08-08-2013, 05:40 PM
Tony Szamboti Wrote:So now you want to say a vertical drop of the core caused a large side to side motion that fractured perimeter connections. How did the core drop and why would it cause a large horizontal motion?
If I may interject the South Tower experienced a massive force impacting it in the form of the fuel tonnage contained in the left wing of Flight 175. This mass was transferred through the structure by the sheer momentum of the impact. This is evidenced by the mass exiting the opposite side of the building. While the inner column is designed for vertical strength it is not designed for such a crippling lateral force. The right side of the core and right side of the tower were weakened to the point of eventual structural collapse. The core probably collapsed because the unsupported void of the floor pads was enough of a weakness to cause progressive lateral stress on the core frame beyond its design tolerance.
Tony Szamboti Wrote:Additionally, if the perimeter connections were so susceptible to horizontal motion the wind resistance of the design would not have been nearly what the designers purported it to be.
We're not talking wind here we're talking the massive force of the collapse of the top section along with all the other particular lateral dynamics associated with floor pad collapse.
Tony Szamboti Wrote:The chief engineer John Skilling is on record explaining to authors Glanz and Lipton
The Vierendeel trusses would be so effective, according to the engineers' calculations, that all the columns on one side of a tower could be cut, as well as the two corners and several columns on the adjacent sides, and the tower would still be strong enough to withstand a 100-mile-per-hour wind. --City in the Sky, p 133
He forgot the wind-fanned fire. Something was creating the smoke being blown from the Towers and red hot molten metal seen in the videos. That steel had to be above 250 degrees. Again, you can only reference the particular conditions existing in the damaged section at the time. Intact building specs and wind resistance are not really relevant since they are too far removed from the actual conditions in the damaged towers as they burned.