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The official Explanation(s)
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The official explanation(s) of the WTC 1 (photo above) global collapse (sic) is that the alleged release of potential energy (PE), of the mass of an upper part C above all supporting columns after sudden, local deformation and buckling, due to downward, alleged near free fall movement in an initiation zone (indicated by red) and impact of a structure below, exceeds the strain energy (SE) that can be absorbed by the same columns below and above and that all this was due to gravity only.
It is suggested that the upper part C is rigid and remains intact during the complete crush down of the WTC 1 structure below, i.e. the global collapse (sic) is not a collapse but a 'crush down'.
The crush down is suggested to take place as follows:
WTC 1 is assumed to consist of three parts:
Part A - the lower structure (97 stories before crush down).
Part C - the upper part (13-15 stories).
Part B - rubble that is formed of part A, when part C crushes the stories one after the other.
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Each storey is 3.6 meters tall with density 0.255 and becomes a 0.9 meter thick layer or rubble with density 1.025, when crushed, e.g. [2].
At time t = 0 sec part C is alleged to drop on part A - crush down starts.
At, say, time t = 8 seconds about 60 stories have been crushed and there are still 37 stories remaining of part A. A 54 meters thick layer of rubble - part B - has been formed of what was 60 stories! The upper part C remains on top.
At time t = 10 seconds part A is completely crushed and only a 87.3 meters thick - very tall! - layer of rubble on the ground - part B - remains of part A. The upper part C still remains on top.
At time t = 15 seconds nothing remains! Part C has been destroyed in a crush up and the rubble - part B - is spread out on the ground.
Evidently this crush down model and theory is complete nonsense, but it is the official explanation(s) of the WTC 1 destruction on 9/11! A small, fairly weak part C, 95% air, cannot possibly crush a big part A of similar structure only due to gravity and compress it into a 87.3 meters tall tower of rubble on the ground after 10 seconds! Anyone that has just dropped anything on something knows this. Try then to crush this something! You need a big force for that, which gravity alone cannot provide.
What you would expect to happen
The following would happen, if the upper part C actually drops; two of its thin walls slide and drop outside and do not damage anything. The other two thin walls slide and fall inside the structure - part A - below and punch holes in or slices the floors there locally. No rubble is really formed.
The thin floors of the upper part C are in turn locally punched or sliced by the part A walls/columns below and will soon be jammed inside the part A walls/columns below. No walls or columns are dropping on other walls or columns producing an impact! Do not believe that the upper part C is solid, rigid, strong or anything like that! It is quite weak. Local failures - floors punched and sliced - will be produced at contacts. No crush down will ever start!
Local gravity failures above cannot destroy the columns of the intact structure below! All the energy released by dropping upper part C is absorbed by the deformations, failures and fractures of floors in the initiation zone and locally in the upper part C and top of lower structure part A and by friction between locally failed floor parts rubbing against each other after initiation and by any loose parts dropping down outside. The crush down should be arrested inside the initiation zone! Or maybe upper part C would slip off and drop beside the structure below.
gators911truth.blogspot.com...
“For the towers to fall at so close to free fall speed, over 110,000 separate and independent structural support points had to fail simultaneously. 'Pancake theory' does NOT explain the failure of the cores.” Torin explains passionately, obviously upset with the lies being told to the American people. "Nothing is holding the building up - No resistance. 110,000 structural failures at the same time."
Next, we are shown an incredible bit of detective work on Torins part. He shows a sequence of 12 different pictures (frames above) of the collapse initiation of the North tower, WTC 1. Torin explains that the antenna on the top of the world trade center is a perfect guide of measurement for height, as there is a standard of changing the paint color of antennas once per fifty feet. The part of the antenna on the roof of WTC 1 appears black, then white alternated every fifty feet. There is a guide wire in the bottom left of every picture that shows that the camera does not move.
nationalwriterssyndicate.com...
Originally posted by turbofan
How is that for a run-on, poorly spaced and poorly punctuated paragraph?
You are either: disinfo, in denial, or a moron to support the OCT.
Originally posted by turbofan
YOU , correct ME?
You're all three Mr. Exponent!
Why don't you get yourself into the collapse analysis threads we've
started and check out the obvious use of explosives? You know,
the questions you said you couldn't answer with respect to gravity
as a sole force?
Hey, 'exponent' is going to correct me!
Originally posted by turbofan
Just getting tired of the run-around "exponent".
We finally agree on something! Yes, the building is the object that could
have provided the force to stop rotation of the upper block.
So then "exponent", what happens to kinetic energy once the angular
momentum stops?
Originally posted by exponent
The kinetic energy of the upper section was used up in destroying or disconnecting components. Inelastic deformation (the type of deformation which is permanent) 'uses up' energy. Of course it doesn't actually get destroyed, but it is used to break the bonds in materials. Think of it like boiling water, the energy used to transform water into steam is not gone, it is occupied as a higher potential energy state of the gas molecules.
NIST claims 11 seconds and Lamont-Doherty Near Earth Observatory's seismic data claims 10 seconds for a WTC 1 near-freefall collapse.
Assuming a time of one second for each floor to sheer its connections to the massive core and outer wall sections, and the trusses and the cross-trusses, we would add 97 seconds to the 9 for a total of 106 seconds for your pancaking to take place.
Even dividing the time by four (1/4 second per floor resistance) would leave us 33 seconds pancaking time; far too much greater than the official observed times of 11 and 10 seconds.
Originally posted by turbofan
Let's back up 'exponent'.
We agree and by video evidence know the upper block stopped tilting.
We agree that the only possible force to stop the tilting was provided
by the tower beneath the impact level.
Since the upper block stopped tilting at some point, we know that the
energy generated by angular momentum equalled zero.
Agree, or disagree?
We can estimate that the load was distributed amongst the many perimeter
and core columns at the point rotation ceased.
Agree, or disagree?
We also know that all core columns were not cut, and approximately 4/5
were still intact when the floors stopped rotating.
Agree, or disagree?
Originally posted by SPreston
We understand the concept and it all takes time time time. Both towers took the path of most resistance and it takes a lot of time to break all or most of those connections (over 110,000 separate and independent structural support points).
The official WTC tower crush-down would have taken much much longer without demolition explosives (and) nano-thermite (or) other incendiaries.
Originally posted by exponentAgree, kinda. It's not energy generated by momentum as much as energy stored in the angular momentum. Other than that semantic argument, yes at some point the block has essentially no angular momentum.
We can estimate that the load was distributed amongst the many perimeter
and core columns at the point rotation ceased.
Agree, or disagree?
We can't really say for sure, once the block has rotated even a few degrees, many of the perimeter columns are disconnected and the global collapse has begun. At the point which rotation appeared to cease, the block was tilted by a significant proportion, and no column impacts would be axial.
We also know that all core columns were not cut, and approximately 4/5
were still intact when the floors stopped rotating.
Agree, or disagree?
We don't know this for sure, bending of the core columns would undoubtedly sever them at some point, they were very much not designed to take this sort of load. You'd have to go into a bit more detail before I can agree or disagree.