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/ Cause of Twin Towers Collapse
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April 8, 2005
NIST's Shyam Sunder Releases WTC Report
Ineffective fireproofing and a shortage of staircases were the main reasons for the collapse of the World Trade Center, according to a report released Tuesday and led by Dr. Shyam Sunder.
INDOLink
April 8, 2005
Fireproofing key to Twin Towers' collapse
fireproofing and a shortage of staircases are highlighted in a preliminary federal safety report into the attacks on the World Trade Center, issued by the US National Institute of Standards and Technology (NIST) on Tuesday.
New Scientist
October 22, 2004
Probe: Intense Flames Sped WTC Collapse
Federal investigators believe the second World Trade Center tower fell much more quickly than the first because it faced a more concentrated, intense fire inside, officials said Tuesday.
ABC News
October 22, 2004
Study Suggests Design Flaws Didn't Doom Towers
After the most sophisticated building analysis in United States history, federal investigators have arrived at the clearest picture yet of the sequence of events that led to the collapse of the World Trade Center towers, largely ruling out a design flaw in the buildings as a central factor in the catastrophe.
The New York Times
October 1, 2004
World Trade Towers design exceeded wind load codes
The National Institute of Standards and Technology (NIST) reported on Sept. 17 that it has done additional analysis of the wind "loads" that the World Trade Center (WTC) towers were originally designed to resist--critical data to help the agency better assess the overall strengths and baseline performance of the two buildings before they were brought down by the terrorist attacks of Sept. 11, 2001.
EurekAlert
August 26, 2004
Investigators simulate WTC floor fire
Federal officials re-created a floor system of the World Trade Center and conducted a fire test on it Wednesday as part of an investigation into the towers' collapse on Sept. 11, but results didn't immediately provide clear answers.
AP via Seattle P-I
August 26, 2004
Fire Testing Is Questioned in Findings on Towers
In a conclusion that may have ramifications for understanding other tall buildings and future structures, investigators from the National Institute of Standards and Technology found that the test used to determine fireproofing sufficiency, then and now, may itself be flawed - unable to predict accurately what will be required in a real-life fire. As a result, the towers indeed may been more vulnerable to a fire than anyone could have known.
New York Times
July 21, 2004
Agency Revises Theory of WTC Collapse
Federal investigators analyzing evacuation patterns at the World Trade Center estimate more people than previously thought died below the areas hit by the hijacked planes.
AP via Guardian Unlimited
December 15, 2003
Trade Center Fireproofing Tests Suggest a Wider Safety Problem
Hundreds of buildings nationwide with fireproofing similar to that used in the World Trade Center could be far more prone to structural damage during major fires than previously thought, according to preliminary calculations by federal investigators.
New York Times
December 3, 2003
New Evidence Is Reported That Floors Failed on 9/11
Federal investigators said here Tuesday that new evidence supported earlier suggestions that the floor supports in the World Trade Center began failing in the minutes before the towers fell and might have played a major role in their collapse.
New York Times
September 18, 2003
Interviews will examine why trade center collapsed
The federal agency charged with investigating the collapse of the World Trade Center on Sept. 11, 2001, will begin interviewing survivors and emergency crews in the next few weeks in its effort to determine why the twin towers fell after terrorists crashed two hijacked airliners into the buildings.
Sunspot.net
Spetember 8, 2003
Officials Hope New 9-11 Tape Will Aid WTC Probe
Federal officials investigating the destruction of the World Trade Center said Sunday they hope a newly surfaced videotape showing both hijacked planes hitting the towers will shed light on why the north tower collapsed.
AP Online
August 28, 2003
Steel Not Seen As Factor in WTC Collapse
Early tests on steel beams from the World Trade Center show they generally met or were stronger than design requirements, ruling them out as a contributing cause of the collapse of the towers, federal investigators said Wednesday.
ABC 7
June 25, 2003
New instrument tests the metal of WTC steel
A new instrument at the National Institute of Standards and Technology (NIST) that operates like an air-powered battering ram is being used to study steel salvaged from the World Trade Center (WTC).
EurekAlert
June 5, 2003
New Theory on Why WTC Towers Collapsed
A vulnerability in the structure of the World Trade Center towers may have contributed to their collapse after the September 11 attacks, a leading structural engineer at the University of Edinburgh's School of Engineering and Electronics said on Wednesday.
Reuters
May 8, 2003
WTC Fireproofing Not Tested to Hold up to Code, Panel Says
Fireproofing on the steel floor supports in the World Trade Center was never tested and might have been too thin to hold up in a fire for the two-hour minimum set by the city building code, federal investigators said Wednesday.
AP via The State
May 8, 2003
Portion of WTC Had Upgraded Fireproofing
Federal investigators examining the World Trade Center collapse said Wednesday only 30 of the 110-story twin towers had fireproofing material upgraded from one-half inch to 1 1/2 inches.
UPI via Washington Times
April 23, 2003
Engineering Firm Says Collapse of Twin Towers Two Separate Events
An analysis by an engineering firm says both towers fell because their inner steel cores were weakened by fire. The analysis was paid for by leaseholder Larry Silverstein.
CBS 2
April 10, 2003
Researchers turn to WTC survivors
Researchers are hoping interviews with survivors from the World Trade Centre's north tower can help explain why dozens of people below the building's 93rd floor did not escape.
The Age
February 21, 2003
Cables Hold Promise in Protecting Existing Buildings from Bombs
Researches conducted by the UC Berkeley Researchers prove that securing a steel cables around the floors of existing building can be used to prevent building from collapsing caused by a terrorist bomb.
The University of California, Berkeley
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