Sir,
I'm not sure what kind of logic you're trying to use...but, the floors came down from the top...so each of the "collapsing" floors didn't have the entire weight of the building bearing down on them. As I have stated...on one of the collapses we can clearly see the top floors above the impact points...completely topple over to the side...just after the collapse had begin...so at this point....each floor that we see exploding/collapsing - is basically the TOP floor of the structure at the time of its pulverization.
There is NO weight bearing down on them....it's like the top floor keeps disappearing...one by one...that's why I said it didn't really collapse...the floors are actually exploding in a downward sequence...and that's why the building can and DID "fall" faster than the speed of free fall or gravity...because actually...nothing is collapsing or falling really (besides the remains of the explosions) The floors are just being pulverized in a downward sequence that creates the illusion that the floors are collapsing down upon one another. Yes, it's like a CD, that no one has ever seen...because I MEAN...look at the mess it caused...no one would ever CD a steel-structure building that tall...and that's why they had to use a different technique...as oppose to WTC 7, which was a more classic CD.
Sir,
If the collapse was a controlled demolition why were the exterior columns gradually bowing and buckling prior to the collapse, clearly visible on the photographs of the tower? Doesn't this indicate that the collapse was a gradual process as the fire took hold? Then as the weight of the structure above the weakened area (plane impact zone) exceeded the strain energy capacity in the deforming structural members the global collapse started.
Also when you look at the collapse of WTC 1 & 2 (together) and do the math both towers collapsed at the correct time based on the impact point of the plane and the weight of the structure above the weakened area.
The towers weighed about 500,000 tons each and the first plane hit between the 94th and 98th floors. So a conservative estimate at the weight of floors above the weakened area is...
((500,000 / 110) * (110 - 98)) = 54,545.45 tons
The second plane hit between the 78th and 84th floors. So again a conservative estimate at the weight of floors above the weakened area is...
((500,000 / 110) * (110 - 84)) = 118,181.82 tons
Obviously I'm assuming the weight was distributed evenly but it doesn't really matter because I'm using the same calculations for both buildings and I'm also being conservative with my estimates.
So now we have an estimate of the weight above the weakened area it makes sense why the second tower hit collapsed first because the weakened area had to bear more than twice the weight of the weakened area on the first tower hit.
In fact the first tower collapsed 103mins after the plane hit and the second tower collapsed 58mins after the plane hit. The first tower that was hit by Flight 11 lasted almost twice as long as the second tower hit by Flight 175 before it collapsed.
Obviously there are a thousand other variables that contributed to the length of time each tower withstood the fire after the plane impact. For example the fuel load of each plane as it hit the tower, speed and angle of impact, how much fireproofing was compromised by the impact etc but the weight above the weakened area, in my opinion, was the biggest factor.
Once we have an estimate of the weight above the weakened area that fell, when the structure failed, it is then easy using Newtonian physics to show that the forces involved in the collapse were immense and way and above anything anyone has seen before.
Knowing this it's impossible to compare the WTC collapse to other high rise fires especially when you don't consider the differences in building size and design, and also don't consider the structural damage and compromised fireproofing caused by the plane impact, something CT'ers often do.
