ozeco41
Philosopher
(b) there was no evidence of any core columns having got any hotter than 250C, ...
We do know that every column which failed in axial overload was hot enough to fail.

(b) there was no evidence of any core columns having got any hotter than 250C, ...

Good catch. I'll give you that one. It is like a double negative and wasn't my intent.
It should have said
The lack of sophistication behind the claims of those adhering to a natural collapse scenario here is incredible or The sophistication level behind the claims of those adhering to a natural collapse scenario here is frighteningly low.
It doesn't actually say you are dumb, just that your claims lack sophistication.
1. You wouldn't see any Jolt anyway as it would have happened inside the building at the core.Things are a little more nuanced than your simple words here explain.
First, a jolt will occur anytime there is an impact and that has to happen in a natural collapse and can happen in a controlled demolition, if impulsive load is depended on to continue the collapse. It can even lead to arrest in either situation if there is not enough momentum to continue it, such as what was seen in the video.
The only time there can be a no jolt situation in a collapse is where the structural integrity is continuously removed artificially.
Sorry, this is a bit late as I'm catching up.Actually there will be a 'jolt' unless all floors are demolished simultaneously. If block A starts moving and when it just about reaches block B, the columns holding block B are severed, the B is moving slower than A therefore transfer of momentum from A to B and thus , technically, a 'jolt'.
That was one obvious big error of Missing Jolt from the outset.Sorry, this is a bit late as I'm catching up.
However, what I can't quite understand whats happening in TZ head in that surely the column would have to be removed, not just severed? I's like he is implying that large lengths of the columns were turned into dust, or maybe ejected!? I can't quite visualize how you would "remove" all the columns using explosives. I would think to be able to "remove" them to prevent any Jolt, not just cut them, would require a huge explosion down the whole length of the building.
Sorry, this is a bit late as I'm catching up.
However, what I can't quite understand whats happening in TZ head in that surely the column would have to be removed, not just severed? I's like he is implying that large lengths of the columns were turned into dust, or maybe ejected!? I can't quite visualize how you would "remove" all the columns using explosives. I would think to be able to "remove" them to prevent any Jolt, not just cut them, would require a huge explosion down the whole length of the building.
The first story may have needed columns cut in the core, but after that is falling just removing joints works to eliminate structural integrity.
Additionally, to take down the Twin Towers it wouldn't be necessary to be artificially removing structural integrity all the way down the building, as at some point the falling debris is enough to cause overload. Something like ten to twenty stories would work and after that the collapse would be self-propagating.
That cannot happen early on. It is the initiation and beginning of the collapse of the North Tower, where the roofline is observable and the descent can be measured, that the lack of deceleration is significant and proves the structural integrity was being artificially removed.
The first story may have needed columns cut in the core, but after that is falling just removing joints works to eliminate structural integrity.
Additionally, to take down the Twin Towers it wouldn't be necessary to be artificially removing structural integrity all the way down the building, as at some point the falling debris is enough to cause overload. Something like ten to twenty stories would work and after that the collapse would be self-propagating.
That cannot happen early on. It is the initiation and beginning of the collapse of the North Tower, where the roofline is observable and the descent can be measured, that the lack of deceleration is significant and proves the structural integrity was being artificially removed.
... to take down the Twin Towers it wouldn't be necessary to be artificially removing structural integrity all the way down the building, as at some point the falling debris is enough to cause overload. Something like ten to twenty stories would work and after that the collapse would be self-propagating. ...

All correct - and these orders of magnitude for pressure and velocity are necessary to shatter the steel - isn't that right?Oystein, explosive use in controlled demolition generally shatters the steel with a hypersonic shockwave of gas which in reality is a very high pressure which produces a high gas velocity. RDX produces a pressure of about 3 million psi against the steel and has a propagation velocity of about 27,000 ft/sec., which is about 18,000 mph.
So we agree - there is no evidence for high explosives like RDX in those expulsions.The reason I say demolition devices is that some might try to say explosives have to be things like RDX and that isn't true.
See my signature.There are composite charges that could have done the job. Nano-thermite would produce high heat and fairly high pressure to do the job, while RDX would use extremely high pressure alone.
No.The blowouts at the spandrel connections could easily be from a composite charge.
No. Nonsense. Again, thermodynamics is your worst enemy!The use of a form of thermite would have caused molten metal in the rubble of the three collapsed buildings.
Thanks....
There is information on the Internet about composites if you are interested. Here are a couple of links http://www2.cnrs.fr/en/1926.htm and https://books.google.com/books?id=s...LTAC#v=onepage&q=composite explosives&f=false
I know.Something else you should know is that the velocity of an explosive decays as a function of the square of the distance.
All correct - and these orders of magnitude for pressure and velocity are necessary to shatter the steel - isn't that right?

Do you mean in the core of the "building designed to withstand plane impacts"? How many columns are required to be cut, and how loud would be the simultaneous explosions?The first story may have needed columns cut in the core, but after that is falling just removing joints works to eliminate structural integrity.
Urrrr - CC, but I am still right, and not wrong, that supersonic velocity (shockwave) and extremely high pressure, as results so much better from a shockwave, are necessary to crack the steel - whatever the precise mechanism on the atom scale?
Additionally, to take down the Twin Towers it wouldn't be necessary to be artificially removing structural integrity all the way down the building, as at some point the falling debris is enough to cause overload. Something like ten to twenty stories would work and after that the collapse would be self-propagating.
The first story may have needed columns cut in the core, but after that is falling just removing joints works to eliminate structural integrity.
Additionally, to take down the Twin Towers it wouldn't be necessary to be artificially removing structural integrity all the way down the building, as at some point the falling debris is enough to cause overload. Something like ten to twenty stories would work and after that the collapse would be self-propagating.
Both sections are going to be... um... demolished at the same rate. So by the time you've crushed up 15 stories below it, the top 15 stories are also going to be crushed. So there is nothing left now to crush the rest of the building.
To repeat: if RB-12+ had fallen as a rigid block, there would be impact, and the impact would
have caused abrupt interference with the fall of its upper part, including the roof. No such
interruption has occurred, and therefore no such impact has taken place. Evidently, the violent
destruction that occurred--presumably through planted explosives or other means of demolition--
effectively destroyed the structural integrity of the lower part of the upper block as well as DS-6,
permitting the upper block to fall at speed while meeting minimal resistance and experiencing
neither major impact nor abrupt deceleration.
But Tony, we would need to see this happening to all floors (or however many you seem to think are required to continue the collapse) on all corners, not just a one off event.No, one has to speak about the details of what makes a situation chaotic or uniform and orderly.
Your comments about chaotic involves your opinion that column ends would be uneven and I say that type of collapse occurring naturally, as you want to believe, would take much more time to occur. With demolition devices the columns can be cut at the same level and maintain an even, ordered, and rapid horizontally propagating collapse, such as what is observed. The instantaneousness of the charge is not the consideration and hence why I say your understanding of the subject is skewed.