![]() This type of steel, which was not available at the time the WTC was built, would not necessarily prevent a building from collapsing during a fire, but it would give occupants more time to escape. ![]() These tests led to the development and validation of performance criteria for fire resistive steel. In addition, NIST scientists conducted tests of steel from the WTC buildings to measure their mechanical properties at normal and elevated temperatures. NIST’s recommendations have had a significant impact on design and construction practices for high-rise buildings worldwide, including the new buildings at the rebuilt World Trade Center site. codes and standards were subsequently updated to improve areas such as structural integrity, fire resistance, occupant evacuation and emergency responder communications. While the federal government has no regulatory authority for building and fire codes, many U.S. In the reports, NIST made 31 recommendations for improvements to building and fire codes, standards, and practices based on the WTC investigation. The WTC investigation has had a significant legacy. Gathering and analyzing thousands of pieces of video, photographic, and audio evidence from professional sources and the publicīuilding and Fire Codes, Standards and Practices.Examination of hundreds of structural steel components from WTC buildings.Extensive reviews of design, construction, maintenance and inspection documents for the buildings.Interviews with 1,056 surviving occupants of the WTC buildings and 116 emergency responders. ![]() More than 200 professionals and technical subject matter experts, including 85 NIST staff members, answered the call and participated in the investigation.Īs part of the investigation, the NIST team gathered every bit of evidence they could find. NIST was given this authority when Congress passed, and the President signed into law, the National Construction Safety Team Act of 2002. NIST responded to calls from Congress and the public to carry out a federal investigation of why the buildings collapsed, the evacuation of building occupants and the emergency response. The collapse of the WTC buildings following the terrorist attacks on September 11, 2001, was one of the worst building disasters in US history, killing 2,749 people, including 400 emergency responders.
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