Towers Weakened by Planes; Brought Down by Fire
WASHINGTON, D.C., MAY 1, 2002
Analysis by a team of 25 of the nation's leading structural and fire protection engineers suggests that the World Trade Center Towers could have remained standing indefinitely if fire had not overwhelmed the weakened structures, according to a report presented today at a hearing of the House Science Committee. That finding is significant, said W. Gene Corley, Ph.D., team lead for the ASCE/FEMA Building Performance Study Team, because extreme events of this type, resulting in such substantial damage, are generally not considered in building design, and the fact that these structures were able to successfully withstand such damage is noteworthy.
Only a handful of architects and engineers question the NIST Report, but they have never come up with an alternative. Although at first blush it may seem impressive that these people don't believe the NIST Report, remember that there are 123,000 members of ASCE(American Society of Civil Engineers) who do not question the NIST Report. There are also 80,000 members of AIA(American Institute of Architects) who do not question the NIST Report.
http://911-engineers.blogspot.com/
Science Daily
Science News
“Like most building collapses, these events were the result of a combination of factors,” said Shyam Sunder, lead investigator for the agency’s building and fire safety investigation into the WTC disaster. “While the buildings were able to withstand the initial impact of the aircraft, the resulting fires that spread through the towers weakened support columns and floors that had fireproofing dislodged by the impacts. This eventually led to collapse as the perimeter columns were pulled inward by the sagging floors and buckled.”
http://www.scienceda...50411122017.htm
WTC Pre-Collapse Bowing Debunks 9/11 "Controlled Demolition" Theory
Indications of the Imminent Collapse of the World Trade Center Buildings Disprove Explosives Theory
Scientists investigating the Sept. 11, 2001 collapse of the twin towers said, "the World Trade Center towers showed telltale signs they were about to collapse several minutes before each crumbled to the ground." There would not be telltale signs if it was explosives (Controlled Demolition) that caused the buildings to collapse.
The World Trade Center's Steel Structure Was Buckling Before the Collapse
Police, Firemen and Civilians Saw Warning Signs of Collapse of the Twin Towers on September 11th 2001
Before the collapse of either tower, evidence the structures of the WTC were failing was reported by Police, Firemen and civilians. As already mentioned, flying around outside the WTC, the NYPD helicopters reported "an inward bowing of the buildings' columns in the minutes before they collapsed." Inside WTC 1, New York City Fire Department's Assistant Chief Joseph Callan realized the building was in trouble even before the first building, building two, collapsed. Interviewed Nov. 2, 2001, Assistant Chief Callan told New York City Fire Marshal Michael Starace, "Approximately 40 minutes after I arrived in the lobby, I made a decision that the building was no longer safe. And that was based on the conditions in the lobby, large pieces of plaster falling, all the 20 foot high glass panels on the exterior of the lobby were breaking.
There was obvious movement of the building, and that was the reason on the handy talky I gave the order for all Fire Department units to leave the north tower. Approximately ten minutes after that, we had a collapse of the south tower, and we were sort of blown up against the wall in the lobby of the north tower, and we gathered together those of us who were still able to."
http://www.represent...xplosives2.html
9/11 cops saw collapse coming
New York Daily News - June 19th, 2004
The World Trade Center towers showed telltale signs they were about to collapse several minutes before each crumbled to the ground, scientists probing the Sept. 11, 2001, disaster said yesterday.
In the case of the north tower, police chopper pilots reported seeing the warning signs - an inward bowing of the building facade - at least eight minutes before it collapsed at 10:29 a.m.
But emergency responders inside the tower never got the order to evacuate due to faulty communications equipment and garbled lines of command, investigators with the National Institute of Standards and Technology said in its second interim report on the collapse's causes.
"The NYPD aviation unit reported critical information about the impending collapse of the buildings," lead investigator Shyam Sunder said at a presentation in midtown.
http://www.skyscrape...e_20040619.html
NYC Police Saw Sign of Tower Collapse, Study Says (Update2)
June 18 (Bloomberg) -- Federal engineering investigators studying the destruction of the World Trade Center's twin towers on Sept. 11 said New York Police Department aviation units reported an inward bowing of the buildings' columns in the minutes before they collapsed, a signal they were about to fall.
http://www.bloomberg...=top_world_news