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NIST Replies to Stiffeners Inquiry
Posted by kawika on Wed, 11/06/2013 - 5:30pm
I am pleased to offer the following email from
Public Affairs Officer Michael Newman, dated 25 OCT 2013. The inquiry
actually began in March 2012 immediately following our discovery of the
stiffeners on girder A2001. Despite what the answer says, I made my
inquiry on 26 JUL 2013 and followed up on 24 SEP. No reply was received
so I sent a final letter on 19 OCT.
Background on this inquiry can be found here:
http://911blogger.com/news/2013-09-25/60-days-nist-refuses-reply
************************************************************************************
From: michael.newman@nist.gov
CC: wtc@nist.gov
Subject: RE: WTC7 Report Discrepancies
Date: Fri, 25 Oct 2013 12:55:28 +0000
Dear Mr. Cole,
Following your e-mail of September 24 (see below), a set of responses to your questions were prepared. Unfortunately, the partial shutdown of the federal government delayed our getting these responses to you. With our apologies for tardiness, here are those responses:
A) In NCSTAR 1-9, which design drawing was used to create:
Figure 8-21?.................1091, 9114
Figure 8-23?.................1091, 3004, 9114
Figure 8-26?.................1091, 3004, 9114
Figure 8-27?.................E12-13
Figure 11-16?...............E12-13, E120
Figure 11-19?...............None
Figure 12-24?..............1091, 9114
Figure 12-25?..............1091, 9114, E12-13
B) Given that Frankel drawing #9114 shows 3/4" web/flange stiffeners installed on the girder at the 13th floor column 79 connection, why weren't the stiffeners reported in NCSTAR 1-9 and shown in the figures listed above? Was Frankel Drawing #9114 used? If not, why not?
The web stiffeners shown at the end of the girder in Frankel drawing #9114 prevent web crippling. The structural analyses of WTC 7 did not show any web crippling failures. Therefore, the web crippling plates did not need to be included in the models/analyses.
Again, we apologize for the length of time it took to get this information back to you.
Thank you for your interest in the NIST World Trade Center investigation.
Sincerely,
Michael Newman
NIST Public Affairs Office
Background on this inquiry can be found here:
http://911blogger.com/news/2013-09-25/60-days-nist-refuses-reply
************************************************************************************
From: michael.newman@nist.gov
CC: wtc@nist.gov
Subject: RE: WTC7 Report Discrepancies
Date: Fri, 25 Oct 2013 12:55:28 +0000
Dear Mr. Cole,
Following your e-mail of September 24 (see below), a set of responses to your questions were prepared. Unfortunately, the partial shutdown of the federal government delayed our getting these responses to you. With our apologies for tardiness, here are those responses:
A) In NCSTAR 1-9, which design drawing was used to create:
Figure 8-21?.................1091, 9114
Figure 8-23?.................1091, 3004, 9114
Figure 8-26?.................1091, 3004, 9114
Figure 8-27?.................E12-13
Figure 11-16?...............E12-13, E120
Figure 11-19?...............None
Figure 12-24?..............1091, 9114
Figure 12-25?..............1091, 9114, E12-13
B) Given that Frankel drawing #9114 shows 3/4" web/flange stiffeners installed on the girder at the 13th floor column 79 connection, why weren't the stiffeners reported in NCSTAR 1-9 and shown in the figures listed above? Was Frankel Drawing #9114 used? If not, why not?
The web stiffeners shown at the end of the girder in Frankel drawing #9114 prevent web crippling. The structural analyses of WTC 7 did not show any web crippling failures. Therefore, the web crippling plates did not need to be included in the models/analyses.
Again, we apologize for the length of time it took to get this information back to you.
Thank you for your interest in the NIST World Trade Center investigation.
Sincerely,
Michael Newman
NIST Public Affairs Office
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