April 10, 2014
The Destruction of WTC7 on 9/11
For many years the destruction of World Trade Center Building 7 (WTC7), a 47-storey skyscraper that came down on the afternoon of 9/11 in a manner highly suggestive of a controlled demolition, was regarded as a mystery. This fact is well documented in David Ray Griffin’s book, “The Mysterious Collapse of World Trade Center 7″ (Olive Branch Press, 2010). The building was not hit by a plane. While a government investigation of this event was in process, many independent researchers concluded that WTC7 had been brought down by explosives in a controlled demolition.
After a number of false starts, the official explanation of this event, developed by the National Institute of Standards and Technology (NIST), attributed the “collapse” to small office fires. These fires allegedly led to the thermal expansion of beams that moved a girder off its seat and to the structural failure of a key supporting column. This theory has been vigorously challenged by independent researchers, most recently by those affiliated with Architects & Engineers for 9/11 Truth. The discovery of a significant error, and the omission by NIST in its reports of key structural features of the building, recently led noted attorney, William F. Pepper to write a letter to Todd J. Zinser, Office of the Inspector General (OIG), U.S. Department of Commerce to seek resolution.
William F. Pepper
The conclusion by independent scientists and engineers that WTC7′s destruction was a controlled demolition is supported by a large amount of physical, eyewitness, and other evidence. Most notably, the sudden onset of collapse was followed by a period in which the building fell over 100 feet in free fall. This was shown by Scientists’ member David S. Chandler and presented during the public comment period, forcing the government scientists to back down on their claim that no physical laws were violated by their theory. For more information on WTC7 and controlled demolition, see Evidence for WTC7 Ignored or Unexplained By NIST on this site and the article Freefall and Building 7 on 9/11 by David Chandler.
NIST’s Theory for WTC7
NIST’s theory for WTC 7, as set forth in the NIST report NCSTAR 1-9, is that a critical girder (A2001) was moved off its seats by thermally expanding beams. This girder supported the 13th floor in the northeast corner of the building between exterior column 44 and corner core column 79. According to NIST, this girder failure led to the collapse of eight floors in the area supported by the girder down to the 5th floor, leaving column 79 laterally unsupported for nine stories. As a consequence column 79 buckled, leading to a collapse that progressed from north to south on the interior east side, followed by an east to west collapse of the interior and the subsequent buckling of the now laterally-unsupported exterior columns.