Some Misunderstandings Related to WTC Collapse Analysis

[Tony Szamboti]

The entire core did come down inside and it pulled the perimeter inward causing the entire upper section to come down. The problem is how the entire core came down, not whether it did or not. Albert's logic is circular.

Tony,

Do think that the core was blown (CD) at the point of impact unleashing a cascading collapse the rest of the way? Or was it blown all the way down every three floors using cutter charges?

I think the core was initially blown at the 98th floor in the North Tower and then at least for the next several three story increments to generate enough momentum for the collapse to become self-propagating. The corners of the perimeters were also blown for this period and may have been cut for a much longer period to prevent orthogonal resistance and allow the exterior walls to petal outward.

It is also important to bear in mind that the initiation floor (the 98th) was above the aircraft impact damage, so impact damage could not have contributed to the initiation. The majority of the impact damage was to the north face and largely limited to the 94th through 96th floors.