Photo archive of debris in the area east of WTC 2 here
1) The spandrels along the blue lines pull inward and downward. The upper large standard sheet is pulled behind the red sheet, breaking along the upper edge of the large MER stiffening plate (green belt). The upper edge is marked in purple.
2) The red middle sheet falls outward, breaking at the base just above the 41-43 MER panels and fall down over 40 fls to earth leaving the purple lower sheet standing. It also breaks along the upper edge of the 41-43 MER stiffenig belt (purple line).
3) The lower sheet then falls outward and was found lying practically interconnected from the base of the footprint to the 44th fl.
4) The stiff NE corner breaks along the 3 red marks. No info on SE corner breaks.
5) The top of the tower pinched inward just under the hat truss and top MER stiffener as it was leaning (as shown).
The upper sheet falls completely behind the middle sheet:
There is evidence that the east facade of WTC 2 from the 80th floor downwards fell as an interconnected single sheet of unbuckled perimeter column sections. The spandrel plate connections and column-to-column bolt connections remained largely intact until far into its fall.
Here is a glimpse of the sheet falling away from the building:
which fits the pattern of the lowest bolted connections shown above with the addition of 2 more panels shown in red:
Note the middle sheet falling away from the building. the upper MER level (fl 43) is morked in red.
The middle3 sheet will emerge from the building dust moments later as seen in the video below.
The middle perimeter from fls 78 to 44 is seen emerging from the bottom of the bulging dust in this video:
Wide MER spandrels for fls 41-43 north half marked in red. Wide MER spanrels for south half marked in green.
This is the debris as it looked just after 9-11-01. The large MER sections sit at the very end of what appears to be a large, rolled-out sheet of perimeter wall. It is, in fact, the entire east side of WTC2 from the 41-43 fl MER level downward., about 60 columns wide (57 to be exact, excluding the cornermost sections).
A view from the side. The MER panels marked in green are along the bottom of the photograph.
Blue lines mark the wide spandrels from the lowest MER level above ground level. The red and blue boxes mark where the right and left halves of the 41-43 MER perimeter were found.
Other wide MER spandrels are marked.
Clean-up operations have already cleared debris in the lower left corner of the photo but the size of the intact east side of the building is obvious.
Even from the debris we can see that the spandrels split along the NE and SE corners of the building yet remained relatively intact between the corners.
Note the identical break line relative to the wide MER spandrels that was seen above the 75-77 MER failure line.
There is only one unique place it can fit in the graphic: It is the entire right half of the perimeter wall. The broken spandrels on the right must be one perimeter panel (3 columns) in from the northeast corner of the building.
The piece next to a street sign:
And where is the intersection of Church and Cortlandt? In the red oval below.
We can see the entire east face of WTC2 below floor 81 "peeled" away from the building, falling over WTC4, its top edge (the mechanical room sheets) landing along Church Street.
TOWARD AN ACCURATE TECHNICAL HISTORY OF THE WTC2 COLLAPSE
WTC2 BUILDING MOVEMENT: INDEPENDENT MAPPING AND MEASUREMENTS OF THE EARLIEST DETECTABLE MOVEMENT THROUGH THE COLLAPSE INITIATION SEQUENCE
The collective visual record of the WTC2 collapse is examined directly and independently of all other sources, groups or individuals. The movement of the structure during the initial column failure sequence is mapped and traced back to the earliest point of detectable movement from multiple angles. Features of the initial failure sequence can be understood as a rapid succession of 8 identifiable events occurring in the following order:
1) Deformations: Inward bowing of the east face
2) Earliest detectable movement: 81, 82nd fl spandrels pull in sharply (along east and north walls)......................
3) Earliest ejections, 78th fl ejections: .....................
4) East wall separates into upper and lower parts, East wall upper portion is pulled inward and behind the lower portion
5) Tilting begins
Flash and destruction of NE corner, floor 90
Failure sequence of the north and south perimeter walls over tilt of __ degrees
6) 75th fl east face row of ejections
7) 75th fl west wall north and south quarter of MER panels ejected from building with flooring still attached. NW and SW MER corners are destroyed, west wall upper portion falls out and over lower portion. Release and fall of upper portion. Tilting levels out.
8) Dropping of the upper portion
All claims are verifiable and all methods reproducible.
Like WTC1, inward bowing was observed on the perimeter wall connected to long span floor trusses. In the case of WTC1, inward bowing on the south face led to collective core collapse at a tilt angle of less than 1 degree about 20 minutes after it was first observed. The actual tilt angle was grossly exaggerated within the NIST reports, and upon this gross exaggeration the NIST concluded that south wall failure triggered collective core failure over a tilt of at least 8 degrees. If one uses correct observations and measurements as opposed to the grossly misrepresented ones offered by the NIST, it is natural to suspect that the south wall failure was a reaction to core failure rather than the other way around.
2) EARLIEST DETECTABLE MOVEMENT: 81, 82nd fl spandrels pull in sharply (along green and blue lines)
The NIST does not mention within their reports or seem to notice how the the north wall is pulled in along with the east wall. Just as in the case of WTC1 and WTC7, the motion indicates that the perimeter seems to be responding to failure within the core.
In all 3 collapsed buildings, the NIST does not acknowledge that the perimeter deformation is a response to partial or collective core action.
There is no need to speculate about these events since they are directly observable and captured in video and photographs, and therefore verifiable.
It is interesting to ask how many of these distinct observable features were spotted and noted in the NIST report on the WTC1 collapse. Of all the observations and measurements listed, only the fire flair-up from the east side of the building 3 seconds before collapse is mentioned within the NIST reports.
COLLAPSE PROGRESSION REVISITED: ORDERED DECONSTRUCTION (DECOMPOSITION) OF THE LOWER PORTION
COLLAPSE PROGRESSION FRONTS are discussed in the next subsection.
Just as with WTC1, WTC2 experienced inward bowing of the perimeter leading up to collapse. The reason given for this, according to the NIST, is that the perimeter was pulled inward due to sagging long span floor trusses. As with WTC1, vital clues are overlooked within the NIST reports that are extractable directly from the visual record.
Anyone can look at the splitting of the perimeter walls of each building to clearly see that WTC1 behaves quite differently than WTC2.
Created on 05/18/2008 12:56 AM by admin
Updated on 06/16/2012 09:36 AM by admin