The collapse of the World Trade Center (WTC) towers on September 11, 2001,
was as ... The airplane impact with damage to the columns. ... Part of the problem
is that people (including engineers) often confuse temperature and heat. .... the
adjacent members and the collapse occurs like a row of dominoes falling down.
The World Trade Center Collapse: An Engineer's Perspective. ... Some people
were concerned the building would fall down. ... Upper floors pancaked down
onto lower floors, causing a domino effect that left each building in ruins within
ten seconds. ... Given that the south tower did in fact tip over (and quite visibly so)
Oct 9, 2001 ... One month after the attack on the World Trade Center, M.I.T. structural engineers
offer their take on how and why the towers came down. ... of the gravity system,
and for an hour or so they did stand there," McNamara said. ... they stood long
enough for the majority of the people to be successfully evacuated.