the location of metallurgical failure for these connections. Above the aircraft impact floors (94th to 99th in WTC 1 and 77th to 85th in WTC 2), the failure modes were randomly distributed. However, over 90% of floor truss connections at or below the impact floors of both buildings were either bent downward or completely sheared