It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Originally posted by nick7261
But you also must realize that a CD theory raises many of the same questions. If there was a CD, what caused the collapse from the top down? And if there were beams cut out from beneath the top floors, what was providing and resistance or force to cause the top floors to disintegrate on the way down? If there were CDs in the base of the towers, they would have fallen from the bottom like WTC7.
Originally posted by jprophet420the third statement has not one single shred of evidence to support that it was not a controlled demolition.
Originally posted by LeftBehind
That's what I was saying. But, your right in that they weren't pyroclastic flows in the definition sense of the word.
Then what sense whould we use? I am truly confused by this. Should we call everything that looks like a cloud a pyroclastic flow?
I don't think so. Pyroclastic flows are only produced by volcanoes.
Gravity Current
In fluid dynamics, a gravity current is a primarily horizontal flow in a gravitational field that is driven by a density difference. Typically, the density difference is small enough for the Boussinesq approximation to be valid.
Gravity currents are typically of very low aspect ratio (that is, height over typical horizontal lengthscale). The pressure distribution is thus approximately hydrostatic, apart from near the leading edge (this may be seen using dimensional analysis). Thus gravity currents may be simulated by the shallow water equations, with special dispensation for the leading edge which behaves as a discontinuity.
Originally posted by apex
Now, I don't know about you, but if you went up to the average person on the street, and said that the WTC demolition clouds looked like a gravity current, they'd say "What?", whereas if you said they resembled a Pyroclastic flow, they would agree.
But yes, it wasn't a true Pyroclastic flow.
FACT: if building 7 collapsed from the damage you mentioned, it would be the first time in recorded history that something like that happened, let alone replicated a CD to a T.
Originally posted by scrapple
So unless a structural engineer pipes in I am going to conclude the falling tops of the towers can use their set amount of energy to either break mechanical bonds holding up the floors, or rubberize the internal steel core tower, or blitz the concrete floors into dust. I simply doubt the system's un-aided capacity can accomplish all three.
Originally posted by LeftBehind
No. It wasn't a pyroclastic flow period. There were no volcanoes involved.
I sincerely doubt the average person would know what either of those terms mean, so I don't see the point in calling gravity flows pyroclastic flows. While a pyroclastic flow is also a gravity flow, they are not interchangeable terms.
Call it a gravity flow if you wish, but please stop saying that the dust cloud is proof of a volcanic eruption.
Originally posted by snoopy
So in other words you think the building should just slowly collapse. It simply doesn't work that way.
If you were to take your chair leg and slowly hack away at it, is it just going to slowly fall, or at some point if the chair going to just fall over? With the fire it weakens the steal which reduces it's strenth. There is a point at which the weight above is great enough to overcome to strength of the steel. At which point the supports give way. They don't just slowly fold down. It's basic physics.
The floor below can in no way withstand the force of an entire floor in momentum (for example, hold a 40lb weight. Then try catching a 40lb weight dropped form 12 feet above). Then each floor below has to take on the weight f the building above adding an additional floor worth of weight and momentum with each floor. This is called a progressive collapse.
I know everyone means well, but it's kinda silly seeing a whole bunch of us with no expertise what so ever trying to convince ourselves that we are structural engineers. Just because YOU don't understand how collapses work does not prove a conspiracy. it only proves you are not a structural engineer.
And of course all this has been well documented by hundreds of engineers and scientists and tested. As well as viewable by every structral engineer in the world. So again, not understanding the engineering does not make the engineering wrong.
Originally posted by nick7261
If the fires weren't hot in the towers then why were dozens of people leaping to their deaths from the buildings? Were they just suicidal to begin with, or did they too misjudge the intensity of the fires in the WTCs?
Originally posted by nick7261
Really, for someone who claims to be "open-minded" you're really struggling with the concept that the woman standing in the "big hole" was obviously standing on the opposite side of the building from the fires.
Originally posted by snoopy
And what I am saying is that he isn't.
Originally posted by snoopy
And by trolls you mean anyone who disagrees with you. Nice.
Gosh yeah I am so out there for being skeptical of a web site that allows anyone to say they are an engineer or an architect. That's just a center of honesty there in that web site. What a troll I am for pointing out a fraudulent web site.
So hopefully Griff will clear things up for us. But one thing he can't clear up is that the web site is a fraud.
But hey, I could tell you I'm a civil engineer too. Am I now somehow credible? Of course not, because I am not telling you there's a conspiracy. If any structural engineer came on here and didn't tell you there was a conspiracy, you would call them a troll.
Originally posted by Griff
No, I'm telling you that a steel column will not just buckle all at one in fire
Originally posted by LeftBehind
Then why would they put such a statement on the front page if they don't even provide one source for it? Why not just stick to the facts and leave the rhetoric behind?
You, see that's my main problem with what they are presenting. If they want to be taken serious as engineers, then stick to the facts.
Instead they claim that literally tons of steel were not only present in the basement of 7, but also in the basements of both towers.
Claims that are dubious at best, yet we are somehow expected to take them seriously with stuff like that on the front page, merely because they claim to be engineers. It's preposterous.
I agree, why post the rhetoric and the strangely worded sentences. Just say a thermate/thermite cutting charge, not a cutting charge like thermite/thermate, or just say cutting charge.
Have you even looked at the site?
It says thermate four times on the right side of the main page!
And what is thermate you ask?
Is is basically a supercharged thermite reaction, so thermite/thermate are practically interchangable.
You would be wrong. Since it is primarily thermite, it would end up with primarily the same end product, which is mostly aluminum oxide.
A compound with 68% thermite, and 2% sulfur, would produce an end product that is mostly aluminum oxide and molten iron. The sulfur content is almost negligble as a "chemical signature."
Sorry. Read the above link. Thermate's main ingredient is thermite.
I don't think so. Pyroclastic flows are only produced by volcanoes.
Ultimately, they need to improve their sources and drop the rhetoric or they will end up a joke like those scholars for truth and justice that are advocating energy beams.
Note: I purposefully ignored the off topic comments and personal attacks. I apologize for the Mr. Engineer comment, it was out of line. Let's try and keep this discussion to their stated beliefs on the site, and the site in general.
Originally posted by Griff
No, I'm telling you that a steel column will not just buckle all at one in fire. It will bend a deflect more slowly than freefall. Try it once.
Originally posted by nick7261
If the fires weren't hot in the towers then why were dozens of people leaping to their deaths from the buildings? Were they just suicidal to begin with, or did they too misjudge the intensity of the fires in the WTCs?
Originally posted by LeftBehind
While a pyroclastic flow is also a gravity flow, they are not interchangeable terms.
Secondly, what would it being a pyroclastic flow mean? It certainly wouldn't point to explosives, as no controlled demolition has ever produced a pyroclastic flow. Why are they trying to make people beleive that volcanoes and explosives are somehow interrelated?
Something like what? If you are talking about a building collapsing from fire, you would be wrong, that has happened many times in recorded history.
If it really replicated a CD to a T, then we wouldn't be having this discussion as there would be no disagreement.
In fact there are many things not consistent with a CD in 7's collapse, it's just that most conspiracy sites choose to ignore them.
CD's do not drop the center of a building several seconds before dropping the rest of the building.
CD's always have very loud and very obvious explosive charges detonating, something completely lacking from 7.
So really it does not replicate a CD "to a T."
Originally posted by selfless
Originally posted by Griff
No, I'm telling you that a steel column will not just buckle all at one in fire
Correct me if I'm wrong but, Explosives can produce that result right?...
[edit on 1-6-2007 by selfless]
Originally posted by nick7261
Originally posted by Griff
No, I'm telling you that a steel column will not just buckle all at one in fire. It will bend a deflect more slowly than freefall. Try it once.
For the record, the towers did not fall at "free fall" speed.
Look at this photo. The debris that was ejected at the beginning of the collapse has cleary fallen further than the collapse itself has progressed.
Originally posted by selfless
Suffocation from the smoke most likely, that's what usually happens when there is smoke in a building but doesn't mean there are extreme fires in the building to have smoke.
Now to show you what i mean here is a comparison of the WTC fire and the Madrid fire.
Here is the tiny little fire from the WTC.
And so the tiny fire took down the WTC in 1 hour?
And so the Madrid fire lasted for 24 hours and didn't take the building down.
Originally posted by snoopy
And what I am saying is that he isn't.
If he was, he would not be asking questions the way he is asking them.
But I guess since he is listed as a civil engineer on a web site that has no verification process at all, it must be true.
You're telling me that a civil engineer is suggesting that a it's odd that a failed support on a building could cause a sudden collapse instead of slowly falling? I mean that alone should be a red light for you.