15-08-2013, 12:34 PM
Jeffrey Orling Wrote:Lauren,
Although I see no evidence for CD... I also think that because the design of the 3 towers they each had Achille's heels which did not have redundancy... such as the FEW massive transfer structures in 7 and the column free office space of the towers... and the fact that there were so few columns in the core supporting the floors outside the core. You don't have to destroy all the core... clearly the 23 columns in the center of the core had nothing do with carrying the outside the core floors. So with 24 doing this it's not a stretch even for a laymen to understand that one doesn't need to destroy ALL 24 to cause the floors to release... One or two or a few more at one level will not erode the reserve strength of the core causing the remaining columns to collapse... but with the effects of heat... the reserve strength of too many of them erodes and after a couple of hours it was all gone. If it was eroded further.. there was inadequate supprt. And that's what apparently happened.
To answer your question... it probably would take less than 12 of the right core columns since all were not equal and it would clearly depend on which ones were destroyed. Take out all 8 of one side.. 500s or the 1000s and the tower would go ROOSD. Or maybe 4 on each of the long sides.
Destroy one spliced connection in TT1 might get the entire structure to collapse. There... I said it.
One or two outer core columns at initiation would not have generated the extremely rapid horizontal propagation across the 98th floor that was observed. All 24 of them needed to go down nearly simultaneously, as the propagation from the southwest corner to the northeast corner of WTC 1 occurred in less than a second.
This is similar to your transfer truss notion producing free fall acceleration in WTC 7.
Neither situation is happening naturally due to fire.