11-08-2013, 02:43 AM
Lauren Johnson Wrote:Assume that for some unknown reason, every one of the core columns of WTC 1 or 2 vanished in x number of floors. (Of course, we assume that they are still standing.) This eliminates the speculation about how many core columns remain and how strong they are.
If the core columns of one floor are removed what happens? Two? Three?
I assume, Jeffrey, you would say the whole building comes down with the removal of the core columns of even one floor. Correct. Tony, I am guessing you will say that the whole building does not collapse with the removal of only one floor's worth of core columns.
The perimeter would be pulled inward and fail causing the upper section to descend and impact the next story down and arrest. A one or two story fall does not produce enough kinetic energy to continue the collapse as it is significantly less than the column energy absorption.
Jeffrey thinks his ROOSD can begin right away but it can't as the floors could take 29 million lbs. of force, which is a static load of about five additional full floors with their live load. The dynamic load of one floor assembly would be nowhere near 5g's so ROOSD needs to wait until a sufficient number of floors have broken loose and gained momentum.