Posted Apr 22, 2012, 9:08 PM
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Registered User
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Join Date: May 2010
Location: New York City
Posts: 320
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This is slightly off topic and I am sure it has been already talked about here or in another forum, but why does 3 WTC have a concrete core rather than the steel frames used in 1 and 4 WTC? I know that both are used but can somebody explain (or point to where I could find info on) the differeces between the two construction methods? Thanks.
The tower is looking good!
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