Christophera
Evidence & Reason Rule
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this is a concrete core.
In the new WTC 7 rebuild with a concrete core the steel was erected ahead of the concrete casting.
http://www.structuremag.org/article.aspx?articleID=834
The steel-first approach further challenged the structural engineers, Bart Sullivan contended, with the integration of the two structural lateral systems in steel and concrete. Additionally, without the core in place to stabilize the steel framing, the issue of stabilizing the building during construction was a concern since the main lateral resisting system and the large floor openings required for the ACS created a situation where the floor diaphragms would be discontinuous. To solve these problems, Bart explained in detail the structural solutions to maintain the continuity of the floor diaphragm by using embedded link beams to behave compositely with the concrete core walls, and temporary perimeter bracing to stabilize the building during construction.
That is a concrete core being built ahead of the steel structure. Here is the concrete core of WTC 2 on 9-11.
If that is a steel core being built then show your knowledge of the steel structure and building techniques by naming the nmbered tructures shown during construction. You've already failed at this several times. We await your continued failure.
this is the STEEL core being built at the world trade center.
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Agent, you are failing and have failed.
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