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Thread: 50 East 57th Street @ 432 Park Avenue (former Drake Hotel site)

  1. #1606

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    Quote Originally Posted by ZippyTheChimp View Post
    Those multicolor tenements on 3rd are horrible.

  2. #1607

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    Name one building on 3rd Ave that isn't horrible (ok, other than the Lipstick Building).

  3. #1608

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    I agree, but at least most of them are clean, this POS looks like it should be in a third world place.

  4. #1609

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    Where are we height-wise on this? Approaching the halfway mark?

  5. #1610

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    The core recently passed 800 ft. So about 60%.

  6. #1611

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    Wow this seems to be moving quick. Probably can thank the very simple design and small floor plates for that.

  7. #1612

  8. #1613

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    And such is the advantage of a simple design. They don't have to change the formwork. They just move it up, reassemble it, put in the rebar, and pour.

    Quote Originally Posted by arcman210 View Post
    Wow this seems to be moving quick. Probably can thank the very simple design and small floor plates for that.

  9. #1614

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    An interesting read on the structural engineering aspects of this project:

    http://www.forconstructionpros.com/a...-tall-building

  10. #1615

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    Quote Originally Posted by BBMW View Post
    And such is the advantage of a simple design. They don't have to change the formwork. They just move it up, reassemble it, put in the rebar, and pour.
    Wouldn't they use less concrete as they go higher?

  11. #1616

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    From bill schintler's link:
    The 44-inch wide exterior columns spaced 15 foot 6 inches apart are connected by horizontal spandrel perimeter beams (also 44 inches wide) to form the exterior tube, the depth of these elements decreases as the building goes up.
    I think the speed of construction is more a factor of concrete delivery to the upper floors.

  12. #1617

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    They may thin out the columns, but likely in steps. I don't know what they're doing with the core. That looks slipformed, IIRC. The horizontal slabs would likely stay the same.

    Quote Originally Posted by arcman210 View Post
    Wouldn't they use less concrete as they go higher?

  13. #1618

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    It comes down to crane and elevator time more so than concrete delivery.

  14. #1619

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    I wonder if the columns in the exterior walls are load bearing? They look big enough.

    Edit: Just went on the building site, and flipped through the model shots. Yes, the exterior walls are load bearing. They're not showing any interior columns in the model shots. That explains why the building looks the way it does. If they did a more complicated exterior, they would have needed to put in internal columns. This way they don't.
    Last edited by BBMW; March 20th, 2014 at 04:34 PM.

  15. #1620

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    The exterior walls are almost 4 feet thick on the lower floors! And, tapering to something much less towards the top. The exterior is very much structural, as is the core. Heavily reinforced floor plates tie the two elements together, increasing the rigidity of the structure. Look at this 2.5 inch diameter rebar in the exterior walls - it is my understanding it is preformed and manufactured into sections prior to delivery to the site. Material is more expensive this way, but it reduces labor and construction time.

    http://www.432parkavenue.com/new-con...3/06/C-252.jpg

    According to my post yesterday "Concrete strength changes as the building goes up — 14,000 psi for the first 40 floors, 12,000 psi between the 40th to the 51st floors, and 10,000 psi for the 51st and above floors.". A few years ago, 14,000 psi or stronger was used in only two major buildings in NYC: WTC-1 and Gehry's Beekman tower...

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