9/11 Collapse Theory Discussion III

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Pants-of-dog

siamdave wrote:

- if I might - the anti-science nature of everything to do with the OCT prompts me to respond here - it's not a question of what laws of physics or science you have violated, it's getting an idea of what laws of science the official conspiracy theory actually follows. Allow me to demonstrate - it's not challenging:

1. They use the 'legal prosecutorial' method rather than anything that would be called 'scientific' laws or methods of (real) physics. When faced with a new or unusual phenomenon, the scientific method involves gathering **all relevant** factual data, formulating realistic hypotheses that explain the observed phenomenon, testing them, etc. The admitted method used by Bazant and all OCTers following was to postulate a model on very limited, preliminary data, again saying right up front they are NOT going to even consider the most likely hypothesis (based on Occam's razor etc principles - if it looks like X, behaves like X, probably it is X), then selectively gather and interpret 'facts' to fit that solution, very often in the process making wild exaggerations and completely unjustified assumptions to justify their theory, along with failing to consider (or simply lying about) basic facts concerning the WTC towers and highrise construction in general. That more Americans and other people do not understand this does not lend credence to the 'theories', any more than jungle savages thinking a modern firearm is 'magic!' proves magic exists. Major violation of the most basic scientific principles right from the getgo. Things founded on lies and misdirection and deception are highly questionable by definition, and surely have nothing to do with real science and physics.

2. For one quite brazen example, all of these "theories" point to, and heavily rely on, "evidence" indicating that at some times, some localized fires MAY have reached temperatures at which steel can become compromised if the steel itself reaches those temps - and then make the astounding assertion (assumption) and leap that therefore all of the steel in a certain very large area was thus compromised, leading to the instantaneous failure of all of the columns that were not directly breached or damaged by the initial impacts. A wild exaggeration, very blatantly so, something no impartial scientist honestly engaged in trying to figure out what happened that day would ever make, but necessary to justify their pre-conceived model. For example, there is no visual evidence at all that most of the outer columns, visible throughout the period between the plane crash and collapse, ever reached temperatures anywhere near hot enough to compromise them. None - indeed, all visual evidence, of which there is a lot, would indicate that most of these columns stood tall and strong until the collapse was initiated through some as yet undetermined means. To assert that all of these outer columns reached temperatures hot enough to compromise their strength, at the same point in time, and thus all collapsed together, is completely contradictory to both reason and actual observation.
**There is no mention of the inclination of steel to conduct heat away from the source of the heat which would make the attaining of such temperatures in any single spot, let alone in dozens of central and a couple of hundred outer, columns very, very, very difficult in that huge steel matrix,
** there is no mention that there were at least 30 central very large and solid steel columns remaining after the crashes that would have had to reach this high temperature,
** there is no attempt to explain how long steel has to be exposed to what temperatures to start to approach its weakening point,
** there is no attempt to explain how long a length of all of those columns would need to reach some failure point before it buckled or disintegrated,
** etc and etc and etc.
(I'm not even getting into the loss of fireproofing here, so down Rover - if the fires are not hot enough or sustained enough to affect bare steel, which is what the temps all refer to and is no more 'proven' by wild assumptions than Santa Claus, then whether or not the fireproofing was dislodged is just another meaningless red herring - the fireproofing only matters if the purveyors of the theory have demonstrated with some believability that the fires were hot enough for long enough to affect even bare steel in all of those columns, which they have not begun to do.)

The 'progressive collapse' theory completely fails on this point alone, as if the 'initiation' is proven to be impossible, there could hardly be 'progress'. In thinking about the scenario as I describe it above, I don't need to show you where 'the laws of physics' and/or science were not followed - you need to show us where, in any instance, they actually were followed ...

You should provide evidence that Bazant, the NIST, andother studies actaully left out all these things. It would make your case stronger.

The truth is that different engineers have modelled these different things you claim they haven't.

http://web.mit.edu/civenv/wtc/PDFfiles/Chapter%20IV%20Aircraft%20Impact.pdf

 

siamdave wrote:
3. Again, all of these theories begin with some version of this (from Greening): "..We consider the initiating event of a WTC tower collapse to be the failure of crucial steel support structures at the appropriate upper floor level of the building, followed by the free fall of the entire upper block of n floors through a distance hf = one floor height = 3.7 meters..."

Really. Now that is one hell of a "consideration", and the two major things it states as necessary prerequisites for the entire following "theory" stand up to no scienctific reasoning at all. It's very telling that NONE of these people mention any actual numbers of columns, but use words designed to obfuscate - 'many columns' were damaged, 'the remaining' columns could not take the 'overstressing', and etc. The theory would sound a lot different if numbers were used - "The plane crashes breached some 30-60 (depending on building) of the ~250 outer columns, leaving most of them intact and undamaged; as for the inner columns, we can not be sure, but the best estimates indicate that 5-15 of the 47 inner core columns were breached or damaged, leaving a minimum of 30 of the 47 inner columns standing to bear the weight of the building, in a huge steel matrix along with the remaining outer columns and 110 floors of cross-bracing...' - wow, sure leaves a different impression than the one left by the OCT - but if your underlying purpose is to create and encourage belief in a sense of impending doom, quite obviously the use of real numbers would not further your cause, indeed would be quite inimical to it.

But that is just a preamble. Again, let's look at numbers a bit more precise than 'a few were left' - actually, let's say that 35/47 columns remained after the crash, all part of that 6x8 column, 1100-ft tall cross-braced matrix - that's a lot of strong steel - it is an apparently intentional misdirection of the OCT to attempt to give the impression these columns stood alone, rather than as part of a great matrix. Another extremely dishonest thing all of these theories do is attempt to pretend the fact of 'redundancy' does not exist, but of course every steel skyscraper is built with some amount of redundancy, so when one structural element fails, and the load is transferred elsewhere, there is not an automatic 'overload', as these theories attempt to give the impression. If a column is designed to bear 100 pounds, but it's actual load is 50 pounds, then adding 10-20 or even 30-40 more pounds is not 'overloading' it, just bringing it closer to its design load. Why would 'real' scientists, trying to explain the collapse of the twin towers, not talk about this *fact* openly? Obviously, the job of these OCT-selling apologists is not real science at all, but to justify the 'total collapse' rather than get involved with explaining why it should *not* have collapsed - and even acknowledging this redundancy would make their job very, very difficult, and probably, in consideration of everything else they obfuscate or lie about, well nigh impossible. Especially when you start adding in over 200 outer columns, all sharing the weight of the building after the crash damage with the 30+ inner columns, with no demonstrable fire exposure for certain on most of the outside - no reason at all for all of that steel to just 'collapse' en masse. No reason at all. Again - up to you to show me where the 'physics' or 'science' is here in all of this obfuscation to the point of lies - its absence is quite obvious.

Which leads to the 2rd 'consideration' of Greening et al which is completely unjustifiable - "...the free fall of the entire upper block of n floors through a distance hf = one floor height = 3.7 meters...." - I won't bother wasting much time on this - what I have explained before should make it completely obvious that there is simply no possible way, given the conditions and situation of that day, that all 30-40 of those undamaged inner columns, plus over 200 of the outer columns, none of them anywhere near the point of collapse or in any way 'overstressed' or heated to the point of collapse, are going to all just give way at once after small fires burning less than an hour, allowing this totally impossible 'free fall of 3.7M'. No way, and to try to postulate and defend this position is just to completely disengage with reality and science, and it's difficult to justify wasting much time talking with those who try to defend this fantasy, you're really the flat-earthers of the early 21st century, and your completely unscientific and dishonest approach to your arguments in your desperate attempt to defend an untenable position demonstrates that quite clearly (that you appear to be in the majority is not relevant - the original flat earthers were also a majority for quite a long while, and the powers-that-be of the time quite aggressive in defending their 'theory' of the celestial bodies and discouraging any challenges).

4. I shouldn't go around shooting dead horses, but let's try to finish this once and for all, as it gets tedious. Let us assume even for the sake of argument that by some magical intervention all of those ~250 columns just disintegrated all at once, and your upper block actually did fall through 3.7 meters in 'freefall' - is that going to cause the type of total collapse we saw on that day?

Not in a million years, at least outside of Hollywood FX.

**first, you do not have a stack of plates to 'pancake', as your theory tries to make a case for (I know you don't call it pancaking anymore, but that is quite clearly the scenario you try to establish) - you have an 1100-foot tall central core composed of a matrix of 47 cross-braced columns, surrounded by an 1100-foot tube of very strong steel, again cross-braced every few feet. The 110 floors are attached every 10 feet or so all the way up between the central core and outer tube, actually increasing the strength of the overall structure by acting as yet more cross-bracing. If you want to assume that some magical space ray instantly severed a section of this structure, leaving a 10-20 upper-floor section, and this upper section dropped en masse to the lower, this tube-within-a-tube is the basic structure you would be dealing with. So you would not have an upper section dropping onto one floor and overwhelming it, and again and again until it all hit the ground, you would have a 20-story steel tube-within-a-tube dropping onto an 80-story steel tube-within-a-tube, and any imaginings of what that would result in must be based on that reality, not the very misleading 'solid upper block dropping onto a poor old weak single floor' scenario of the OCT. And what is going to happen then? The tubes, the main structural framework, are going to meet - either the upper section drops straight down so the outer and inner columns meet directly, or they are going to be off-center, and some off-center meeting is going to occur, with some number of the upper columns meeting some number of the lower columns - it's going to be a train wreck, but it's not going to be 'global collapse'. (What happens to the cement floors stretching from core to outer columns is pretty irrelevant here, as they will be unable to support much weight and will tend to crumble if any great weight is placed on them. They will, of course, come into play as the two sections reach for their final equilibrium, as cement and steel is obviously not without some strength and resistance, but any individual floor is a small player when considered against those massive inner and outer tubes.)

Think as a scientist, or intelligent layman, rather than someone attempting to justify a collapse theory - if I have a stack of those grey egg trays, lift a few up and drop them - no big spectacular collapse. If I drop a big cement block on that stack, it would smash them up pretty good, of course. But if I dropped that cement block on some other cement blocks - it might chip a couple, but no big global cement block collapse. Likewise the WTC buildings - sure that upper 20 stories of steel and cement looks pretty impressive - but if you drop a 20-story steel and cement structure a few feet onto an 80-story structure of the same stuff, you are NOT going to cause that lower structure to instantly disintegrate - it is made of the same stuff you are dropping on to it, and it is a lot bigger, and it is by god very, very strongly built - it's not going to disintegrate! - it's hard to talk to people who do not understand this rather basic fact of the way the world works, and demand I go and dig up some mathematical equations to demonstrate the obvious because they by golly have constructed some 'equations' to prove the ridiculous, but there it is. We have modern people calling themselves 'economists' doing the same sort of thing, but morning eventually comes to everyone, and the daylight sends the dreams away. You can dick around with distractions all you want, but in the end, you cannot dick around with the way the world works. You can convince the unsophisticated natives that your modern rifle is a 'magic stick wah wah!!' - but that does not change the basic scientific facts of how it actually works, and if you come back to Canada and wave your arm around shouting booga booga and telling the natives you are a great god with Magic Progressive Collapses - well, at least some of us wonder what the hell you are actually trying to prove here. It sure as hell has nothing to do with real science and physics.  

(for a very thorough and scientific 'debunking' of the 'math' and 'physics' of Bazant, Greening, Garcia, Pants et al - http://www.journalof911studies.com/articles/Article_3_RossReply.pdf .)

Nice wall of text. You make several incorrect assumptions. It would take too long to list them as you have made so many. Perhpas you could focus on a single issue and expand on that?

Pants-of-dog

Fidel wrote:

All calculations of force begin with the motion equations. And apparently we have a new axiom: Anti-Newtonian non-truthers don't know what they are talking about in general.

I will ask you again. What is the difference between v and delta-v?

Fidel, I also suggest that you refrain from making personal comments. That did not work out for you last time, did it?

Pants-of-dog

jas wrote:
Pants-of-dog wrote:
You never mentioned pulverisation before. And now you are.

Why do you shift the proverbial goalposts?

I've never mentioned pulverization? LOL. I think even Yiwah can tell you you're wrong, But no matter. Does this ruin your house of cards analogy?

writer wrote:
I've got to say, pulverization is and has been one of jas's main points.

Jas never mentions pulverisation in the post to which I was reponding.

This one:

jas wrote:
The impact zone is the line between C and A. He leaves C the same size, unlike what we see happening in the videos, but he doesn't need C to shrink in size in order to show how absurd this model is.

Bjorkman's illustration makes obvious what is wrong with the model, Pants. You can't have a smaller something crunch through a larger something of the same material--in the case of a building, for much more than a few floors. There is no precedent in nature or engineering that would support this model. Bazant's math is made up to legitimize what is illegitimate scientifically.

Please note that there is no mention of pulverisation in your post describing Bjorkman's axiom.

So, when I was responding to this quote with the example of a house of cards as a structure that has a smaller something crunch through a larger something of the same material, I did not need to discuss pulverisation. 

So, when jas brings up pulverisation as a reply to that specific post, he is shifting the goalposts. After all, Bjorkman does not discuss pulverisation in his axiom.

writer writer's picture

Quotes for the truthers, quotes for the debunkers. Quotes, quotes, quotes. It's a mug's game.

[url=http://www.debunking911.com/quotes.htm]firefigher quotes[/url]

[url=http://www.debunking911.com/civil.htm]civil engineer quotes[/url]

[url=http://www.debunking911.com/explosions.htm]explosions[/url] (includes quotes from Rodrigues)

A discussion: [url=http://educationforum.ipbhost.com/index.php?showtopic=9426]The Ever Changing Story of William Rodriguez[/url]

writer writer's picture

All I can say is that jas mentions pulverization often. I'm not keeping score post by post. Nor do I really follow all the names being thrown out. I'm not good with the names of the people I actually meet and know. My head might break if I take on a long list of last names, associated with mathy stuff.

jas

But pulverization is the reality, pants. So maybe it's better for you to just deal with the reality rather than nitpick over semantics.

My question included the word "crunching". Can you demonstrate how the cards in your house of cards crunch through the rest? In fact, could you elaborate on your house of cards analogy. since I would guess that absolutely nobody finds it terribly convincing.

jas

writer wrote:

Quotes for the truthers, quotes for the debunkers. Quotes, quotes, quotes. It's a mug's game.

[url=http://www.debunking911.com/quotes.htm]firefigher quotes[/url]

[url=http://www.debunking911.com/civil.htm]civil engineer quotes[/url]

[url=http://www.debunking911.com/explosions.htm]explosions[/url] (includes quotes from Rodrigues)

Here's what passes for analysis on Debunking 911:

Quote:

Even bodies hitting the floor sounded like explosions.

“The sight was amazing. I was just totally awestruck. I reported to the command post, showed my ID and asked if I could be of use. They said ‘Absolutely. Stand off on the side with the other medical people.’ I couldn’t fight any fires because I did not have that kind of gear with me, but would have done it if asked.

“I decided to walk closer to the South Tower. I was about 100 ft from the South Tower looking up when the bodies started coming down. I counted 35. They were just piling up on the Marriott Marquis hotel. They were 10 to 15 thick piling up one after another. You could hear them hitting on the side streets. They were hitting cars, and there were lots of explosions.

“I have seen plenty of death in my life, and burned bodies and so forth, but this was incredible. As I was looking up, I saw a body coming down, hit a lamppost and explode like a paint ball. Its arms and legs got torn off and the head ripped off and bounced right by me.”

We've talked about this site in much earlier threads. They actually don't do much "debunking" --mostly just offering alternative conjecture.

Pants-of-dog

jas wrote:

But pulverization is the reality, pants. So maybe it's better for you to just deal with the reality rather than nitpick over semantics.

My question included the word "crunching". Can you demonstrate how the cards in your house of cards crunch through the rest? In fact, could you elaborate on your house of cards analogy. since I would guess that absolutely nobody finds it terribly convincing.

It is not an analogy. It is an example of a structure that disproves Bjorkman's axiom.

Bjorkman claims, incorrectly, that it is impossible for a smaller structure to collapse a larger structure of the same composition. Anyone who has built a house of cards knows that a structure made of playing cards can be totally collpased by one playing card. Therefore, Bjorkman's axiom is not universal, and is therefore not really an axiom, and may not be applicable to the WTC collapses.

jas

Wrong. I said there is no precedent in nature or engineering in which a small something can crunch through a larger something of the same material, and, in case the word "crunch" doesn't make it clear: through gravity alone. A house of cards is not an example that counters this fact.

writer writer's picture

Quote:
since I would guess that absolutely nobody finds it terribly convincing.

Rhetoric alert! I find none of it terribly convincing. Be careful what you wish for.

Pants-of-dog

jas wrote:

Wrong. I said there is no precedent in nature or engineering in which a small something can crunch through a larger something of the same material, and, in case the word "crunch" doesn't make it clear: through gravity alone. A house of cards is not an example that counters this fact.

Sure it is. I can build a house of cards (or dominos) and then, through gravity alone knock it down with a smaller amount of cards. It's not that hard.

jas

Yes, so can I. I can stack some wood blocks up, destabilize one, and then knock them down, too. What's not happening is the errant block is not crushing through the stack of blocks. Do you understand the difference? 

writer writer's picture

Nor were all the papers in the towers pulverized.

I don't know much, but I do know paper rock scissors.

writer writer's picture

I can take any piece of heavy construction paper at any height and drop it. It will not crush the paper below it. I can take a rock and drop it. At a certain height, it will crush / damage the rock below it.

jas

I can stack some coffee tables one on top of the other. 110 of them, reaching up to the ceiling of a warehouse. I can burn a hole through several legs of some tables near the top of the stack, disabling many of them. They will probably topple. What they won't do is crush through the stack below them, pulverising them.

jas

writer wrote:

I can take a rock and drop it. At a certain height, it will crush / damage the rock below it.

Will it?

Pants-of-dog

jas wrote:

Yes, so can I. I can stack some wood blocks up, destabilize one, and then knock them down, too. What's not happening is the errant block is not crushing through the stack of blocks. Do you understand the difference? 

Use dry bread or ceramic tiles if you want that crunchy, crushing effect.

writer writer's picture

Are they also attached together with a series of supports that span each level?

BTW, have you seen BP dealing with a coffee spill? Hilarious!

jas

Absolutely, Pants. I'm glad you find Bazant's "crush down" language funny, too.

But anyway back to the kindergarten physics, like I said, there is no precedent that supports this model. 

Pants-of-dog

jas wrote:

Absolutely, Pants. I'm glad you find Bazant's "crush down" language funny, too.

But anyway back to the kindergarten physics, like I said, there is no precedent that supports this model. 

Before matches were invented, there was no precedent for them. Does that mean the first matches ever invented were a hoax?

In other words, there is never a precedent for something that has not happened before. Nobody ever crashed planes into a building as a terrorist attack before.

Fidel

Pants-of-dog wrote:

Fidel wrote:

All calculations of force begin with the motion equations. And apparently we have a new axiom: Anti-Newtonian non-truthers don't know what they are talking about in general.

I will ask you again. What is the difference between v and delta-v?

Fidel, I also suggest that you refrain from making personal comments. That did not work out for you last time, did it?

I am convinced that you don't know what you are talking about and are simply wasting everyone's time here with your bad math and pseudo-physics, straw man arguments and egregious claims to fact. You can take the math I posted above and verify it with anyone who does understand math and high school physics. I personally guarantee they will validate it for you.

The question here is not whether I understand delta-t or not. It was apparent that you were clueless as to the meaning of delta-t several threads ago. The question of the matter is whether Manuel Garcia committed an error of omission in calculating force balance by neglecting to account for tilting of the upper block, which would effect total force at the instant of impact, which Garcia says happens within 1/100th of a second. Neither Garcia nor Bazant have accounted for tilting. That is an error of omission. It would not change things whether calculus or high school math is used to describe the 3-metre free fall and collapse initiation.

 

writer writer's picture

... Or at least *these* buildings, or buildings like these. With *these* kinds of planes.

Pants-of-dog

Fidel wrote:
I am convinced that you don't know what you are talking about and are simply wasting everyone's time here with your bad math and pseudo-physics, straw man arguments and egregious claims to fact. You can take the math I posted above and verify it with anyone who does understand math and high school physics. I personally guarantee they will validate it for you.

The question here is not whether I understand delta-t or not. It was apparent that you were clueless as to the meaning of delta-t several threads ago. The question of the matter is whether Manuel Garcia committed an error of omission in calculating force balance by neglecting to account for tilting of the upper block, which would effect total force at the instant of impact, which Garcia says happens within 1/100th of a second. Neither Garcia nor Bazant have accounted for tilting. That is an error of omission. It would not change things whether calculus or high school math is used to describe the 3-metre free fall and collapse initiation.

I will say this one final time:

Garcia uses delta-v in his equations.

You use a constant v in your equations.

Therefore your delta-t is not the same as Garcia's.

writer writer's picture

Simple rhetorical point: You don't have to argue your way out of a burning paper bag. It'll be gone soon enough.

jas

Pants-of-dog wrote:

Before matches were invented, there was no precedent for them. Does that mean the first matches ever invented were a hoax?

In other words, there is never a precedent for something that has not happened before. Nobody ever crashed planes into a building as a terrorist attack before.

It doesn't matter what caused the holes in the upper floors. Do you understand?

You asked for the objections to the NIST/Bazant model. This is the big one. This is  based on known and accepted physical principles. If your model violates these, you have some 'splainin' to do. You asked how the NIST/Bazant theory violates laws of physics. This is how.  If you can't deal with this in plain language terms, you are not able to defend your argument.

Fidel

Pants-of-dog wrote:
I will say this one final time:

Garcia uses delta-v in his equations.

I used the same instantaneous velocity Garcia used in his force balance equations. You're barking up the wrong tree, 'dog.

jas

.

Pants-of-dog

Fidel wrote:

Pants-of-dog wrote:
I will say this one final time:

Garcia uses delta-v in his equations.

I used the same instantaneous velocity Garcia used in his force balance equations. You're barking up the wrong tree, 'dog.

Garcia does not use an instantaneous velocity to calculate delta-t.

Pants-of-dog

jas wrote:
I don't want your math, Pants.

Why not? If you have trouble understanding it again, I can clarify it one more time if you like.

 

jas wrote:
There is no precedent in nature or engineering that supports a small something crushing through a larger same thing through gravity alone. You asked for the objections to the NIST/Bazant model. This is the big one. If you can't deal with this principle in plain language terms, then it's obvious you're not able to defend this argument.

I have shown how a house of cards (or dominoes or dry pieces of bread) is an example of a structure that will globally collapse if a small portion of the structure falls on a larger portion.

There. I dealt with it in plain language terms.

I have a question that will probably be ignored.

If thermite was used to destroy the structure, how did they keep the thermite from igniting when the planes hit?

Pants-of-dog

jas wrote:

.... This is  based on known and accepted physical principles. If your model violates these, you have some 'splainin' to do. You asked how the NIST/Bazant theory violates laws of physics. This is how. ....

Bjorkman's axiom is not a known and accepted physical principle.

siamdave

Pants-of-dog wrote:

Nice wall of text. You make several incorrect assumptions. It would take too long to list them as you have made so many. Perhpas you could focus on a single issue and expand on that?

- that's pretty much what I mean by ducking and dishonesty - people take your entire theory apart, with example after example, and you cleverly respond 'nice wall of text' and demand we get back on your endless merry-go-round. We might say the same in spades about NIST, FEMA, the 911 Commission, etc. except my purpose is searching for the truth, theirs is hiding it. I guess we know which side you're on.  I hope my contributions have helped some see through your attempted deceptions.

jas

Pants doesn't seem to recognize that the request for an example in which a smaller something can crush through a larger something through the force of gravity alone is a request to back up the NIST/Bazant hypothesis with physical principles that are demonstrated elsewhere in nature or engineering.

You can't simply say "this was a unique event, therefore the regular laws of physics don't apply." The request for an example is not a request to explain the "uniqueness" of the WTC collapses, it's a request to verify that the model being used to explain them is supported by laws of physics. All he has done is refer to Bazant's math, which we know already violates these principles. Pants has been unable to come up with his own examples of how "crush down" occurs elsewhere in nature or the manufactured world.

jas

Pants-of-dog wrote:

Bjorkman's axiom is not a known and accepted physical principle.

What is "Bjorkman's axiom"?

Pants-of-dog

siamdave wrote:

- that's pretty much what I mean by ducking and dishonesty - people take your entire theory apart, with example after example, and you cleverly respond 'nice wall of text' and demand we get back on your endless merry-go-round. We might say the same in spades about NIST, FEMA, the 911 Commission, etc. except my purpose is searching for the truth, theirs is hiding it. I guess we know which side you're on.  I hope my contributions have helped some see through your attempted deceptions.

Now you are claiming that I am being dishonest?

What I asked you to do was to summarise Bjorkman's argument. How is that dishonest?

Jas was able to succintly paraphrase Bjorkman's axiom, and we have been discussing it for the last few posts. I find that such a technique is more conducive towards moving the discussion forwards than simply saying that your opponent is a liar.

Pants-of-dog

jas wrote:

Pants doesn't seem to recognize that the request for an example in which a smaller something can crush through a larger something through the force of gravity alone is a request to back up the NIST/Bazant hypothesis with physical principles that are demonstrated elsewhere in nature or engineering.

You can't simply say "this was a unique event, therefore the regular laws of physics don't apply." The request for an example is not a request to explain the "uniqueness" of the WTC collapses, it's a request to verify that the model being used to explain them is supported by laws of physics. All he has done is refer to Bazant's math, which we know already violates these principles. Pants has been unable to come up with his own examples of how "crush down" occurs elsewhere in nature or the manufactured world.

Please show how Bazant's math violates a law of physics.

jas

Pants-of-dog wrote:

I have shown how a house of cards (or dominoes or dry pieces of bread) is an example of a structure that will globally collapse if a small portion of the structure falls on a larger portion.

There. I dealt with it in plain language terms.

You haven't shown anything. You have used an incorrect non-analogous example. Cards don't crush through each other.

Find a better example.

For example, Writer suggests that you can drop a small rock on a bigger rock and the rock below will break. Do you think this is true?

Pants-of-dog

jas wrote:

What is "Bjorkman's axiom"?

Quote:
This is all in accordance with the Björkman Axiom regarding structures:

A smaller part of an isotropic or composite 3-D structure, when dropped on and impacting a greater part of same structure by gravity from above, cannot one-way crush down the greater part of the structure.

http://heiwaco.tripod.com/mac5.htm

Pants-of-dog

jas wrote:

You haven't shown anything. You have used an incorrect non-analogous example. Cards don't crush through each other.

Find a better example.

For example, Writer suggests that you can drop a small rock on a bigger rock and the rock below will break. Do you think this is true?

Not all the time, but deinitely some of the time. If I drop a small pebble of limestone onto a granite boulder from a height of 3 cm, it won't do anything. If I drop a coffee table made entirely of slate onto the table tops of a structure made of slate coffee tables, I think there will be significant breaking of the lower structure.

jas

Quote:

Quote:
This is all in accordance with the Björkman Axiom regarding structures:

A smaller part of an isotropic or composite 3-D structure, when dropped on and impacting a greater part of same structure by gravity from above, cannot one-way crush down the greater part of the structure.

Please show how this is not supported by physical laws.

jas

Pants-of-dog wrote:

Not all the time, but deinitely some of the time. If I drop a small pebble of limestone onto a granite boulder from a height of 3 cm, it won't do anything. If I drop a coffee table made entirely of slate onto the table tops of a structure made of slate coffee tables, I think there will be significant breaking of the lower structure.

You change the examples in mid argument. What happens when you drop a granite rock onto a larger granite rock? Or even onto a similar size rock?

Pants-of-dog

jas wrote:

 

Here is what Bazant's math argues:

<once again snipping Bjorkman's incorrect image>

Small upper block C crunches through intact building A in under 13 seconds. Small things don't crunch through larger same things. If you disagree with this, show us where in nature this happens.

I disagree. I already showed you an example disproving the bolded claim.

jas

Pants-of-dog wrote:

Please show how Bazant's math violates a law of physics.

Here is what Bazant's math argues:

 

 

 

 

 

 

 

 

 

 

 

Small upper block C crunches through intact building A in under 13 seconds. Small things don't crunch through larger same things. If you disagree with this, show us where in nature this happens.

Pants-of-dog

jas wrote:

You change the examples in mid argument. What happens when you drop a granite rock onto a larger granite rock? Or even onto a similar size rock?

Depends on how the rocks are shaped.

jas

What was your example?

Pants-of-dog

jas wrote:

Quote:

Quote:
This is all in accordance with the Björkman Axiom regarding structures:

A smaller part of an isotropic or composite 3-D structure, when dropped on and impacting a greater part of same structure by gravity from above, cannot one-way crush down the greater part of the structure.

Please show how this is not supported by physical laws.

I did, with my house of cards example. Of course, the material is somewhat irrelevant. To get actual crushing, you would need something brittle like ceramic tile or dry bread.

jas

Pants wrote:

Depends on how the rocks are shaped.

Let's say then, two concrete, rectangular blocks standing vertically on a concrete floor. You drop one on the other. What happens to the one dropped compared to the one on the warehouse floor? Now do the same experiment with the dropping block smaller than the one on the floor.

jas

Just want to remind anyone who is still reading this that we use the experiment of a drop from a height to help out the supporters of this absurd theory, although this was not the case in the WTC where it is estimated by NIST that 85% of the structural columns remained in the floors where the jets impacted.

Pants-of-dog

jas wrote:

Let's say then, two concrete, rectangular blocks standing vertically on a concrete floor. You drop one on the other. What happens to the one dropped compared to the one on the warehouse floor? Now do the same experiment with the dropping block smaller than the one on the floor.

Okay, drop it from a height of 8 inches, which is the approximate height of a concrete masonry unit. Probably nothing will happen. Now drop it from two feet. The top block might get scratched up, but no serious damage. Now drop it from 100 feet. Chances are most of the bricks get broken. From this thought experiment we can see that the height of the fall is one factor.

Now, let us use glass blocks instead of concrete ones. I think we can say with some certainty that we won't have to drop the top block from quite as high to break all of the lower bricks. From this thought experiment, we can see that the material is another factor.

Now, let us go back to the concrete blocks. This time, stack 78 on top of each other. Drop 19 blocks onto them from a distance equal to 6 blocks. This will make more of a mess, so we can see that the number of blocks on top and on the bottom is yet another factor.

Now, let up make two piles of blocks, one in a large square and another in a smaller square completely contained by the larger square. Like the perimeter columns of the WTC and the core. Drop squares of blocks on top of the other squares. If you are increibly lucky and manage to land the upper two squares on the top of the lower squares, you can hope that the whole thing won't collapse too much, but if it tilts at all, the squares won't line up and the blocks will fall. From this we can tell that the relative geometry of the upper and lower blocks is a factor.

Now, take a pile of glass and metal coffee tables, 105 tables high, in a square completely enclosing another square. Put flammable contents between the separate tables, smash the 6 levels of tables above the 78th "storey" by driving a small vehicle in there with a full gas tank, light the flammable stuff in this area on fire, wait an hour or so, and see how many of the tables are still standing.

jas

Pants-of-dog wrote:

I did, with my house of cards example. Of course, the material is somewhat irrelevant. To get actual crushing, you would need something brittle like ceramic tile or dry bread.

Your house of cards, or house of concrete slabs (for all it matters) example is not an example of anything crushing through anything else. You are talking about things toppling. Please find a true example.

The other thing I would ask is, are you questioning the "crushing down" effect that is claimed by Bazant?

writer writer's picture

Quote:

For example, Writer suggests that you can drop a small rock on a bigger rock and the rock below will break. Do you think this is true?

This isn't what I wrote. I said nothing of size. As far as I know, the towers were rectangular, with each floor matching the square foot of the one above. And a huge section of the top floors together pancaked down each single floor below the point of impact. I'm not a mathmetician or physicist, it's true. But that is what I see when I watch the collapse. 

A tip: I am not swayed when you insult me or misrepresent what I write.

A small meteor can do very serious damage to things much bigger than itself, though I'm sure gravity isn't the only thing in play. Just as, in the towers, structural weakening below from jet fuel, glass blowing out, various fires and so on would have also had influence.

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