Fires Versus Steel Buildings
The official explanation that fires caused the collapse of Building 7 is incredible in light of the fact that fires have never caused a steel-framed building to totally collapse, before or after September 11th, 2001.
Steel-framed high-rises (buildings of fifteen stories or more) have been common for more than 100 years. There have been hundreds of incidents involving severe fires in such buildings, and none have led to complete collapse, or even partial collapse of support columns.
|The Interstate Bank Building fire consumed several floors but did not damage the steel superstructure.|
Recent examples of high-rise fires include the 1991 One Meridian Plaza fire in Philadelphia, which raged for 18 hours and gutted 8 floors of the 38-floor building; 1 and the 1988 First Interstate Bank Building fire in Los Angeles, which burned out of control for 3-1/2 hours and gutted 4 floors of the 64 floor tower. Both of these fires were far more severe than any fires seen in Building 7, but those buildings did not collapse. The Los Angeles fire was described as producing "no damage to the main structural members". 2
Research indicates that even if a steel-framed building were subjected to an impossible superfire, hundreds of degrees hotter and far more extensive then any fire ever observed in a real building, it would still not collapse. Appendix A of The World Trade Center Building Performance Study contains the following:
In building fires outside of such laboratory experiments, steel beams and columns probably never exceed 500º C. In extensive fire tests of steel frame carparks conducted by Corus Construction in several countries, measured temperatures of the steel columns and beams, including in uninsulated structures, never exceeded 360ºC. 3
2. Interstate Bank Building Fire Los Angeles, California (May 4, 1988), iklimnet.com, [cached]
3. Fire Resistance of Steel Framed Car Parks, corusconstruction.com, [cached]