payne1000 wrote:
Nowhere in any of the convoluted impossible collapse scenarios you and your fellow anonymous shill, emarine, have posted have you given a valid explanation of how the center core could collapse upon itself. The center core was designed to support three times the weight it actually held up. It's totally impossible that it would collapse straight down on itself in less than 15 seconds from the same weight it had held up for half a century. The fake war on Muslims is still going on. That's why it's so important that all the world knows the truth.
Nowhere in any of the convoluted impossible collap... (
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Facilitated by the hat truss systems at the top of the towers, the core columns and the perimeter columns SHARED EQUALLY the gravity load of the towers. One without the other was not strong enough to bear the total load. (As Leslie Robertson clearly explained).
Moreover, there were FOUR strength levels in the tower support structure. Size and strength transitions occurred at four levels. IOW, the gravity load at the higher levels of the towers was less than that at the lower levels. For example, the gravity load at the 75th floor was one third what it was at the base, so the support columns at the 75th floor level were not as strong as those down below. The size, strength and type of core columns ranged from 22x22 inch box columns (1.3 inch steel), 14x22 box columns (5 inch steel), 14x15 inch box columns (1.5 inch steel), 22x17 inch Wide Flange columns (5 inch steel), 15x15 inch Wide Flange columns (1.5 inch steel), 10x13 Wide Flange columns (.64 inch steel).
The 10x13 Wide Flange columns (.64" steel) were predominant in the impact and fire zone in the North Tower (Floors 93 through 99), and transitions from 14x15 inch box columns (1.5 inch steel) to 10x13 Wide Flange columns (.64" steel) existed in floors 80 to 86 in the South Tower.
The jet impacts at floors 93 through 99 in the North Tower and floors 78 through 85 in the South Tower severed over 60 perimeter columns and damaged many others, this loss of support capability obviously caused a transfer of additional gravity loads onto the remaining columns. The impacts obliterated floor systems in the immediate impact areas, caused floor collapses in the heaviest hit areas and damaged other floors in both the core and in the office areas (floor system destruction was particularly severe in the South Tower due to the path of the jet through the building). The impacts blew away fire proofing on columns and trusses in the impact zone, caused floors to collapse as far as 8 floors below the impact zone, severed the water supply systems, disabled elevators, blocked stairwells, and killed a lot of people.
The fuel explosions ignited thousands of tons of combustibles in the office and core areas across 6 to 9 floors, the ensuing fires burned unchecked, out of control, long enough to critically weaken additional support columns in both the core and perimeter. Eventually, as we have seen, the entire support system in both towers failed in and around the impact/fire zones and the entire portion of the buildings above the failures collapsed onto the floors below. One floor at a time, in sequence, all the way down. A PROGRESSIVE GRAVITATIONAL COLLAPSE.
Impossible to imagine how you can put the whole gravitational load in the twin towers on the core columns alone. Must be a major glitch in your understanding of building engineering and the laws of physics. No doubt the massive conspiratorial brainwashing you have succumbed to caused a complete failure in whatever ability you may have had to apply logic, objective reasoning and critical thought to complex issues. You should try to regain some ability to think for yourself before your time runs out.