Ziggi, the core would have been self-supporting as a unit.
Bare assertion fallacy. Tony, can you please refer to the structural engineering qualification that backs up that remark? You see, you have a reputation round here for just making things up to support what you want to believe. And now, it's time for you to start pretending some more of the evidence doesn't exist. This time it's the well-known core spires that were left standing for a few seconds after the main collapses, before falling under their own weight. Clearly they weren't destroyed by explosives during the collapse, yet there they were. Are you going to make up a new fairy story about some of the charges failing to go off?
Now, in the light of a recent, much-praised (and with good reason) post of luchog's, I think it's worth pointing out for the impartial observer (Georgio, I think that may just be you at the moment) what Tony has been doing here. Let's start from his Missing Jolt model, which assumes the following:
The collapse starts by exactly one floor's worth of structural supports completely vanishing from an otherwise undamaged structure. This is the only possible way a "natural" collapse can possibly start, and it is impossible that the structure below this level is significantly weaker than when it was built. Also, every disappeared section of supports is exactly the same length and there is no deformation of the structure around it. The top block then falls through empty space on to the undamaged structure below it, at the acceleration due to gravity. It then hits the undamaged structure below it, and this causes a jolt. The only way that a jolt could possibly not happen is if the supports below are destroyed by explosives at precisely the moment the upper structure is about to hit them, removing them completely so that they cannot slow its fall in any way. The upper section then continues to fall, again at 1G acceleration, because nothing is stopping it.
Now, it should be obvious from the above that
any impact on a structure below that's capable of causing resistance will give a jolt. But the most recent problem that's been pointed out with the above model - I say most recent, because it's already been repeatedly pointed out that the whole thing is complete nonsense from start to finish - is that the upper block didn't fall at 1G acceleration, but only about 2/3G. This means that something must have been resisting its fall, and it's obvious that this something,
whatever it was, must have been just as able to cause
some level of jolt; but Tony maintains that there was
no jolt, because his interpretation demands that there was none.
Now he could claim that there were no explosives destroying the perimeter columns, and it was just the core columns that were destroyed, because that way he can explain away why none of the explosions were visible. But clearly the perimeter columns, which actually carried more loads than the core (they were designed to resist wind loads as well as structural and live loads) would still give more than half the jolt he predicts from the whole structure. So, in order to get round this, he's arbitrarily declared three new things to be true. Firstly, he's persuaded himself to believe that some of the dust thrown out by air being expelled in the fall of the towers was in fact explosives destroying the corners of the perimeter column structure, despite the absence of the unmistakable flashes seen from real world demolition charges. Secondly, he's then declared that, as a result of these, the remaining sheets of perimeter column weren't strong enough to carry the static load of the upper block - that, in itself, is reasonable, but he glosses over the fact that these explosions would weaken the structure so much that it would clearly collapse under its own weight and would offer no resistance to the falling block, and certainly not the one-third of its weight that he needs it to have had. And finally, he produces directly from his rectal orifice the claim that a structure that can't support the static weight of the upper block will produce no jolt at all - an utter absurdity, because it's immediately obvious that, if his model were correct, there would
always be a jolt, but proportional in strength to the strength of the structure below. So he's trying to have his cake and eat it; he wants the resistance of the perimeter columns to be so insignificantly small that it produces no jolt, and
at the same time large enough to reduce the acceleration of the top block by a third, effectively supporting a third of its weight.
It's obvious, first of all, that his Missing Jolt model has no predictive power at all; he has to make up extra conditions even to describe the single case he created it to describe, so clearly it has zero scientific merit. But even worse is that he has to make up conditions that contradict the evidence (for example, the inward bowing seen in both towers, that he has to deny the validity of because he knows it completely refutes his analysis), and that contradict each other. And all this in support of a model that starts from a perfectly ordered "natural" collapse, ordered to a level that
could only be produced by demolition explosives in the first place; what else could precisely remove exactly one floor's worth of columns without damaging any other part of the structure? Not the complicated and chaotic destruction produced by the impact of an airliner and an hour or two of fires that continually moved location and caused floors to sag, columns to weaken and differential expansion and contraction to do all sorts of damage to the structure over several floors. But that's another part of the evidence Tony tries to pretend doesn't exist; just scroll up to see how barefacedly he pretends that there was nothing weakening the lower structure. Breathtaking dishonesty.
And finally, he says he can't think of any way the structure could have collapsed without producing a jolt. This is not just the argument from ignorance; it's the argument from wilful ignorance, because several of us have repeatedly told him how it could have happened. He chooses to ignore it all, because it's inconvenient.
Tony will probably reply to this post in one or more of four ways:
(1) I'm an engineer, so how dare you question what I say?
(2) It should be obvious to anyone that I'm right.
(3) You're not intelligent enough to understand that what you're saying is wrong.
(4) You're part of the conspiracy and you're lying to discredit me.
None of these have anything to do with the actual matter under discussion, so can be safely ignored.
As can Tony.
Dave