11-08-2013, 09:28 AM
[quote=Lauren Johnson][QUOTE]
Tony, you said the initiation of a ROOSD would require five floors of core columns and their support structure to vanish to provide the sufficient force. I believe Jeffrey, said it would require only one floor.
[/QUOTE]
I said that a twin tower floor could support perhaps an additional one or two floors applied as a static load. I think as a dynmic load the applied forced could be 10x or more than a static load and so this may be able to fracture the floor this came down on and kick off the ROOSD process or prgressive unstopppable floor collapse.
Albert's point is that the move of the antenna strongly suggests that the entire core area may have come undone and the ALL the floors bove 98 were free and falling... inside the facade and the 12 story facade was pulled downward by those 12 floors as rhey came free from the core and were plunging down. Unfortunately we can see inside past the facade and have to use the movements telegraphed through it and to it. There defintely was subtle movement of the top which suggests the frame was under extreme stress and experiencing individual and aggregate column strength loss before the visible release and downward motion of the facade and the flash over and expulsion of material.
Tony, you said the initiation of a ROOSD would require five floors of core columns and their support structure to vanish to provide the sufficient force. I believe Jeffrey, said it would require only one floor.
[/QUOTE]
I said that a twin tower floor could support perhaps an additional one or two floors applied as a static load. I think as a dynmic load the applied forced could be 10x or more than a static load and so this may be able to fracture the floor this came down on and kick off the ROOSD process or prgressive unstopppable floor collapse.
Albert's point is that the move of the antenna strongly suggests that the entire core area may have come undone and the ALL the floors bove 98 were free and falling... inside the facade and the 12 story facade was pulled downward by those 12 floors as rhey came free from the core and were plunging down. Unfortunately we can see inside past the facade and have to use the movements telegraphed through it and to it. There defintely was subtle movement of the top which suggests the frame was under extreme stress and experiencing individual and aggregate column strength loss before the visible release and downward motion of the facade and the flash over and expulsion of material.