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Baran Hines & Ralph Morelli

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#911Truth WTFact #5: Building 7
WTFRLY’s 9/11 Truth Top 50 WTFacts

Can you spot the difference?

That is the question generating the most discussion of new analysis in the 9/11 Truth community. For those that are less studied on the 9/11 “investigation”, the collapse of Building 7 remains a mystery, however many still think it’s “all junk” and has been “disproven” despite the clear lack of investigation.

As it relates to Building 7, National Institute of Standards and Technology ultimately produced a report which didn’t actually investigate the collapse in accordance with nationally recognized procedures, but simply did their supposed best to simulate various fire scenarios and agreed on the most likely outcome. That is not an adequate investigation and it has been passed off as if it is in order to stifle debate.
The diagrams above point out a key discrepancy in the report which until the middle of 2012, went unnoticed. A January 2012 Freedom of Information Act request, by a structural engineer working with Architects & Engineers for 911 Truth, yielded sets of original construction drawings that show a different version of what is represented in Figure 8-21.
Comparing the two diagrams above, the original drawings from Frankel Steel Limited point out the omission of a critical component called flange stiffeners, also called stiffener plates, from Figure 8-21 in the report.

via SteelConstruction.info
Definition of stiffeners: Stiffeners are secondary plates or sections which are attached to beam webs or flanges to stiffen them against out of plane deformations.

R19 Fig7.png

R19 Fig8.PNG

This is a significant discrepancy because the figure at issue illustrates the suggested reason for the failure of Column 79 which is cited as the initiation of the collapse sequence the NIST report claims is most likely responsible for the collapse of Building 7.

Via AE911truth.org
NIST finally released the structural and shop drawings in January 2012, pursuant to a FOIA request. They can be downloaded here:

WTC 7 Blueprints Exposed Via FOIA Request: Building Plans Allow for Deeper Analysis of Skyscraper’s Destruction

9/11 researcher David Cole went through the hundreds of drawings and found drawing 1091 which shows the girder seat was 12 inches wide (as noted above), not the 11 inches claimed in the final report. He also found drawing 9114, which shows flange stiffeners at the column 79 end of the girder between column 44 and 79.

NIST omitted these flange stiffeners that would have prevented the bottom flange from folding as required for their collapse to begin. The girder would have to be pushed almost all the way off the seat, not just half way, before the bottom flange would buckle.

“Walk-off failure of beams and girders was defined to occur when … the beam or girder was pushed laterally until its web was no longer supported by the bearing seat. … the beam was assumed to have lost support, as the flexural stiffness of the bottom flange was assumed to be insufficient for transferring the gravity loads.” NCSTAR 1-9 Vol. 2 p. 488 [pdf p. 150]

The flange stiffeners are on the Frankel drawings, but not on the NIST drawings in the final report.

Drawing 9114 clearly shows instructions for stiffener plates at the connection poorly represented by Figure 8-21 of the NIST report.

Can you spot the difference now?

Looking at the correct original Frankel drawings again after seeing Drawing 9114, it is patently obvious that the connection represented in Figure 8-21 of the NIST report is missing the plates. The reason this subtle difference escaped detection for so long is because to the untrained eye, it looks like nothing is missing. At a minimum, this omission, however it happened, is a serious oversight which leads to a significantly altered outcome as it relates to the fire simulations NIST generated.

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