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Old January 25th, 2009, 11:17 AM   #7301
christos-greece
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Quote:
The north core will rise above grade in summer 2009
Good news
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Old January 25th, 2009, 02:05 PM   #7302
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I think the construction of the north core will be an important factor for the total construction of the tower.
Because you can't build any floors with half a core.
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Old January 25th, 2009, 02:53 PM   #7303
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Quote:
Originally Posted by Carlo[NL] View Post
I think the construction of the north core will be an important factor for the total construction of the tower.
Because you can't build any floors with half a core.
Definitely one of the most brilliant statements ever written in this forum!
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Old January 25th, 2009, 03:05 PM   #7304
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Originally Posted by Msradell View Post
Definitely one of the most brilliant statements ever written in this forum!
Yes it was, the statement was more then CORRECT. You can't build the floorplates without completing the central core(s) first.
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Old January 25th, 2009, 07:03 PM   #7305
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then how do you explain many buildings built in advance of the core? i'm not too sure but its not impossible and fairly common.
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Old January 25th, 2009, 08:06 PM   #7306
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Quote:
Originally Posted by Carlo[NL] View Post
I think the construction of the north core will be an important factor for the total construction of the tower.
Because you can't build any floors with half a core.
That it is indeed
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Old January 25th, 2009, 08:38 PM   #7307
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then how do you explain many buildings built in advance of the core? i'm not too sure but its not impossible and fairly common.
What? Maybe you mean 'in advance of the foundations'.

Seriously ...
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Old January 25th, 2009, 10:14 PM   #7308
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The steel being erected on the south half of the core makes it possible for the floor beams to be erected ahead of the core, if you define the core as being the re-bars and concrete. (I do) The north half of the core has to reach the present height of the south half before the 3rd floor can go in. (The second floor hangs from the 3rd floor and the core.) It goes without saying that the perimeter columns have to reach that height also. (With a 50 foot and a 24 foot section)
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Old January 26th, 2009, 03:25 AM   #7309
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Quote:
Originally Posted by AltinD View Post
What? Maybe you mean 'in advance of the foundations'.

Seriously ...
the new goldman sachs, 7 wtc, and BofA in nyc were built with the core lagging behind.... many others are built the same way. you dont have to have the core first.

image hosted on flickr

Last edited by philvia; January 26th, 2009 at 03:36 AM.
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Old January 26th, 2009, 04:28 PM   #7310
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But that building don't have any central core at all (I think even the old WTC twins didn't), while FT has.
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Old January 26th, 2009, 04:40 PM   #7311
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GS building is just over 200m

P.S.
old WTC had central core:



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Old January 26th, 2009, 05:17 PM   #7312
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Quote:
Originally Posted by AltinD View Post
But that building don't have any central core at all (I think even the old WTC twins didn't), while FT has.
Godlman Sachs does have a core. If you look at that picture you can see the core about 3 floors below the top. Earlier pictures of that building show a core rising.
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Old January 26th, 2009, 06:15 PM   #7313
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the north tower collapsed due to the too much damage to the core...
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Old January 26th, 2009, 07:47 PM   #7314
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Quote:
Originally Posted by philvia View Post
the new goldman sachs, 7 wtc, and BofA in nyc were built with the core lagging behind.... many others are built the same way. you dont have to have the core first.

image hosted on flickr
I cannot see a central core indeed... Seems little weird and strange to built a tower of 50 floors (?) without central core...
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Old January 26th, 2009, 08:56 PM   #7315
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Quote:
Originally Posted by christos-greece View Post
I cannot see a central core indeed... Seems little weird and strange to built a tower of 50 floors (?) without central core...
The core IS there; however, it's more than 10 floors behind the rest of the building. The whole building will be cladded before the core reached the top. I've always thought it was a strange way to construct a building, but it must work as well none the less...
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Old January 26th, 2009, 10:45 PM   #7316
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taken during the second week of January




Last edited by AJohnstone; January 26th, 2009 at 10:46 PM. Reason: grammatical
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Old January 27th, 2009, 12:38 AM   #7317
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Originally Posted by CHAPINM1 View Post
The core IS there; however, it's more than 10 floors behind the rest of the building. The whole building will be cladded before the core reached the top. I've always thought it was a strange way to construct a building, but it must work as well none the less...
But is that a reinforced concrete core, or is just a elevators shaft?

Regardless, it's obvious that in that building the core does not hold the building together (as to speak), as it is obvious from what has been build so far, that FT's central core will bear the main load of the structure therefore in the case of Freedom Tower the floors cannot be constructed before both the central cores have advanced upward.
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Old January 27th, 2009, 01:17 AM   #7318
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AltinD got it. The GS building is a braced skeleton frame, the core is just an area where the stairs and elevators are. Tower One is a Hybrid Tube design with a monolithic core. The Twin Towers were a Simple Tube and the Sears Tower is a Bundled Tube.

Last edited by Zensteeldude; January 27th, 2009 at 01:28 AM.
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Old January 27th, 2009, 02:33 AM   #7319
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The Bank of America and 7 World Trade Center both have concrete cores that supports each buildings structural load yet lagged behind the steel during the construction of both. The IDS Tower here in Minneapolis also has a concrete core and that was built behind the rest of the stucture, yet supports most of the load.
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Old January 27th, 2009, 04:37 AM   #7320
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WTC #7 is a hybrid skeleton frame, the concrete core is there to protect the stairs and elevators and to add strength. #7 would stand for 100 years without the core, baring fire etc. A building such as Tower One requires a different structural design due to it's height (twice as high as #7).

If, during construction of Tower One, the core lagged behind the erecting steel too far, the erecting steel would give under the load and the tower would collapse. I guess what I am trying to say is that Tower One is unlike any building ever built.
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