Boom Breaking: The Government Did Not Blow Up 7 WTC
posted by August 21 at 13:33 PMon
According to a new report by the National Institute of Standards and Technology, fire ignited by falling debris—and unimpeded by the sprinkler system, which failed to sprinkle because the city water main was broken—was the cause of the collapse of 7 World Trade Center.
The New York Times explains:
The investigators determined that debris from the falling twin towers ignited fires on at least 10 floors at 7 World Trade Center, which was about 400 feet north of where the city’s two tallest buildings once stood. The blazes burned out of control for six hours, as the city fire department, devastated by the collapse of the twin towers, abandoned its efforts to extinguish the fire, and the sprinkler system was incapacitated.
The heat from these fires, the investigators said, caused the beams on the lower floors of the east side of the tower to expand, ultimately causing a girder on the 13th floor to disconnect from a critical interior column that supported the building’s long floor spans. Once the 13th floor gave way, a cascade of floor failures started down to the fifth floor, leading to the overall collapse of the tower.
Skeptics have questioned if explosives were planted at 7 World Trade Center, as well as the twin towers and the Pentagon, as the Bush administration was seeking a justification to invade Iraq and Afghanistan. What started as a small number of such conspiracy theorists has only ballooned into a movement of sorts, largely fed by Internet sites that promote the theories.
“Seven World Trade Center is one of the key points of evidence, one of the smoking guns,” said Richard Gage, a California architect who leader a group called Architects and Engineers for 9/11 Truth. “There have been much hotter, longer lasting and larger fires in skyscrapers that have not fallen down.”
The investigators said that if the city water main had not been broken during the collapse of the twin towers, the sprinkler system would likely have put out the fires at 7 World Trade Center, and the building would not have fallen.
The engineers also examined whether diesel fuel tanks in the building — to power the Giuliani administration’s emergency operations center and other government offices — might have been a fuel source that caused the collapse. The investigators determined, based in part on computer models and videos of smoke coming from the tower, that the heat generated from any fuel-fed fires would not have been enough to cause the collapse.
Dr. Sunder said the investigation pointed to how expansion that can occur in steel as it heats up in a fire needs to be considered to prevent skyscraper collapses.
“Our take-home message today is the reason for the collapse of World Trade Center 7 is no longer a mystery,” Dr. Sunder said. “It did not collapse from explosives or fuel oil fires.”
Truthers can download and dissect the report here, if they are so inclined.