10-08-2013, 02:54 PM
Tony wrote that the core suffered no damage in the North Tower. I think he edited it since then. If you look at the videos, Flight 11 created fiery outshoot out the opposite side of the impact zone. Since it struck close to the center of the tower you can assume the mass that shot out through the opposite side traveled through a substantial portion of the inner core and caused serious damage to a good percentage of the supporting columns whose load was redistributed to the outer frame. It was Tony himself who said the core was designed to support 4 times overload. The percentage of remaining columns were doing exactly that up until they became too weak and suffered failure creep.