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Old August 26th, 2017, 04:06 AM   #2601
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Is that the same as saying the encasement will be structural in the same way that concrete poured into forms with reinforcing is structural, or will encasing steel columns with concrete be for other reasons?

I'm no engineer, but simply encasing a column in a concrete skin can't add any structural support to it, surely.
It is not just a concrete skin, you just have to se it the other way, a concrete column reinforced with a steel beam inside it.

Anyway, I think that more that just a column, there will be shear walls for the core with the steel beams embed on it. just as they did in Manhattan West.

Here you can see it, all that rebar on the ground is for concrete shear walls that will have the steel beams inside them.

I think the reason for doing that, in this mixed structures, is that you have a better conection of the outer structure of steel columns to the concrete core if you have it attached to a steel structure that will be later encased in concrete, than just attaching it to the concrete structure.

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And here it is One Manhattan West, where they did that, they encased the steel structure in concrete to make the core.

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Old August 26th, 2017, 04:19 AM   #2602
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Ah, that's better.

As I suspected, without the rebar cages the addition of concrete would be almost pointless as it wouldn't be reinforced.

Although it does seem like a belt and braces approach.

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And here it is One Manhattan West, where they did that, they encased the steel structure in concrete to make the core.
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Old August 28th, 2017, 09:08 PM   #2603
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Taken today. Steady progress with the framing for the first two floors, but still no sign of the second crane, although I have seen pieces scattered around so it must be imminent.



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Old August 29th, 2017, 03:54 AM   #2604
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Old August 29th, 2017, 08:14 AM   #2605
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Ah, that's better.

As I suspected, without the rebar cages the addition of concrete would be almost pointless as it wouldn't be reinforced.

Although it does seem like a belt and braces approach.
Even the smallest and simple concrete volumes have rebar reinforcement. Only insane people wouldn't consider it, specially for a structure this tall. Don't panic bro.
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Old August 29th, 2017, 08:22 AM   #2606
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Quote:
Originally Posted by Nuwanda View Post
Is that the same as saying the encasement will be structural in the same way that concrete poured into forms with reinforcing is structural, or will encasing steel columns with concrete be for other reasons?

I'm no engineer, but simply encasing a column in a concrete skin can't add any structural support to it, surely.

Actually, concrete encasement increases the steel loading capacity dramatically, which is how/why the steel components can be reduced in size, the use of sheer connecters (those "nails" welded to the steel) and rebar in the concrete, help by making the dissimilar connection more "solid", but more importantly the added mass of the enclosed steel help dissipate and spread the load more evenly on to the foundation system, which in this case is solid rock, some cases involve blasting "sockets" into the rock, the last time i remember blasting was the the BofA tower on Bryant park though i'm sure its been done since then, essentially concrete encasement is done to better load distribution on to the foundation system, and it also lowers the costs in steel fabrication, by the use of smaller steel components
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Old August 29th, 2017, 09:10 AM   #2607
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Stunning!
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Old August 29th, 2017, 09:39 AM   #2608
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Yes, as I said, it makes sense to encase the columns in concrete if the concrete encasement also contains rebar.

If there's an example of concrete-encased columns without rebar, I'd be interested to hear about it.


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Actually, concrete encasement increases the steel loading capacity dramatically, which is how/why the steel components can be reduced in size, the use of sheer connecters (those "nails" welded to the steel) and rebar in the concrete, help by making the dissimilar connection more "solid", but more importantly the added mass of the enclosed steel help dissipate and spread the load more evenly on to the foundation system, which in this case is solid rock, some cases involve blasting "sockets" into the rock, the last time i remember blasting was the the BofA tower on Bryant park though i'm sure its been done since then, essentially concrete encasement is done to better load distribution on to the foundation system, and it also lowers the costs in steel fabrication, by the use of smaller steel components
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Old August 29th, 2017, 09:43 AM   #2609
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Who's panicking? I was contesting the idea that the columns would be encased in concrete using only the column as reinforcement. That didn't make sense so I asked for clarification, and it looks like if concrete is used to encase the columns a rebar cage would need to be used. Makes sense.

But thanks for your input.

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Even the smallest and simple concrete volumes have rebar reinforcement. Only insane people wouldn't consider it, specially for a structure this tall. Don't panic bro.
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Old August 29th, 2017, 09:50 PM   #2610
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In the case of a concrete core with steel framing inside it, such as what we see here, the reinforced concrete is actually the primary load-bearing element, and is meant to resist side forces(wind etc.) on the building. The internal steel frame is for attaching the outer steel structure to the core, and it helps to distribute the forces into the core walls. 1WTC and 4WTC used a similar system.
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Old August 29th, 2017, 11:30 PM   #2611
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Great explanation. Thanks.

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In the case of a concrete core with steel framing inside it, such as what we see here, the reinforced concrete is actually the primary load-bearing element, and is meant to resist side forces(wind etc.) on the building. The internal steel frame is for attaching the outer steel structure to the core, and it helps to distribute the forces into the core walls. 1WTC and 4WTC used a similar system.
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Old August 30th, 2017, 06:29 PM   #2612
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The slewing unit of the second crane has been on site for two days now. I'll check back later to see if there's any update on it but with construction continuing to move forward on cross-bracing, you'd think they'd start assembling it or at least the base by now.
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Old August 30th, 2017, 08:09 PM   #2613
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@One_Vanderbilt
nice, but I hope they'll be better aligned when installed on the tower.
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Old August 30th, 2017, 09:16 PM   #2614
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I spoke too soon this morning. Crane parts at the ready as of 2pm!

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Old August 31st, 2017, 07:02 AM   #2615
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https://www.instagram.com/p/BYbf_TFDAkF/



https://www.instagram.com/p/BYbgGj2jhm3/





https://www.instagram.com/p/BYbgQ7WjXzj/

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Old August 31st, 2017, 11:21 PM   #2616
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Second crane now going up. Should be done by the end of the long weekend:

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Old September 1st, 2017, 06:25 AM   #2617
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That looks like the new style Favco cab on the second crane.
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Old September 1st, 2017, 07:45 AM   #2618
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1 Vanderbilt by NyConstructionPhoto, on Flickr




1 Vanderbilt by NyConstructionPhoto, on Flickr
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Old September 2nd, 2017, 03:43 AM   #2619
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Love those construction photos with the Chrysler in the background. When this thing is complete it will make the Chrysler look really puny since it is right next to it.
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Old September 6th, 2017, 06:19 AM   #2620
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