On September 11, 2001, the structure was substantially damaged by debris when the nearby North Tower (1 World Trade Center) collapsed. The debris ignited fires on multiple lower floors of the building, which continued to burn uncontrolled throughout the afternoon.

2015年5月1日 · The principal conclusion of our study is that fire did not cause the collapse of WTC 7 on 9/11, contrary to the conclusions of NIST and private engineering firms that studied the collapse. The secondary conclusion of our study is that the collapse of WTC 7 was a global failure involving the near-simultaneous failure of every column in the building.

2011年9月13日 · The collapse of WTC 7 was caused by a single initiating event—the failure of a northeast building column brought on by fire-induced damage to the adjacent flooring system and connections—which stands in contrast to the WTC 1 and WTC 2 failures, which were brought on by multiple factors, including structural damage caused by the aircraft ...

2008年8月21日 · 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.

2011年6月30日 · NIST NCSTAR 1-1G: Amendments to the Fire Protection and Life Safety Provisions of the New York City Building Code by Local Laws Adopted while World Trade Center 1, 2, and 7 Were in Use

2022年3月15日 · World Trade Center 7 (WTC7) was a 47-storey office building within the WTC complex that collapsed due to a fire initiated by debris from the collapse of WTC1. In the following years, detailed investigations were carried out by expert teams to pinpoint the cause of the progressive failure of WTC7.

2008年11月21日 · Strengthened by clarifications and supplemental text suggested by organizations and individuals worldwide, the final report on the collapse of the 47-story World Trade Center building 7 (WTC...

2021年9月16日 · Years of investigation have concluded that the building collapsed because of fires ignited by debris falling from the North Tower’s collapse. A post on Instagram has claimed …

2008年8月21日 · 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...

On September 11, 2001, WTC 7 endured fires for almost seven hours, from the time of the collapse of the north WTC tower (WTC 1) at 10:28:22 a.m. until 5:20:52 p.m., when WTC 7 collapsed. The collapse of WTC 7 was the first known instance of the total collapse of a tall building primarily due to fires. Con Edison Substation