13-08-2013, 10:20 PM
Albert Doyle Wrote:Lauren Johnson Wrote:Tony said that if that happened, it would require the instantaneous disappearance of five floors to allow enough momentum to begin the cascading collapse.
I already explained Tony did not say that. If you read what he said, he said it would take the specific weight of 5 floors of the North Tower to break the threshold of static resistance below in the main structure. He even gave that specific weight.
When I explained that 12 floors fell, meaning a weight well above what he described was involved, Tony never gave a straight answer.
I said to cause a self-propagating collapse of the floors (meaning the floor slabs outside of the core as implied by ROOSD) would require at least five floors to fall on one floor before it could be self-sustaining. That can't happen in the beginning of the collapse and you can't dump the entire 12 story upper section on the floor slab as there are columns in the way in a natural collapse. Getting those five floor slabs would require the collapse of at least five stories of columns. Now there is a problem as the columns should have provided significant resistance. They did not and it appears they weren't even involved in resisting the collapse. Why not?
Of course, some like to say the columns would have missed each other. However, the upper section would not just shift over without an enormous lateral load on it. There is no lateral load on it as gravity is a vertical load, and the small tilt provides very little lateral load component.