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Nist Hypothesis = Swiss Cheese, Errors and omissions

chris sarns
post Feb 7 2008, 04:14 AM
Post #1





Group: Private Forum Pilot
Posts: 203
Joined: 11-November 06
Member No.: 223



This is a work in process. Comments and criticism welcome.


Flaw in NIST hypothesis, Heat

http://wtc.nist.gov/progress_report_june04/appendixl.pdf

L-38 [42 on pg counter]
I4.2 Unbraced Columns: If floor systems failed, one or more columns may have lost lateral bracing.
At a floor where fires were noted, interior columns were comprised of W14x730 cores and reinforcing plates,
and could support several stories unbraced without failure. …… This column, ….. would be approaching its load carrying capacity for an unsupported length of four stories if it was also subject to a uniform temperature of 500 °C.

L-44
I4.6 uniform steel temperatures of approximately 570 Ί C [1058Ί F] would result in column failure.

1] Core columns 79, 80 and 81 weighed over 4 tons per floor.

2] Core columns were 2 stories high and the splices were about 3 feet above the odd numbered floors.
For a core column to fail at 3 splice joints, floors 8, 9 and 10, or floors 10, 11 and 12 would have to fail.
The girders between the columns would also have to fail.

3] There were fires on floors 8, 11, 12 and 13, at different times in the area where the collapse began.





Fire time line:
NIST L 22–26
11:30 a.m. to 2:30 p.m.: fire on floor 22 on south side
fire on floor 12 burned west to east across the south side
[there were no other fires reported in the east half of the south side]
2:00 to 2:30 p.m.: fires on floors 11 and 12 at SE corner, progressing north
http://img262.imageshack.us/img262/7555/e40rv.jpg

About 3:00 p.m., fires on floors 7 and 12 near the center of the north face
The fire on floor 12 spread in both directions, eventually reaching the NE corner
http://img54.imageshack.us/img54/346/11kp0.jpg
http://img410.imageshack.us/img410/3849/co...orthfacekj6.png

Sometime later, fires on floors 8 and 13
Fire on floor 8 eventually burned to NE corner and moved to east face
http://img165.imageshack.us/img165/337/copyof3kt0.jpg

Around 4:45 p.m., a photograph showed fires floors 7, 8, 9 and 11 near the middle of the north face. The fire on floor 12 had burned out by this time.
[NIST did not publish this photo]



Flaw in NIST hypothesis, Frame

L-48 [52 on pg counter]
H1.2 Floors 5 and 7: Floors 5 and 7 were thicker and more heavily reinforced than the typical floor systems, and may have been subjected to a large debris load from a vertical collapse within one or more bays.

L-50
H1.4 Truss #2 and/or East Transfer Girder: If one of the diagonals of truss # 2 and/or the east transfer girder was damaged or severed by collapse debris from the vertical progression, there would be a horizontal force developed in the Floor 7 slab as columns 77 and 78 became unstable.
• 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 possible result is a failure of all the columns at their splices, as shown in Fig. L–49.

1] Truss #2 was between floors 5 and 7 and supported column 77, which supported 40 floors.
It was many times stronger that the floor beams and girders on floor 7.
The floor beams and girders would fail first.
The floor 7 slab would have to collapse before debris could damage truss # 2 and/or the east transfer girder.
There could then be no build up of debris on floor 7 and therefore, very little horizontal force.

2] Figure L-49 does not include columns 62 and 80, or half of Truss #2.
Column 62 was surrounded with a reinforced slab.
Column 80 would have to buckle in 2 places and break at the splice near floor 3 for Truss #2 to collapse.
There were NO fires in this area.

3] They offer no explanation of how the rest of the core columns failed.













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shoon
post Feb 8 2008, 04:30 PM
Post #2





Group: Private Forum Pilot
Posts: 202
Joined: 22-October 06
Member No.: 126



Whatever! angry.gif
How would they explain about foreknowledge of collapse?
It seems to me this explanation just cause conflicts.
Controlled demolition theory covers all.
It is easy to explain when sun is center instead of earth being center.
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chris sarns
post Feb 21 2008, 08:04 AM
Post #3





Group: Private Forum Pilot
Posts: 203
Joined: 11-November 06
Member No.: 223



No horizontal collapse
Revised 2-13-08
Short version

NIST horizontal collapse hypothesis:
H1.4: ….. a horizontal force developed in the Floor 7 slab
The horizontal tensile force would tend to pull the line of columns 74, 71, 68, 65, and 62 towards the east
… simultaneous lateral displacement of the center core columns
… possible result is a failure of all the columns at their splices
, as shown in Fig. L–49.
[column 62 not shown]



NIST is saying that the floor 7 slab between columns 77 and 74 pulled 5 core columns sideways simultaneously.

The girder between columns 77 and 74 held the slab to column 74.
It is not strong enough to bend column 74 and break 2 splice joints, much less pull 5 columns sideways.


They offer NO explanation as to how the rest of the core columns failed.
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chris sarns
post Feb 21 2008, 08:10 AM
Post #4





Group: Private Forum Pilot
Posts: 203
Joined: 11-November 06
Member No.: 223



Revised 2-13-08

No horizontal collapse

NIST horizontal collapse hypothesis:

H1.4 Truss #2 and/or East Transfer Girder: If one of the diagonals of truss # 2 and/or the east transfer girder was damaged or severed by collapse debris from the vertical progression, there would be
a horizontal force developed in the Floor 7 slab as columns 77 and 78 became unstable.

• 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.

• 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. [column 62 not shown]



NIST is saying that the floor 7 slab between columns 77 and 74 pulled 5 core columns sideways simultaneously.
For this to happen, all the following must occur simultaneously:

Column 74 BENDS below floor 5 and breaks at 2 splice joints.
The other 4 columns break at 3 splice joints.
Four girder to column connections on the west side of column 62 fail
while the 24 intervening beam to column connections hold.
[62 was surrounded by an 8 inch thick, reinforced* concrete slab on floor 7]
36 north south, girders bend and start to break at column connection.
Sixteen 10 foot wide, reinforced concrete slabs, rip apart.**

The hypothesis assumes column 80 failed and falling debris took out the east half of T2.
Therefore, the floor 7 slab between columns 80 and 77 is no longer there.
That leaves the slab between columns 77 and 74, to pull 5 core columns sideways.
Part of that area was the stairwell and a service shaft.
The girder between columns 77 and 74 was holding the slab to column 74.
It is not strong enough to bend column 74 and break 2 splice joints, much less pull 5 columns sideways.

http://img403.imageshack.us/img403/9323/fl7efo3.png


They offer NO explanation as to how the rest of the core columns failed.


* two layers of 5/8” steel rebar, 6”apart, in both directions.
**slab noted above and 15, 5 1/2" slabs with one layer of 6”x 6” W1.4 [5/8”] welded wire.

Source:
http://wtc.nist.gov/progress_report_june04/appendixl.pdf
http://www.fema.gov/pdf/library/fema403_ch5.pdf
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chris sarns
post Feb 21 2008, 08:15 AM
Post #5





Group: Private Forum Pilot
Posts: 203
Joined: 11-November 06
Member No.: 223



Revised 2-16-08

Flaw in NIST hypothesis, Heat

http://wtc.nist.gov/progress_report_.....;/appendixl.pdf

L-38 [42 on pg counter]
I4.2 Unbraced Columns: If floor systems failed, one or more columns may have lost lateral bracing.
At a floor where fires were noted, interior columns were comprised of W14x730 cores and reinforcing plates, and could support several stories unbraced without failure. …… This column, ….. would be approaching its load carrying capacity for an unsupported length of four stories if it was also subject to a uniform temperature of 500° C.

L-44
I4.6 uniform steel temperatures of approximately 570Ί C [1058Ί F] would result in column failure.

1] Core columns 79, 80 and 81 weighed over 7 tons per floor.

2] Core columns were 2 stories high and the splices were about 3 feet above the odd numbered floors.
For a core column to fail at 3 splice joints, floors 8, 9 and 10, or floors 10, 11 and 12, would have to collapse.

3] There were fires on floors 8, 11, 12 and 13, at different times in the area where the collapse began.

These fires were not sufficient to heat a column weighing over 7 tons per floor to 1058Ί F on 4 contiguous floors.


Fire time line:
NIST L 22–26
11:30 a.m. to 2:30 p.m.: fire on floor 22 on south side
fire on floor 12 burned west to east across the south side
[there were no other fires reported in the east half of the south side]

2:00 to 2:30 p.m.: fires on floors 11 and 12 at SE corner, progressing north



About 3:00 p.m., fires on floors 7 and 12 near the center of the north face
The fire on floor 12 spread in both directions, eventually reaching the NE corner



Sometime later, fires on floors 8 and 13
Fire on floor 8 eventually burned to NE corner and moved to east face



Around 4:45 p.m., a photograph showed fires floors 7, 8*, 9 and 11 near the middle of the north face. The fire on floor 12 had burned out by this time.
[NIST did not publish this photo]
*fire on floor 8 had already burned that area out.
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ULTIMA1
post Oct 10 2008, 03:28 PM
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Group: Student Forum Pilot
Posts: 52
Joined: 17-January 07
From: PA
Member No.: 464



QUOTE (Turbofan @ Mar 17 2008, 04:12 PM) *
Any news on NIST's report for WTC#7? I heard it was due out this month. Nothing on the NIST site (which doesn't surprise me thumbdown.gif )



Well first off, how can NIST come out with a proper report when they failed to recover any steel for testing?
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