WTC7 Horizontal collapse based on a false statement
NIST L-11
The 7th Floor slab consisted of 5 in. of 3,500 psi normal weight concrete on top of 3 in., 18 gage
composite metal deck, for a total thickness of 8 in. The slab was reinforced with #5 rebars at 6 in. oncenter
in both directions. Regions of the slab on the south side of the building had 8 in. of formed
concrete without any metal deck. In these regions two layers of steel reinforcing were provided (see
Fig. L–13).
NIST L-50
• H2.7 Collapse Progresses: The horizontal tensile force would tend to pull the line of
columns 74, 71, 68, 65, and 62 towards the east.
*The general absence of the Floor 7 slab*
and braced frames around the center core column line, due to the presence of elevators shafts,
creates a more likely scenario for the simultaneous lateral displacement of the center core
columns without similarly displacing other core columns. The possible result is a failure of
all the columns at their splices, as shown in Fig. L–49.
- Chris Sarns's blog
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Have you an internet link to "as shown in Fig. L–49."
John A MITCHELL
Herblay FRANCE
Bonjour ,
Have you an internet link to "as shown in Fig. L–49."
And to be quite truthfull I am not aware of the importance of the slab.
Thanks
John
Insipid piece of misleading dribble
Figure L-49 and the text I quoted is on pg L-50 [54 on pg counter]
http://wtc.nist.gov/progress_report_june04/appendixl.pdf
Figure L-13 , Floor 7 plan is on pg L-11
Floor plan of 8 to 45. [Same as floor 7]
http://img168.imageshack.us/img168/8526/wtc7fl8edit4pp2.png
The text lists columns 74, 71, 68, 65, and 62 but Figure L-49 does not include column 62 which is surrounded by a 8” slab with 2 layers of rebar.
The scenario ignores the girders connecting the center core columns to the north and south core columns, and the vertical framing necessary for the elevators.
Columns 74, 71, 68, 65, and 62 would have to rip away from all this framing or bring it along.
NIST acknowledges that:
H2.6 Collapse Does Not Progress: The Floor 7 slab may fail at adjacent columns prior to imposing lateral displacements sufficient to fail the columns or their splices.
Finally,
• H2.7 Collapse Progresses: The horizontal tensile force would tend to pull the line of columns 74, 71, 68, 65, and 62 towards the east. The general absence of the Floor 7 slab and braced frames around the center core column line, due to the presence of elevators shafts, creates a more likely scenario for the simultaneous lateral displacement of the center core columns
***without similarly displacing other core columns.***
Even if the center row of core columns were to fail in this manner, the building would not collapse.
They offer NO explanation as to how the rest of the core columns failed.
I didn't understand any of it
In any case, NIST will also have to explain
- how all the 80 or so columns were snapped at the same instant (resulting in a sudden vertical collapse)
- how the intact majority of the building didn't even slow down the collapse
- what partially melted this steel photographed by FEMA:
http://www.fema.gov/pdf/library/fema403_apc.pdf
- what caused the explosions in WTC 7 that can be heard at
http://www.youtube.com/watch?v=58h0LjdMry0
What can we do to prevent NIST from simply ignoring all of this?
NIST can no longer ignore the facts
Richard Gage laid out the facts and they are now part of the public record .
He ripped them a new one in a live teleconference
http://nasathermalimages.com/images/NIST_N...rd_Gage_AIA.mp3
and followed up with a letter to NIST
http://www.ae911truth.net/downloads/AE911Truth-NIST-Writ-Subm12-18-07.pdf
BTW: Thanks for convincing Richard to get rid of the 'squibs'.
That's been a bugaboo of mine for a long time.
thanks for the links and explanations.
John A MITCHELL
thanks for the links and explanations.