No Precedent and New Phenomenon in Structural Engineering
First Ever "Fire Induced" Collapse of Steel Skyscraper
WTC Building 7 with small, isolated office fires on floors 6-10, 13-14, 19-22, and 29-30 suddenly imploded and collapsed completely, neatly, and symmetrically. According to NIST and the The Final Report on the Collapse of World Trade Center Building 7, WTC 7 collapsed due to thermal expansion of steel beams, leading to the progressive collapse of 9 floors. The failure of column #79 came seconds before the rest of the core columns due to the thermal expansion, according to NIST (Gann, 2008). This made Building 7 the first tall building known to have collapsed primarily due to uncontrolled fires and the first and only steel skyscraper in the world to have collapsed due to fire (NIST WTC 7 Investigation, 2011).
However, high-rise buildings with much hotter, larger, and longer lasting fires have never collapsed. In other word, there is no precedent for a skyscraper collapse due to a fire (7 Facts About Building 7).
However, high-rise buildings with much hotter, larger, and longer lasting fires have never collapsed. In other word, there is no precedent for a skyscraper collapse due to a fire (7 Facts About Building 7).
The Beijing Television Cultural Center inferno which burned for hours on end until finally dying out on its own demonstrates how hydrocarbon office fires cannot burn at a high enough temperature to bend, weaken, or melt steel nevertheless to evaporate it. In every other instance of a high-rise fire besides WTC Building 7 the steel-structure has always remained intact, regardless of how large and how long the fire burned for (Architects and Engineers for 9/11 Truth).