Quote from Haroki:
Hey, if you can't prove it........
there are many documents describing the concrete walls surrounding the core, i already gave u one link earlier and that's just one doc.
also oxford uni describe it.
here's one:
http://algoxy.com/conc/core.html
and another:
http://www.ussartf.org/world_trade_center_disaster.htm
and again, scroll down 'till u get to the design and description:
http://www.discover.com/issue/oct-02/feature/featbuildings
there are many many more links in the internet.
and these are quotes from wtc engineers:
frank a. demartini, on-site construction manager for the world trade center, spoke of the resilence of the towers in an interview recorded on jan 25, 2001.
"the building was designed to have a fully loaded 707 crash into it. that was the largest plane of the time. i believe that the building could sustain multiple impacts of jetliners because this structure is like a the mosquito netting on your screen door --this intense grid-- and the jet plane is just a pencil puncturing that screen netting. it really does nothing to the screen netting."
john skilling who was one of the two structure engineers responsible for designing the wtc.
skilling recounts his people having carried out an analysis, which found the twin towers could withstand the impact of a boeing 707. he says, "our analysis indicated the biggest problem would be the fact that all the fuel [from the airplane] would dump into the building. there would be horrendous fire. a lot people would be killed, but he says."
the building structure would still be there.". "the buildings have been investigated and found to be safe in an assumed collision with a large jet airliner [boeing 707], traveling at 600miles per hour. analysis indicates that such collision would result in only
LOCAL DAMAGE WHICH COULD NOT CAUSE COLLAPSE OR SUBSTANTIAL DAMAGE TO THE BUILDING AND WOULD NOT ENDANGER THE LIVES AND SAFETY OF THE OCCUPANTS NOT IN THE IMMEDIATE AREA OF IMPACT."