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Originally Posted by gazzae
The WTC would have had a concrete centre would it not for the lift shafts etc?
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Yes, but it would not have been structural concrete and would have been thin walls with light reinforcement purely for the thermal shrinkage of the concrete.
The WTC was a steel framed building all the strutural forces would have been taken by the frame.
The pentagon had 2feet thick reinforced walls with metal "tubes" I can only assume like scaffold poles. Then several more reinforced concrete walls after that.