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OOS Collapse Propagation Model

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Careful, he may add you to the Brotherhood of Big Sheep.

Dave


Dave, Have you ever read BV and BL?


You have a PhD in physics. I have at least 74 specific questions already prepared and posted to see how you understand specific comments made within the papers. You should be able to answer some of them if you read the papers. I'd really like to get a few of your answers in writing.
 
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Ozeco, are you finished with your current exchanges on the BV and BL papers? I'll patiently wait until you've had your say, and then it will be my turn.
 
Is anyone else interested in wasting any more of their time with this? I'm not. Femr2 is asking for evidence of things that happened IN THIS VERY THREAD. I'm not going to play that game.

Major_Tom wants to argue against a strawman Bazant. Repeated quotes from the paper (some of which he has provided) doesn't seem to persuade him that he is looking at the papers wrong. He also wants to say that he's the first person to come up with the idea of the columns not hitting each other. Here's a post by PhantomWolf from my very first thread on this forum:



That's May 2007. Before Major_Tom even joined this forum.

If you'll excuse me, I'm going to go off and do something more productive than talking with liars and boasters now.

It's almost like Page 1 never happened...

True
 
Ozeco, are you finished with your current exchanges on the BV and BL papers? I'll patiently wait until you've had your say, and then it will be my turn.
Your turn. My preference for explaining these issues - as always - is to present reasoned, coherent and comprehensive argument. I have done that and there is little zero interest in discussion at that level. Some members have decided to "play the man not the ball" by attacks on my personal credibility.

I will continue my normal practice of ignoring personal slights. And there is little point in responding to those game playing members who post assertions THEN deny them within two posts.

The floor is yours. I may still respond to those members who behave honourably with legitimate on-topic technical issues OR technical issues which are relevant responses to what I have posted OR the strict theme of the topic OP.

BTW Congratulations on your post #2924 which is a reasoned statement of the behavioural memes reality without the "over bidding" I usually disagree with. I would welcome discussion of the "memes" and other behavioural aspects - but obviously not on this forum - I continue to doubt that it is suitable material for discussion on any forum.
 
I may still respond to those members who behave honourably with legitimate on-topic technical issues OR technical issues which are relevant responses to what I have posted OR the strict theme of the topic OP.

Well, while we're waiting, we could discuss your reasoning for wanting a column-spacing factor in the model. Shouldn't the total floor shear capacity be the total floor load plus a factor of safety, regardless of column spacing? Or, we could discuss whether or not the perimeter wall would have more of a "funnel" effect with wider column spacing. Or, whether any such "funnel" would make much difference in a 200-foot-wide building.
 
Well, while we're waiting, we could discuss your reasoning for wanting a column-spacing factor in the model. Shouldn't the total floor shear capacity be the total floor load plus a factor of safety, regardless of column spacing? Or, we could discuss whether or not the perimeter wall would have more of a "funnel" effect with wider column spacing. Or, whether any such "funnel" would make much difference in a 200-foot-wide building.

Ooops - I had overlooked that issue - wasting too much time on trivia. :o :blush:

It forces me to think seriously. And at this time 19:32 Kilo and 1/2 bottle of red under the belt.....

I'll respond as soon as the brain clears for serious stuff. And I think it will be exploratory thinking - it is an issue I've been taking for granted - so I need to see if my ideas are:

1) Valid; and
2) explainable.

"2" might be the bigger challenge....let's see.
 
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Many in the threads linked earlier. Here is one in which you repeat pretty much every empty meme on the subject in a few short sentences:

You replied to the following question in which Bazant is answering a known truther asking about the WTC towers specifically:

6) Or how about this from BL:

"Blocks C and A can, of course, deform. Yet, contrary to
the discusser’s claim, they may be treated in calculations as
rigid because their elastic deformations are about 1,000 times
smaller than the deformations at the crushing front."

This is how Dr Bazant justifies the survival of the upper block until reaching earth in BL

Do you honestly believe this claim? (Do you hallucinate upper blocks, too?)


You gave the following answer in which you repeat pretty much every empty meme on the subject in a few short sentences::

[an INCOMPLETE quotation of my post #1369]

Pretty much every vulnerability I have been pointing out is demonstrated by you within this comment.


!) Blind appeal to authority
2) Expressing views on 2 papers you have never read
3) Literal interpretation of 'upper block'
4) Literal interpretation of 'lower block'
5) Belief that Bazant shows within BL that "the upper block would indeed stand a very good chance of staying largely assembled until crush-down is done."


By agreeing to this, you agreed with the Bazant statement from BL, when asked about the WTC towers specifically, that the 'upper block' and the 'lower block' can deform, but they may be treated as rigid because their elastic deformations are about 1000 times smaller than than the deformations at the crushing front.

You are either spectacularly incompetent at reading, or disgustingly dishonest.

"1.) Blind appeal to authority"
Blind?!?!?!?!?!?!?!??! How STUPID is that???
I think I made it abundandly clear and unmistakable explicit that my appeal to authority is NOT blind:
Oystein said:
To answer the question "Do you honestly believe this claim?" my tentative answer is: Yes, I do believe BL's claims. Why? Because I have seen no competent argument against it, and I am too much of an amateur to argue with experts on the matter.
If you say you don't believe them, I won't follow you, because I do not know that you are an eminent expert. In fact I already know that you suck at math and geometry and are very stubborn when it comes to correcting your own mistakes.
Maybe B&L also suck at math and are stubborn - I don't know. So from everything I know, I have reason to distrust you, and no reason to distrust them.
Yes, this is an argument from authority, but not from false authority.
See? All the relevant disclaimers properly attached. So that's why I asked you to provide a well-reasoned argument to supercede that authority:
Oystein said:
What it takes is for you to show that
- the assumptions aren't well conceived,
- the formulas are wrong or n/a,
- or the math is faulty
which, I believe, had not happened up to that point (20th January 2011), or at least I had not been aware that you had actually shown any such faults in B&L.


"2) Expressing views on 2 papers you have never read"
What's wrong with that? It was YOU who asked me to express a view on the papers (M_T: "Do you honestly believe this claim [in BL]?"), and now you criticize me for giving you what you requested? What a disgustingly dishonest tactic! Shame on you!
I was very clear on the status of those views:
Oystein said:
Why are you asking for a belief? How would an answer further our quest to find the best answers to the ultimate questions at hand? ... I know way too little about structural engineering to fully assess B&L's assumptions, formulas and math. ... It doesn't matter if tfk, WDC, I or you believe Bazant or not. ... my tentative answer is: Yes, I do believe BL's claims.
So did I express STRONG views then? YES or NO, Major_Tom? Don't lie again when you answer this!


"3) Literal interpretation of 'upper block' "
In the entite quote, I offer no "interpretation" of 'upper block' whatsoever - in fact, I do not mention 'upper block' at all. So why did you invent this? Why do you lie into my face, M_T? Stop the goddam LIES already, will you??


"4) Literal interpretation of 'lower block'"
You reinforce the above LIE - you goddam liar - shame on you!


"5) Belief that Bazant shows within BL that "the upper block would indeed stand a very good chance of staying largely assembled until crush-down is done.""
I think your reading comprehension sucks, because I did not say in that quote that I "believe that Bazant shows within BL" that "the upper block would indeed stand a very good chance of staying largely assembled until crush-down is done". Instead, I said that B&L "BL contains the assumptions, the formulas and the math to show" that "the upper block would indeed stand a very good chance of staying largely assembled until crush-down is done". Notice the difference? I followed this up by questioning those assumptions, the formulas and the math:
Oystein said:
What it takes is for you to show that
- the assumptions aren't well conceived,
- the formulas are wrong or n/a,
- or the math is faulty
And indeed, looking at B&V right now, in point 4. of their reply to Gourley, the restate and refine their assumptions in BV, present some formulas, and show the results after running some math, all to show that crush-down would occur only after the completion of crush-down. So I made a true statement about the content of BL - NOT an expression of my belief - AND I posed a question to you, asking you to show what's wrong with the content of BV.


"By agreeing to this, you agreed with the Bazant statement from BL, when asked about the WTC towers specifically, that the 'upper block' and the 'lower block' can deform, but they may be treated as rigid because their elastic deformations are about 1000 times smaller than than the deformations at the crushing front."
I already quoted all the qualifications attached to my TENTATIVE "Yes", which you all ignored in your boundless dishonesty.



So, to get back to my original question, which I asked you answer with a direct Yes or No:
Do you claim that I, Oystein, have expressed strong views of any kind over BV and/or BL?
Please do not forget about the emphasized word that was in the question from the very beginning, when you pen your answer of "Yes" or "No".
 
And also, the first line of my post back then makes it crystal clear what my objective was:
MT,
may I pick one of your questions to show the methodological problems I have with you? ...
Please try reading my old post again, in its entirety and context and note:

- It was NOT meant as an expression of my beliefs about BL or any other paper
- It was about you method approaching the discussion.

Of course, if you snip off that first line, and several others, and ignore further important points, it's easy to totally misrepresent what I wrote as expressing "strong views" about papers.
 
Interesting the idea of being criticized for expressing a view on a work one has not read. This can appear, at first blush, a valid criticism until one realizes the nature of trust and legitimacy in any viable epistemological position requires one do exactly that, pretty much all the time, pretty much all of one's life.

A trivial example is I have never read Bertrand Russell's Principia Mathematica, yet I have strong views about it - namely, that Goedel's incompleteness theorems guarantee the project cannot be both consistent and complete, something taught every logic student at some point or another. I believe this. Does this make my belief a target for criticism?

In fact surviving is essentially impossible without such a reliance on systems of beliefs one has not personally investigated, vetted, proven or otherwise personally digested from the source.
 
...
"3) Literal interpretation of 'upper block' "
In the entite quote, I offer no "interpretation" of 'upper block' whatsoever - in fact, I do not mention 'upper block' at all. So why did you invent this? Why do you lie into my face, M_T? Stop the goddam LIES already, will you??
...

I have been alerted in private message (thanks!) that the hilighted bit is false - I did mention 'upper block' in the phrase "BL contains the assumptions, the formulas and the math to show that the upper block would indeed stand a very good chance of staying largely assembled until crush-down is done".

Brain fart on my part. I stand by the main point however that I offer no "interpretation" of 'upper block' whatsoever.
 
Your turn. My preference for explaining these issues - as always - is to present reasoned, coherent and comprehensive argument. I have done that and there is little zero interest in discussion at that level. Some members have decided to "play the man not the ball" by attacks on my personal credibility.


This sounds very noble and all. Until one learns that what you actually mean is that you are perfectly willing to make claims like this:

Those assertions are true. Most importantly you confirm that Myriad rested on BV (specifically BV at this stage) I agree that also.


But when asked to support them, e.g. by showing where and how I "rested on BV," it suddenly becomes a personal issue that's beneath you to address.
 
Interesting the idea of being criticized for expressing a view on a work one has not read. This can appear, at first blush, a valid criticism until one realizes the nature of trust and legitimacy in any viable epistemological position requires one do exactly that, pretty much all the time, pretty much all of one's life.

A trivial example is I have never read Bertrand Russell's Principia Mathematica, yet I have strong views about it - namely, that Goedel's incompleteness theorems guarantee the project cannot be both consistent and complete, something taught every logic student at some point or another. I believe this. Does this make my belief a target for criticism?

In fact surviving is essentially impossible without such a reliance on systems of beliefs one has not personally investigated, vetted, proven or otherwise personally digested from the source.

The "Argument from authority" is often - and often incorrectly - called a "fallacy". However, it is generally a good idea to put belief in the judgement of authorities and less so in the judgement of a non-authority IF most or all of the following are true:
  1. I am not an authority myself
  2. The claimed authority actually is an authority in the relevant field of study
  3. The claimed authority can be reasonable infered to be sufficiently informed about the facts pertaining to that judgement
  4. There is reason to believe the claimed authority has studied those facts using methods commonly accepteted in the relevant field of study
  5. The authority is not contradicted by other, equally or more competent authorities
  6. (Corrollary:) The alleged non-authority who contradicts the authority is themselves not an authority, or a lesser authority.
  7. There is no argument of strict logic from true premises that contradicts the judgement of the authority
I allege that Bazant is an authority, that Major_Tom is not, and I know that I am not.
Hence, before studying the more stringent facts and logic, I was right to TENTATIVELY accept the judgement of the authority over that of the non-authority, while at the same time asking for contradictory evidence.
Now I think that Major_Tom has argued, with some success, that Bazant's authority fails on point 3. in that he is not sufficiently informed about the observed featured of the WTC collapses, and this may (or may not) invalidate his authority when it comes to applying the claims to the WTC collapses. Still, all of the arguments in BV may be valid insofar as they address objections to BV raised by Gourley and Szuladzinski, even if they are not, or not fully, applicable to explain the WTC collapses. But I wouldn't know either way.
 
Brain fart on my part. I stand by the main point however that I offer no "interpretation" of 'upper block' whatsoever.

I don't see why it's such a thoughtcrime to refer to the 'upper block'. After collapse initiation it's more or less axiomatic that there were two, mutually unconnected, sections of the original structure, one above the other, and the word "block" to refer to them is as good as any other.

Dave
 
The "Argument from authority" is often - and often incorrectly - called a "fallacy". However, it is generally a good idea to put belief in the judgement of authorities and less so in the judgement of a non-authority IF most or all of the following are true:
  1. I am not an authority myself
  2. The claimed authority actually is an authority in the relevant field of study
  3. The claimed authority can be reasonable infered to be sufficiently informed about the facts pertaining to that judgement
  4. There is reason to believe the claimed authority has studied those facts using methods commonly accepteted in the relevant field of study
  5. The authority is not contradicted by other, equally or more competent authorities
  6. (Corrollary:) The alleged non-authority who contradicts the authority is themselves not an authority, or a lesser authority.
  7. There is no argument of strict logic from true premises that contradicts the judgement of the authority

Great way of putting it. I may start borrowing your list.
 
I don't see why it's such a thoughtcrime to refer to the 'upper block'.

Neither do I, but in the war-of-the-memes that M_T has been waging, it seems he's had some success getting people to shy away from using 'block' and overusing the crap out of 'meme'.
 
The JREF/ISF debunking crowd certainly doesn't help with its tough-on-truthers style, but that cannot be the reason you insist your mission is that of the anthropologist, recording "debunking subculture memes" and insisting you are merely documenting things that to any casual observer are so forlorn, the real motives emerge between the lines despite the pretense.

Frankly I find that to be the real puzzle - why your motivation is given such a pass. The bottom line is that a few folks hurt your feelings, didn't they? Someone owes you an apology, don't they? Probably Ryan Mackey does, doesn't he? It seems the list of folks that ought to address your grievances is the same you constantly cite under the guise of some "meme" they allegedly got wrong, "memes" so trivial they cannot possibly warrant the deep anthropological mission of debunking-subculture-meme-documenter you pretend to be on.

I propose an M_T apology thread. I think it will help everyone.


Actually, the history behind all this is rather amusing. It's all rooted in, believe it or not, the Truth Movement's reaction to NIST NCSTAR.

For obvious reasons, debunkers referred often to NSCTAR when addressing various Truther claims about the collapse of the two towers. The reports were generated by numerous collaborating experts and peer-reviewed, and thus legitimately authoritative. Attacking the credibility of NCSTAR therefore became one of the Truth Movement's top priorities.

One point of attack was that NCSTAR initially did not address the mechanics or energetics of progressive collapse once initiated. (I made the analogy, on several occasions, of a report explaining how a dam broke, omitting any explanation of why the water then poured downhill and leveled buildings downstream.) Instead, it simply stated that continued progressive collapse, once initiated, was inevitable.

Truthers frequently attempted to represent that "omission" as a substantial failure of NIST's duty to investigate the engineering basis for the events. The counter to that argument is that progressive collapse continuing once initiated in a tall structure is not a point that was ever in serious dispute in the engineering community. Ah, but what's the evidence for that? Where are the peer reviewed papers saying so?

That's where Bazant and Zhou's original progressive collapse paper, "BZ," came in. As a limiting case ("best case for collapse arresting") model, it shows that the structure cannot absorb the energy necessary to arrest collapse, and so the progressive collapse proceeds to the ground. All the details of that analysis, such upper and lower "blocks" and "crush-down" and "crush-up," are artifacts of the particular limiting case model. They may or may not apply to the real events, because the real events did not conform to the limiting case; for example, all the columns did not absorb the maximum amount of energy by bending at multiple hinges; instead, they absorbed almost no energy because the connections between the floors and the columns sheared away and the columns ended up breaking apart at their column-on-column welds instead. What does apply to the real case is the demonstrated impossibility of collapse arrest even given the best-case-for-collapse-arrest assumptions.

And that's the entire extent of the relevance of any of Bazant's work to 9/11 conspiracists or their conspiracy theories. (That is, to the topics of this sub forum.) Even if Bazant's calculations in BZ were shown to be wrong, which no Truther has even attempted let alone succeeded at showing, the only effect on 9/11 Truth would be to slightly weaken the debunkers' argument that progressive collapse is a known and expected phenomenon given the conditions existing on 9/11, which in turn would strengthen (to a trivially slight degree) the Truther contention that NCSTAR was negligently incomplete.

Nonetheless, discrediting Bazant by any means possible became the obsession of a portion of the Truth Movement. Such was the intensity of the Truthers' ideological hatred of NCSTAR that even that echo of its echo continues to smolder here and there, including on this thread.

So, if ROOSD is "a better model" than BZ's (which it is in some ways as a math-free casual explanation, and isn't in others) then that means BZ is "wrong," which means that progressive collapse is suspicious, which means that NCSTAR is incomplete, which means... I forget, something about 9/11 and indoor employment that no one even admits to believing any more.

All the better if ROOSD is not only the better model, but one that debunkers never thought of themselves because they were too busy misunderstanding, misrepresenting, and worshipping Bazant's papers. (The latter of which, it seems to now be coming out, were not relevant to 9/11 conspiracy theories in any way, and therefore were rarely mentioned or even read by most debunkers until Major_Tom started asking probing questions about them as part of his ongoing attempts to discredit Bazant.)

The really interesting thing is the success Major_Tom had with his own meme of debunkers misunderstanding, misrepresenting, and idolatrously venerating Bazant's papers, getting even claimed non-conspiracy-theorists to repeat it frequently, apparently in the interest of seeming fair and balanced. If one really were interested in the sociology or memetics of this subforum, it might be more interesting to focus on that, or at least include it.
 
I don't see why it's such a thoughtcrime to refer to the 'upper block'. After collapse initiation it's more or less axiomatic that there were two, mutually unconnected, sections of the original structure, one above the other, and the word "block" to refer to them is as good as any other.

Dave

This depends perhaps a bit on how you picture a "block" - as "rigid" perhaps, or, as you do, as "mutually unconnected". This may be false in the WTC case IF both "blocks" pierce through the rubble layer between them and thus mingle.
The BV-model, it seems to me (but remember: I haven't read it :D), pictured a top block "surfing" on the rubble layer; the rubble is what crushed the "lower block" in Bazant's model, and the "upper block" rides on it safely. But what if columns don't cooperate and refuse to be crushed by the rubble layer, and the blocks poke into each other?
 
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