QUOTE (lunk @ Aug 6 2010, 11:16 AM)
Excellent link, lunk. The videos were good, too. Seriously, I watched the 1st part a second time, mostly for the music.
More to the point, I think this FEA graphic work confirms that section in Ross' 2006 analysis "How the Towers were Demolished" dealing with the bowing columns, with the exception that Ross points out that bowing was visible on only one side each of WTC 1&2, and only at the mid wall sections, where floor trusses connected to the outer wall from the core columns, and not the corners. Whereas at the end of the 2nd video he seems to be showing the entire core dropping down, which would imply bowing on all 4 sides instead of just one.http://gordonssite.tripod.com/id2.html
"Perimeter column bowing
Note that the bowing identified by Nist was only on one side of each tower. It was not generalised across all of the tower.
For the example of WTC1, Nist report bowing only on the South face, storeys 94 - 100. For WTC2 bowing only on the East face, storeys 77 - 83.
Note that for both Towers only the MID-WALL perimeter columns were bowed.The corners were not visibly bowed.
If the bowing was being caused by a pure vertical movement of the upper core structure, that is with no tilt, the bowing would be present on all four sides.
However if a 45 degree cut is made in the core columns, there will also be a horizontal component to the movement of the bottom of the upper core section and a consequent tilt in the upper core section.
The floors will only transmit an inward pulling action through the floors to one wall, with a compressive action on the opposite floors and a twisting action on the floors on the adjacent sides.
It was the reaction created by a, say, 45 degree cut through the core columns which began, both the tilting action of the upper sections, and the bowing of one perimeter wall in each Tower.
Note the important point mentioned above that the design of the towers was such that the floor trusses connected outwards to connect directly only with the mid wall perimeter columns. The relevance of this is that the core pulling downwards would act effectively only through the floors to a proportion of the perimeter columns - those in the middle of each wall inside the lines of the core. The corners which were the strongest section of the perimeter structure were not placed directly under this load.
Further doubt is thrown on the Nist theory that the bowing was caused by sagging floors by examination of the photographs contained in their own report on WTC2, which shows floors sagging in a direction perpendicular to that which would be required to cause the bowing.
If the bowing was caused as Nist describe, then that would require that the floors are still connected to the East perimeter wall columns in order to pull them in, but the report shows disassociation of many of these connections. Those floor areas could not both be disconnected and contribute to a pulling action. This reduction in the number of floor to column connections would severely limit the total load which could be applied
Note also that while there is evidence in their report to show sagging did take place perpendicular to the direction required, there is no evidence presented that any sagging took place actually in the direction required."
The idea that the core columns were attaked first to weaken the towers is supported by Jim Gartenburg's phone call from the 86th floor of WTC1 to the ABC news affiliate, discussed here: http://pilotsfor911truth.org/forum/index.php?showtopic=14700
Lastly, Beethoven's 5th? I'm no authority on classical music, and I'm sure someone more knowledgeable will correct me, but that piece with the 1st video (though Idon't remember hearing it before) reminded me more of the 7th Symphony. The 5th is the one that starts out with what sounds like Death knocking on your door; dom dom dom DOM, dom dom dom Dom.
For example, here's a link to the 2nd movement of the 7th. It's not the same as the video, buts sounds more like a part of the same symphony (to me at least): http://www.youtube.com/watch?v=5V5k0Plh-jY
(warning - visual distraction. music accompanied by photo essay of Scarlett Johansson)
Anyway, good link. I'm sure I'll be using it sometime.