WTC Twin Towers Collapse Dynamics
The complete collapse mechanics of each tower can be written as a combination of two types of motion.
1) Uneven ROOSD
2) Dropping of 4 perimeter walls
ROOSD is described in the
OOS Propagation Model
A simple way to understand the motion of the outside walls: 2 skyscrapers with 4 walls each, giving us 8 separate walls. Each wall is identical to any other, so a general perimeter model of a single wall is introduced and then compared to each of the 8 walls separately.
A general single wall model demonstrating the basic movements observed is linked below:
Single wall model
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Some important principles of how walls fall:
1) The MER belts (fls 74-78, fls 40-44) play a crucial role in how a wall falls. They cause walls to fall in discrete stages. Walls can peel as single units between MER levels or they can fracture and fall very close to the base of the building, depending on the condition of the MER belt.
2) Uneven ROOSD can cause a wall to twist as it is shed from the building.
3) DIfferent walls drop in different ways depending on these basic observable principles
The 2 most extreme cases are
WTC1 west face (long) and
WTC2 south face (short). The WTC1 west face fell out as a curving 50 floor sheet, falling long and out from the base of the building. The WTC2 south wall fell as fragmented pieces and angled sheets, an 80 floor perimeter fitting into a very small space up to the base of the building across the street.
WTC 1: Recorded Motion of the Perimeter Walls
West Wall
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South Wall
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North Wall
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WTC 2: Recorded Motion of the Perimeter Walls
East Wall
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West Wall
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South Wall
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Follow-up discussion
here
Created on 04/19/2011 03:32 PM by admin
Updated on 09/18/2011 08:17 AM by admin
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