NIST WTC 7 Investigation Finds Building Fires Caused Collapse

User rating: 3 / 5 after 64 vote(s)

Typical WTC 7 floor showing locations of columns (numbered). The buckling of Column 79 was the initiating event that led to the collapse of WTC 7. The buckling resulted from fire-induced damage to floors around Column 79 failure of the girder between ...
Typical WTC 7 floor showing locations of columns (numbered). The buckling of Column 79 was the initiating event that led to the collapse of WTC 7. The buckling resulted from fire-induced damage to floors around Column 79, failure of the girder between Columns 44 and 79, and cascading floor failures
Click here to enlarge image

The fall of the 47-story World Trade Center building 7 (WTC 7) in New York City late in the afternoon of Sept. 11, 2001, was primarily due to fires, the Commerce Department’s National Institute of Standards and Technology (NIST) announced today following an extensive, three-year scientific and technical building and fire safety investigation. This was the first known instance of fire causing the total collapse of a tall building, the agency stated as it released for public comment its WTC investigation report and 13 recommendations for improving building and fire safety.


Full story »
All News summaries from General Science news
All News summaries for August 21, 2008

New penguin species found in New Zealand

9 hours ago | User rating: not rated yet
(PhysOrg.com) -- Australian and New Zealand researchers have used ancient DNA from penguin fossils to make a startling discovery that may change the way we view species extinctions.

Falling home ownership, equity, affect college enrollment

11 hours ago | User rating: not rated yet
Sagging college enrollments may be the next symptom of the sub-prime mortgage mess, according to a University of Michigan economist.

Scientists fight stem rust UG99 before it becomes a threat

11 hours ago | User rating: not rated yet
(PhysOrg.com) -- Wheat breeders and plant pathologists at Montana State University are part of a global effort to develop varieties of wheat resistant to a new fungus. UG99, a stem rust strain that was first discovered in ...

Scientist Unlocking the Secrets of Sea Slug that Lives Like a Plant

11 hours ago | User rating: not rated yet
(PhysOrg.com) -- Photosynthesis generates the oxygen needed for life on earth as well as the biomass for food and biofuel production. The process is driven by the absorption of the sun’s energy by tiny green "bodies" called ...

Archeologists say they found witch doctor skeleton

11 hours ago | User rating: not rated yet
(AP) -- Archeologists believe a 12,000-year-old skeleton found in a grave containing 50 tortoise shells, a leopard pelvis, a cow tail and part of an eagle wing is the remains of a witch doctor.
Goto Archive PhysOrg Forum Goto Archive Video Goto Archive Editorials Goto Archive Free Magazines Goto Archive Newsletter

News Archive