WTC collapses - Layman's terms again

strange, you accept Bazant's paper without the math to some of his fundamental assumptions, but one of the points you point out to me, when i would try to bring up a paper, that i have to include the math.

that is a double standard.

Which assumptions are these again? If you think they are wrong, it is up to you to show that an analysis with different assumptions result in a different conclusion. It's that simple. If the assumption is wrong, change the problem, do the problem and show us the result.

Just saying that is wrong because you personally think it's wrong isn't enough.
 
i disagree, and claim, that a nonlinear full scale FEA model simulation will be far more accurate as a onedimensional elementary calculation pseudscience paper.

Rustle up ten million dollars in computer power, another couple million in billable engineering and IT time and you might be able to do it!
 
Rustle up ten million dollars in computer power, another couple million in billable engineering and IT time and you might be able to do it!

i knew the US science is not so far behind the Chinese :)
alot of your commrades here do not belive that it is in any way possible.
 
:boggled:

must be a lang problem, i dont get it, asplode like ass?
 
ANSYS LS-DYNA
For simulating complex, nonlinear phenomena that result from processes producing deformations, ANSYS LS-DYNA helps engineers understand the complexities involved with crash tests, metal forging, stamping and catastrophic failures.

Apparently you are not aware of the limitations of programs like ANSYS.
 
I would be interested to see ANY computer programme which could model a non-linear collapse such as occured at WTC.
 
I would be interested to see ANY computer programme which could model a non-linear collapse such as occured at WTC.

The problem isn't so much modeling it as recreating it. The first only requires a colossal amount of computer power and time; the second is impossible.
 
And yet, at various times on this (and other) threads you have laboured under the (later denied) misapprehensions that:

  • structural steelwork is not susceptible to fire-indeced failure under normal (never mind aircraft impact) conditions, notwithstanding a wealth of evidence to the contrary in the form of internationally recognised testing criteria and buidling reglations/codes.
  • you believe that the lower structure had sufficient reserve capacity to accommodate the imposed kinetic loads arrising from collapse and the changing load path routes as the collapse sequence progresses, notwithstanding your apparent inability to produce any meaningful structural calculations to support this assertion.
  • You support the patently incorrect assertion that both the core and external load-bearing envelope would have stood in isolation, i.e. without the cross-bracing effect of both floors and hat trusses, in direct contradiction to every other technical account of the towers and with scant regard to issues about transferrence of wind loads and bending moments.
  • You have suggested that a pastic garden table is a suitable structural emtaphor - or analogy, take your pick - for the towers.
Heiwa, you're a fraud. You clearly have no grasp of structural issues or the construction of buildings. You have claimed that your paper is peer reviewed when it is clearly not. You have claimed to answer technical criticism on this site, but instead have simply posted evasive responses and hand-waved away rejoinders. You claimed to have given evidence to the US government, but it tured out just to be someone citing your work. Doubtless if I keep looking, I will find more.

And this before I even note that, in a previous life, you appear to have been a no-planer.

Of course fire/heat will affect steel ... but not cause free fall of an upper block. Big difference. Fire/heat does not remove supports allowing sudden free fall. Just softens the supports allowing a very soft movement down. Soon stopped. Happens everytime.

Evidently the lower structure will withstand the upper block falling on it!! The strength of the lower structure occupies only 0.13% of the area of the structure. The upper block misses that ... and gets entangled in some weak floors and the collapse is arrested. Basic.

Of course the four perimeter walls on the outside and the core structure on the inside would stand in isolation. Only connected by bolted floors. Easy to show in any structural analysis.

Plastic table. Just inspiration. Paper peer reviewed? Pls read message #1. Of course I have given evidence to US authorites. To Congress (about how to protect the marine environment with better ship design) and to NIST that it forgot to consider collapse arrest. NISt answered and referred to some FAQs about floors fallingd down. Doesn't make any sense.

Sorry, you are wrong on all accounts. Of course, all OT. As usual. Topic is collapse arrest. Happens every time when steel structures are locally heated.
 
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Apparently you are not aware of the limitations of programs like ANSYS.

ORLY?

what would hinder me to make a far less simplified model than Bazant is using.

and with what software did NIST try it? and whats the exact reason they stopped it? in case they did try it, did they?
 

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