even IF structural failures were responsible for the collapse, I don't think the model can account for the heat left over in the pile of rubble. friction from falling rubble didn't cause THAT much heat
my thoughts are along the lines of
for WTC1 & WTC2 a combination of nano-thermite at strategic structural locations and a davy crocket sized nuclear demolition device in the lowest basement level to make a hole for it all to fall into
> judy wood
nano-thermite = exists and is well known
nuclear demolition devices = exists and is well known
judy wood's theories call in things that are NOT known to exist
only theory