Is this paper accurate?


I've alwys felt that the twin towers' steel frames were
far too strong to fall through themsleves with only gravity
as a force. This paper seems to confirm that theory.

http://worldtradecentertruth.com/Journal_5_PTransferRoss.pdf

The author of this work, Gordon Ross, was born in Dundee, Scotland. He
holds degrees in both Mechanical and Manufacturing Engineering,
graduating from Liverpool John Moores University, in 1984.

Summary:
"This paper examines the elastic loading and plastic shortening
phases of the columns of WTC 1 after impact of the upper 16 storeys of
the building upon the lower storeys and its effect on the momentum
transfer after the collision. An energy balance is derived showing
that there is an energy deficit before completion of the plastic
shortening phase that would not allow the collapse to continue
under the constraints of this paper."
.