“This open letter is being sent to you to request that you correct your four papers on the collapse of the WTC Towers, which were published by the Journal of Engineering Mechanics.” — Tony Szamboti
Architects and Engineers for 9/11 Truth
July 2, 2016
On June 19, 2016, Tony Szamboti, a mechanical engineer who has studied the World Trade Center collapses intensively for the past ten years, sent an open letter to Northwestern civil engineering Professor Zdeněk Bažant. Dr. Bažant is the author of four articles in the Journal of Engineering Mechanics that purport to explain why the lower sections of the WTC Twin Towers provided no discernible resistance to the falling upper sections.
The Open Letter
Dear Professor Bazant,
This open letter is being sent to you to request that you correct your four papers on the collapse of the WTC Towers, which were published by the Journal of Engineering Mechanics.
In these papers, the values used for the below three items:
The velocity of the descending upper section of the building
The mass of the descending upper section of the building
The column strength of the underlying story at the impact floor
have been shown in the intervening years to be significantly unrepresentative of the actual situation concerning the North Tower (WTC 1) at the time of its collapse.
By your use of free fall through the first story of the collapse it would seem that you had not measured the descent from video. Others have measured it, and the velocity after a fall of one story is approximately 6.13 meters/sec and not the 8.52 meters/sec velocity, resulting from a free fall through one story, used in your papers. This leads to a near doubling of the velocity component in the kinetic energy of the upper section, since it is squared with 6.132=37.58, and 8.522=72.59.