University of Alaska Fairbanks Study Draft: A Structural Reevaluation of the Collapse of World Trade Center 7 (PDF - 66MB)
J. Leroy Hulsey, Ph.D., P.E., S.E., University of Alaska Fairbanks
Zhili Quan, Ph.D., Bridge Engineer, South Carolina Department of Transportation
Feng Xiao, Ph.D., Associate Professor, Nanjing University of Science and Technology, Department of Civil Engineering
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.