NIST Status Update on World Trade Center 7 Investigation
FOR IMMEDIATE RELEASE:
June 29, 2007
CONTACT: Michael E. Newman
A team of scientists and engineers at the Commerce Department's National Institute of Standards and Technology (NIST) that is investigating the collapse of New York City's World Trade Center 7 (WTC 7) building expects to release its draft report for public comment by the end of the year. WTC 7 was a 47-story office building adjacent to the WTC towers (WTC 1 and 2) that collapsed following the terrorist attacks of Sept. 11, 2001. WTC 7 collapsed later that afternoon.
NIST's investigation of WTC 7 includes an extremely complex analysis that incorporates detailed information about the building's structure and construction, as well as data about fires, damage sustained from falling WTC 1 debris and other technical factors to determine its probable collapse sequence.
"We are proceeding as quickly as possible while rigorously testing and evaluating a wide range of scenarios to reach the most definitive conclusion possible," said Shyam Sunder, WTC lead investigator for NIST. "The WTC 7 investigation is in some respects just as challenging, if not more so, than the study of the towers. However, the current study does benefit greatly from the significant technological advances achieved and lessons learned from our work on the towers."
The NIST investigation team initially worked simultaneously on both the WTC towers and WTC 7 collapses. In June 2004, the team shifted to full-time study of the towers to develop needed simulation methods and other research tools and to expedite completion of the WTC towers report. Work resumed on the WTC 7 study in October 2005.
The current NIST working collapse hypothesis for WTC 7 is described in the June 2004 Progress Report on the Federal Building and Fire Safety Investigation of the World Trade Center Disaster (Volume 1, page 17, as well as Appendix L), as follows:
An initial local failure occurred at the lower floors (below floor 13) of the building due to fire and/or debris induced structural damage of a critical column (the initiating event) which supported a large span floor bay with an area of about 2,000 square feet;
Vertical progression of the initial local failure occurred up to the east penthouse, as the large floor bays were unable to redistribute the loads, bringing down the interior structure below the east penthouse; and
Horizontal progression of the failure across the lower floors (in the region of floors 5 and 7, that were much thicker than the rest of the floors), triggered by damage due to the vertical failure, resulting in a disproportionate collapse of the entire structure.
This hypothesis may be supported or modified, or new hypotheses may be developed, through the course of the continuing investigation. NIST also is considering whether hypothetical blast events could have played a role in initiating the collapse. While NIST has found no evidence of a blast or controlled demolition event, NIST would like to determine the magnitude of hypothetical blast scenarios that could have led to the structural failure of one or more critical elements.
Updated information with the specific date for the public release of the NIST team's draft report will be posted on the WTC investigation Web site, http://wtc.nist.gov.
NCST Advisory Committee Meeting, December 18, 2007
The National Construction Safety Team (NCST) Advisory Committee (Committee), National Institute of Standards and Technology (NIST), met via teleconference Tuesday, December 18, 2007, from 1 p.m. to 3 p.m.
The Federal Register Notice (announcing the meeting)
1:00 pm Welcome and Opening Remarks Paul Fitzgerald
1:05 pm Opening Remarks and Overview of WTC 7 Investigation (pdf) Dr. S. Shyam Sunder
1:20 pm WTC 7 Technical Approach and Status Summary (pdf) Therese McAllister
1:40 pm Discussion of WTC 7 Technical Approach and Status Summary All
1:50 pm NCST Advisory Committee Report To Congress All
2:25 pm Break
2:30 pm Public Comment Period
3:00 pm Adjourn
Final Meeting Minutes (pdf)
Written Public Comments
Mr. Richard Gage
Mr. Jerry Leaphart
1/08 Complete analysis of initiating event.
3/08 Complete analysis of global building response to initiating event.
4/08 Identify leading collapse hypothesis.
5/08 Complete draft reports for NIST Team review.
6/08 Revised draft reports transmitted for NIST level and NCST Advisory Committee Review.
7/08 Release draft reports for public comment.
8/08 Release final reports on WTC 7 Investigation.
Author(s): Gann, R. G.;
Title: Final Report on the Collapse of World Trade Center Building 7, Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1A)
Published: November 20, 2008
Abstract: This report describes how the fires that followed the impact of debris from the collapse of WTC 1 (the north tower) led to the collapse of WTC 7; an evaluation of the building evacuation and emergency response procedures; what procedures and practices were used in the design, construction, operation, and maintenance of the building; and areas in current building and fire codes, standards, and practices that warrant revision. Also in this report is a summary of how NIST reached its conclusions. NIST complemented in-house expertise with private sector technical experts; accumulated copious documents, photographs, and videos of the disaster; conducted first-person interviews of building occupants and emergency responders; analyzed the evacuation and emergency response operations in and around WTC 7; performed computer simulations of the behavior of WTC 7 on September 11, 2001; and combined the knowledge gained into a probable collapse sequence. The report concludes with a list of 13 recommendations for action in the areas of increased structural integrity, enhanced fire endurance of structures, new methods for fire resistant design of structures, enhanced active fire protection, improved emergency response, improved procedures and practices, and education and training. One of these is new; the other 12 are reiterated from the investigation into the collapse of the towers. Each of the 13 is relevant to WTC 7.
- Code: Select all
17,000+ New Pages Of NIST WTC Investigative Records
Submitted by Aidan Monaghan on Tue, 05/08/2012 - 2:34am
On April 3, 2012, the National Institute of Standards and Technology (NIST) released an additional 17,000+ pages of World Trade Center (WTC) records obtained by them from the Port Authority of New York and New Jersey, the New York City Department of Buildings and Turner Construction. The latest records are part of an ongoing NIST WTC records release. NIST has since advised that more records will follow.
(Download files here)
http://archive.org/details/NIST_FOIA_12 ... _Responses
http://911datasets.org/images/NIST_FOIA ... 12.torrent
http://911blogger.com/news/2012-05-08/1 ... ve-records
Spiro C. Thiery » Mon Jul 18, 2016 4:48 am wrote:I predict that one day the official admission will come that 7 was indeed a demolition controlled that was carried out to prevent the hazard of some or all of the burning building from falling less vertically and causing greater loss of life. It will also be admitted that in hindsight it was a failure not to inform the public of this, citing concern at the time that it would have unduly stressed a stressed population. Heroes will be lauded for having braved the danger of a burning skyscraper in order to place the necessary explosives. Probably they will have all perished.
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