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Old March 11th, 2013, 07:08 PM   #6101
Ed007Toronto
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Major projects like this often have a damper at the top to counteract the wind. A big tank of water for example.
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Old March 11th, 2013, 07:09 PM   #6102
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@ CCs77, I also see slanted rebar, maybe for diagonal columns?
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Old March 11th, 2013, 09:35 PM   #6103
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I didn't notice that, but yes, it seems it could be. It is the best way to transfer loads between non continuos columns.
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Old March 11th, 2013, 10:04 PM   #6104
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London, England here. Looking at the 56th Street Cam what is that square gap in the left hand corner?
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Old March 11th, 2013, 10:09 PM   #6105
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Quote:
Originally Posted by WesselKornel View Post
I had a lecture today about skyscraper construction and common problems, which made me wonder what special precautions have been made to prevent this gem from swaying too much when there is a mild breeze. are both the core and the facade load bearing? Are there any other precautions made? Because, let's face it, this is a pretty unique piece of engineering.

Is there any danger of this going wrong, when it turns out that people living in the top keep feeling sick because of the swaying and that they have to undertake actions? I would really appreciate it if anybody could shine a light on this matter.
The core and walls both contribute to the rigidity of the structure. A mass damper will help counteract swaying as well. There are open air terraces every number of levels to allow a passage for air to channel through which will reduce wind resistance as well.
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Old March 11th, 2013, 10:15 PM   #6106
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New pictures on 432Park.com by Richard Berenholtz:



















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Old March 11th, 2013, 10:16 PM   #6107
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And some more:









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Old March 11th, 2013, 10:25 PM   #6108
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Why isn't that square gap filled in on the left hand side on the 56 Street Webcam??
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Old March 11th, 2013, 10:28 PM   #6109
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There should be a webcam on that last pov.
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Old March 11th, 2013, 11:14 PM   #6110
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Quote:
Originally Posted by The London BestShard View Post
Why isn't that square gap filled in on the left hand side on the 56 Street Webcam??
I've actually been wondering this for a while now as wel. Also what's the advantage of leaving the open pits instead of filling them in? Aren't those going to be parking ramps?
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Old March 11th, 2013, 11:28 PM   #6111
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Quote:
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I've actually been wondering this for a while now as wel. Also what's the advantage of leaving the open pits instead of filling them in? Aren't those going to be parking ramps?
Maybe so i added you is that ok? London, England here btw
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Old March 11th, 2013, 11:42 PM   #6112
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Quote:
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I've actually been wondering this for a while now as wel. Also what's the advantage of leaving the open pits instead of filling them in? Aren't those going to be parking ramps?
No parking ramps, it's way too small for that. But I leave the possibility open that it may become a construction elevator along the facade, starting below ground.
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Old March 11th, 2013, 11:44 PM   #6113
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Nice pouring progress today.

[IMG]http://i49.************/124kkl3.jpg[/IMG]

[IMG]http://i48.************/nb2gkm.jpg[/IMG]
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Old March 12th, 2013, 02:27 AM   #6114
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No parking ramps, it's way too small for that. But I leave the possibility open that it may become a construction elevator along the facade, starting below ground.
I think it will be a car elevator for the parking spaces underground. I think it will serve for trucks also (for unloading items to the retail) You can see it in some floor plan, but I don't get it.
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Old March 12th, 2013, 05:10 AM   #6115
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Quote:
Originally Posted by WesselKornel View Post
I had a lecture today about skyscraper construction and common problems, which made me wonder what special precautions have been made to prevent this gem from swaying too much when there is a mild breeze. are both the core and the facade load bearing? Are there any other precautions made? Because, let's face it, this is a pretty unique piece of engineering.

Is there any danger of this going wrong, when it turns out that people living in the top keep feeling sick because of the swaying and that they have to undertake actions? I would really appreciate it if anybody could shine a light on this matter.
Due to its unproportional width to height ratio, extra precautions must be made to thwart resonance which would result in the building swaying at .25λ, which would tear the upper floors from the building. There are other things, but that's one of the main priorities.
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Old March 12th, 2013, 05:46 AM   #6116
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Due to its unproportional width to height ratio, extra precautions must be made to thwart resonance which would result in the building swaying at .25λ, which would tear the upper floors from the building. There are other things, but that's one of the main priorities.
That's a good analysis. Are you an engineer?
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Old March 12th, 2013, 06:14 AM   #6117
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That's a good analysis. Are you an engineer?
He's just 15, so, i think he's a "maths and physics" expert!!!
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Old March 12th, 2013, 07:07 AM   #6118
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There's also just the sheer size of the core. There's barely any floor area left at all on each floor once you exclude the core. This is truly one of the strangest skyscrapers ever.
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Old March 12th, 2013, 07:32 AM   #6119
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Does that help?
Yes helps greatly, without the action photos I could n't tell any difference, thanx
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Old March 12th, 2013, 08:07 AM   #6120
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Yes helps greatly, without the action photos I could n't tell any difference, thanx
So it is true that it is rising at a rate of one floor per week with the mechanical floors taking around 2 weeks, can't wait going to be a major edition to the NYC skyline.
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