Quote:
Originally Posted by CalibratedZeus
The Empire State is approximately 370,000 tons...
The Sears Tower is around 222,500 tons...
I have not found any solid figures for the Freedom Tower but it is expected to use around 50,000 tons of steel by the end. So even figuring in concrete it looks like it will weigh even less.
The thing to remember is Today's steel is stronger, lighter, etc. There also will not be such a huge amount of concrete poured for the core compared to the Empire State's and Sears Tower's concrete amounts.
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Today's steel is stronger, but still weighs about 490 pounds per cubic foot. You are also grossly underestimating the amount of concrete in Tower One.
Neither the Sears tower or the ESB have a concrete core, so 90% of the concrete in those buildings is in the floor slabs.
A rough estimate of the core and floor slab weights plus the 46,000 tons of structural steel plus a rough estimate of the weight of the rebar gives me a figure of 310,000 tons. That does NOT include anything from bedrock to the ground floor except the perimeter columns. The 310,000 tons is the weight of the structure, not the finished building. I'm sure that 370,000 tons for the ESB includes everything (plumbing, electrical, non-load bearing walls heat and AC plants etc. and 8,000 tons of bricks)
Another way to look at is Tower One well weigh about as much as 6.8 Iowa Class Battleships.