NISTの諮問委員会が昨年12月に開催された。下記はその議事次第である。2番目の議題はＷＴＣ７棟の調査研究に関する報告とある。ご覧になっていただくとわかるが、まだ殆ど調査は進んでいないと発表者は言い訳している。
この調査は、NISTが外部に発注した。入札に際してのＮＩＳＴの説明と入札を勝取った業者の紹介を付しておく。
http://wtc.nist.gov/media/NCSTACmeetingDec06.htm
NCST Advisory Committee Meeting, December 14, 2006
The National Construction Safety Team (NCST) Advisory Committee met via teleconference on Thursday, December 14, 2006, from 9:00 a.m. to 11:00 a.m.
Agenda
9:00 a.m. Welcome and Opening Remarks Paul Fitzgerald
NIST Acting Deputy Director’s Opening Remarks James Hill
9:10 a.m. Status of World Trade Center 7 Investigation Therese McAllister and Discussion
9:50 a.m. Discussion of NCST Advisory Committee Paul Fitzgerald Report to Congress
10:30 a.m. Break (Public Commentors Call-In)
10:35 a.m. Public Comment Period
11:00 a.m. Adjourn
· Final Meeting Minutes (pdf)
· Presentation: "WTC 7 Technical Approach and Status Summary", December 12, 2006, Therese McAllister, NIST (pdf)
o Public Comments - Arthur Scheuerman (pdf)
o Public Comments - Jerry Leaphart (pdf)
· The Federal Register Notice (announcing the meeting)
==========＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
入札とその業者（長いので多くを省略）についての情報
http://wtc.nist.gov/solicitations/wtc_award0539.htm
Awards
WTC 7 STRUCTURAL ANALYSIS AND COLLAPSE HYPOTHESES, CONTRACT MODIFICATIONS FOR STRUCTURAL AND BLAST ANALYSES
Under GSA Contract number GS23F0278M, NIST Order No. SB1341-06-8-0539, as a firm fixed price effort, has been awarded to APPLIED RESEARCH ASSOCIATES, INC. (ARA) of Albuquerque, New Mexico, to append the following tasks to the original contract awarded on March 31, 2006. Under the appended tasks, the ARA (1) shall conduct analyses of impact damage and fire effects to provide candidate initiating events which may lead to structural failures and global collapse, and (2) shall determine if there is any scenario of a hypothetical blast event or events that could have occurred in WTC 7 on September 11, 2001.
As part of determining likely modes of failure in WTC 7, impact by falling debris from WTC 1, fire events, and hypothetical blast events are being considered for their contribution to the collapse of WTC 7. NIST has documented debris damage and fire growth and spread in WTC 7, based on available evidence. NIST is analyzing scenarios for the event that initiated the collapse of the building. As a part of this work, NIST 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 as a result of blast.
（中略）
The specific tasks that ARA will perform with SGH (task 1) and LGI (task 2) include:
1. Identify and analyze hypothetical blast scenarios in three phases, with the results from each phase being used to decide if the analyses in the next phase is required:
A. Identify hypothetical blast scenarios, using analysis and/or experience, to determine conditions that would fail specified column sections by direct attachment of explosive materials.
B. Analyze the overpressure produced by the blast load and determine if the overpressure would have failed windows in WTC 7.
C. Determine if the overpressure would result in sound levels transmitted through intact WTC 7 windows that could be heard outside the building.
2. Conduct the following analyses using a three-dimensional ANSYS model (provided by NIST) of the lower 16 floors of WTC 7:
A. Review the ANSYS model provided by NIST for conducting structural analysis of damage to components and the effect of time-varying temperatures. Identify possible revisions/improvements to the ANSYS model that may improve efficiency, accuracy and/or capture of critical failure modes.
B. Work with NIST staff to incorporate agreed upon changes to the ANSYS model.
C. Determine the structural response of WTC 7 for up to six scenarios of structural damage from debris impact and temperature histories provided by NIST. NIST will conduct analyses of other scenarios in parallel. Work with NIST to identify the structural response and failure modes for each analysis.
· （残全て略）

http://wtc.nist.gov/media/WTC7_Approach_Summary12Dec06.pdf

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