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Old March 18th, 2011, 06:42 PM   #20581
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Quote:
Originally Posted by Nomadd22 View Post
Not so much pressure as tension. The concrete is the strength pressure wise and the steel is the strength tension wise. So if you tried to bend the core with a hurricane or airplane, the concrete would be the strength of the opposite side of the bending force and the steel the stregth on the side that was getting pushed. Same with the tower swaying in a quake sort of, except the buildings own inertia is the load.
I'm just guessing, but I think that bolting the floors to the steel frame in the core is a lot stronger than just bolting them to concrete too.
Yes, that too..I don't have experience with professional english words as you guys, but I know what you mean and I tried to explain..I could talk about that way better in my language..
Thanks for the completion..
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Old March 18th, 2011, 06:56 PM   #20582
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Quote:
Originally Posted by mindgoessnap View Post
Dunno if this has been posted or not, but the rebuildgroundzero.com website seems to have been hacked by somebody. The webcam is not available as of this writing.
The link to the webcam itself is here.
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Old March 18th, 2011, 08:15 PM   #20583
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Quote:
Originally Posted by kingsc View Post
Here's a question isn't there another building, beside the shard you dude can compare this to.
It's not like I brought up the Shard to talk about the Shard. I was asking why 1WTC was being built a certain way. If you don't want to read my question, don't come on the forum.
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Old March 18th, 2011, 08:51 PM   #20584
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Quote:
Originally Posted by DinoVabec View Post
Yes, that too..I don't have experience with professional english words as you guys, but I know what you mean and I tried to explain..I could talk about that way better in my language..
Thanks for the completion..
I'm pretty clumsy myself. Zen is the one who actually knows how to put it.
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Old March 18th, 2011, 09:01 PM   #20585
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Quote:
Originally Posted by mindgoessnap View Post
Dunno if this has been posted or not, but the rebuildgroundzero.com website seems to have been hacked by somebody. The webcam is not available as of this writing.
That happens every once in a while i doubt anyone would hack it
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Old March 18th, 2011, 09:06 PM   #20586
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Quote:
Originally Posted by DinoVabec View Post
It's because 1WTC has steel beams in the core..They have to build steel construction first, connect floor beams to them and then they wrap core steel into concrete..It's called reinforced concrete..It's strong as hell..
Most structural concrete is reinforced, more often with rebar than with huge beams, but it's still reinforced concrete.

In any case, that can't be the (only) reason - look at Shanghai Tower. It is going up core-first despite having large amounts of metal (looked to be more than 1WTC) cast inside the concrete core. Looks like they are simply going to connect to the perimeter steel later.


I recall reading a long time ago that in the US (or maybe NY in particular) there is an aversion to slip/jump form on some safety grounds - particularly for working under them. I guess that would pretty much rule out core-first skyscraper construction. I'm not sure if I am remembering that right though, and forum search seems to be broken so can't easily check.
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Old March 18th, 2011, 09:39 PM   #20587
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Quote:
Originally Posted by rda View Post
Most structural concrete is reinforced, more often with rebar than with huge beams, but it's still reinforced concrete.

In any case, that can't be the (only) reason - look at Shanghai Tower. It is going up core-first despite having large amounts of metal (looked to be more than 1WTC) cast inside the concrete core. Looks like they are simply going to connect to the perimeter steel later.


I recall reading a long time ago that in the US (or maybe NY in particular) there is an aversion to slip/jump form on some safety grounds - particularly for working under them. I guess that would pretty much rule out core-first skyscraper construction. I'm not sure if I am remembering that right though, and forum search seems to be broken so can't easily check.
You could be right...Now when I think of other buildings being built in the New York right now, non of them has core build ahead of floors..Carnegie 57, 1WTC, 4WTC...I don't remember seeing the core of Beekman either..There's Devon Headquarters tower in Oklahoma City, no core up there either..
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Old March 18th, 2011, 11:39 PM   #20588
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Quote:
Originally Posted by oilmanjr View Post
It's not like I brought up the Shard to talk about the Shard. I was asking why 1WTC was being built a certain way. If you don't want to read my question, don't come on the forum.
I've been coming to SSC, long before you know what it was. So I'll go where I want when I want.
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Old March 18th, 2011, 11:51 PM   #20589
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Here is a little sketch I made awhile back showing the construction of Tower One and the "erecting steel"
image hosted on flickr


The main difference between core first and steel first construction is in the connection of the floor beams to the core. In core first (usually slip form) construction there are pockets cast into the core walls where the floor beams are set. They are anchored to a bearing plate that was cast into the wall and is held firmly in place with shear studs or rebar welded to the plate. The beams are then either bolted or welded to the bearing plate. Later, after the beams are in place the pocket is filled with concrete. There is absolutely nothing wrong with this method, it is widely used throughout the world, it is cost effective and is usually more than enough. (and it is the method I used when building my house, I didn't want any columns in the way of my model railroad so I used steel beams to support the first floor.)

But we are talking about Tower One here. The exception.

There are three reasons why the core concrete is cast after the steel is erected.

First, bolting the floor beams to the erecting steel that will later be encased in concrete makes a much stronger connection.

Article from Curbed awhile back that shows the core concrete completely encasing those important floor beam to erection steel connections.
http://ny.curbed.com/archives/2010/1...se-new-york-11

Second, by doing it this way the floor beams can be connected with both a shear (gravity load) connection and a moment (Bending load, wind, earthquake) connection.

The third reason is a bit more subtle. At every floor there is a full length dovetail pocket cast into the core wall. This pocket is for the floor slab itself. Rebar extends from the core into the floor slab making the joint even stronger.

The erection steel does reinforce the core concrete but so does the crap load of #11 rebar embedded in it. (#11 is 1 3/8th diameter.)

Last edited by Zensteeldude; March 19th, 2011 at 12:23 AM.
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Old March 19th, 2011, 12:21 AM   #20590
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Quote:
Originally Posted by Draegen View Post
That happens every once in a while i doubt anyone would hack it
I meant to say rebuildgroundzero.org . And yes, as of this writing, if you go to that page it is still down due to a hack. A previous poster put up a direct link to the webcam which is apparently still active.
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Old March 19th, 2011, 03:01 AM   #20591
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Some pics from yesterday and today (3/17/11 & 3/18/11) by me:













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Old March 19th, 2011, 03:11 AM   #20592
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Makes me want to go back.. New york is wonderful
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Old March 19th, 2011, 03:22 AM   #20593
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I know the glazing is not complete but see the sills of the first office floors alternate yet it ends up odd at each end with a double bay ? Just wondering...probably been answered before but although I keep an almost daily look at this thread I haven't heard a comment about it.


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Old March 19th, 2011, 04:07 AM   #20594
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March 16th, TwinTowersForever, Skyscraperpage..



















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Old March 19th, 2011, 05:55 AM   #20595
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Quote:
Originally Posted by redbaron_012 View Post
I know the glazing is not complete but see the sills of the first office floors alternate yet it ends up odd at each end with a double bay ? Just wondering...probably been answered before but although I keep an almost daily look at this thread I haven't heard a comment about it.


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I am sure this has been answered before but. Every other panel has been left out of the "20th" floor for hanging scaffold for work on the base glass brackets.
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Old March 19th, 2011, 06:03 AM   #20596
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Whatever the cladding lacks in reflective quality it more than makes up for in color clarity and brilliance. Superb.
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Old March 19th, 2011, 07:25 AM   #20597
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The glass panels are ultra-clear ones, not reflective.

Michael Morrongiello (March 17, 2011)

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garaventa-nyc (March 17, 2011)

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Old March 19th, 2011, 07:40 AM   #20598
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Madeline68

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Starship Catvern

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Old March 19th, 2011, 07:45 AM   #20599
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Amazing pictures. I wonder the final design is from Libeskind Studio?
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Old March 19th, 2011, 07:51 AM   #20600
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No. Liberskind colaborated with David Childs to do a final project; but once it was done, the New York City Police Department raissed a report wanting a redesign of the entire building. The final design was made by David Childs, from Skidmore, Owings & Merril.
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