Home > DocuBase > Article

« All DocuBase Articles

 

Follow DocuTicker on Twitter Bookmark and Share   Feed

Thursday, 28th January 2010

NIST Releases Final Report on Cowboys Facility Collapse

NIST Releases Final Report on Cowboys Facility Collapse
Source: National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) has released its final report on the May 2, 2009, collapse during a severe thunderstorm of the fabric-covered, steel frame practice facility owned by the National Football League’s Dallas Cowboys. The final report is strengthened by clarifications and supplemental text based on comments provided by organizations and individuals in response to the draft report on the collapse, released for public comment on Oct. 6, 2009. The revisions did not alter the study team’s main finding: the structure collapsed under wind loads significantly less than those required under applicable design standards.

Also left unchanged after the comment period is NIST’s recommendation that other fabric-covered frame structures be evaluated to ensure adequate performance under design wind loads. These evaluations, says NIST, should determine whether or not the fabric covering provides lateral bracing for structural frames considering its susceptibility for tearing; whether the building should be considered partially enclosed or fully enclosed based on the openings that may be present around the building’s perimeter; and whether the failure of one or a few frame members may propagate, leading to a partial or total collapse of the structure.

The Cowboys facility was designed as a series of identical, tubular steel frames with a tensioned fabric covering. Assumptions and approaches used in the design of the building resulted in significant differences between the original calculated wind load demands and structural capacities compared to those derived by NIST. For instance, the NIST calculated internal wind pressure due to the presence of vents and multiple doors based on classifying the building as “partially enclosed” rather than “fully enclosed” as stated in the design documents. Also, NIST did not rely on the building’s fabric to provide lateral bracing (additional perpendicular support) to the frames in contrast to what was stated in the design documents. Finally, NIST included the effects of localized bending in calculating the expected wind resistance of the structure, whereas the design documents did not indicate that such bending was taken into account.

Based on data acquired during a reconnaissance of the collapsed facility, NIST developed a two-dimensional computer model of a typical structural frame and then analyzed that frame to study its performance under various wind conditions. NIST worked with the National Oceanic and Atmospheric Administration’s (NOAA) National Severe Storms Laboratory to estimate the wind conditions at the time of collapse. The researchers determined that, at the time of collapse, the wind was blowing perpendicular to the long side of the building. Maximum wind speed gusts at the time of collapse were estimated to be in the range of 55 to 65 miles per hour—well below the design wind speed of 90 miles per hour as specified in the national standard for wind loads.

+ Full Report (PDF; 4.9 MB)


Category:

Source:

Views: 460




Please note: DocuTicker's editors collect citations for full-text PDF reports freely available on the web but we do not archive these reports. When you click a link to find and/or download the report, you are leaving the DocuTicker site. DocuTicker makes no representations regarding the ongoing availability of any report or any external resource. Links were accurate as of the date of posting.

« All DocuBase Articles

 

FreePint

FreePint supports the value of information in the enterprise. Read more »


FeedLatest FreePint Content:


  • Click to view the article Innography Comes of Age
    Wednesday, 20th August 2014

    Following her review of Innography and its key intellectual property products, Cathy Chiba considers the company's evolution and the value it offers its customers.

  • Click to view the article A User-Centred Approach to Privacy
    Wednesday, 20th August 2014

    There's been a lot of focus on data privacy recently and news stories often show how organisations are failing to protect their customers' data but are users doing enough to protect themselves? This article looks at how users and organisations can better protect personal data.

  • Click to view the article Due Diligence - from Business Burden to Business Benefit
    Tuesday, 19th August 2014

    Organisations face growing legal and reputational risks associated with doing business. These risks have become even more significant because of mounting pressure from regulators and an increase in business carried out in higher risk jurisdictions. Increasingly complex business regulations such as the US Foreign Corrupt Practices Act (FCPA) and the UK Bribery Act ensure that companies thoroughly examine third-party relationships to tackle the risk of money laundering, bribery and corruption and sanctions regimes. Mark Dunn looks at what the law says regarding Anti-Money Laundering and Anti-Bribery & Corruption, and how organisations can mitigate the risk of becoming involved in corruption through third parties (e.g. agents, suppliers) by implementing a simplified or Enhanced Due Diligence process.

  • ... more ...

All FreePint Content »
FreePint Topics »


A FreePint Subscription delivers articles and reports that support your organisation's information practice, content and strategy.

Find out more and order a FreePint Subscription by visiting the
completing our online form: Subscription Order page.


FreePint Testimonials

"FreePint's CoPs are: 'extremely relevant' and 'well worth attending'." Information Centre Manager, Financial, Government

Read more testimonials and supply yours »







 

 
 
 

Subscribe

Receive the DocuTicker Newsletter each week.

Find out more »

Article Categories

All Article Categories »

Sources

All DocuBase Sources »

Source Categories

All Source Categories »

Archive

All Archives »