NEW YORK | One World Trade Center | 1,776' Pinnacle / 1,373' Roof | 108 FLOORS

[Puzzlecraft]

Two more columns to go, one on either side of the West portal.

[Zensteeldude]

Originally Posted by wong21fr

^Something about New York City construction guidelines. The core can't rise above the rest of the building during construction.

Isn't it a union issue?

No.

[Zensteeldude]

Originally Posted by wong21fr

Yeah, I should have mentioned the mechanical elements. I didn't realize that 1 WTC also had ventilation tunnels for the PATH, that's pretty interesting.

However, with blast walls and blast resistant paneling, the description "bunker" does work. While it's not a true bunker the additional blast resistant elements certainly earn a better moniker than "force protection". Bunker sounds better.

How about "terror resistant".

PS: This is a bunker ! Looks nothing like Tower One does it.

[iamtal]

Originally Posted by Zensteeldude

The "bunker" is a myth invented by the media. Tower One is designed to withstand 2 things the Twins never were. One, a 5.0 earth quake and two, a force 4+ hurricane. Either one of these well put more stress on the tower than terror.

Are you sure about the magnitude level? 5.0 is a very moderate earthquake. Modern buildings are built to withstand 7.0 ML earthquakes at least.

[BStyles]

Originally Posted by SD360

I have seen supertalls in the construcion phase where the core rises above the floors, but why isn't this one doing it?

Actually the steel has to be connected to the core, and then concrete is formed around the joints. It's actually stronger than connecting it to pre-made concrete.

Originally Posted by iamtal

Are you sure about the magnitude level? 5.0 is a very moderate earthquake. Modern buildings are built to withstand 7.0 ML earthquakes at least.

New York City has little or no earthquakes, that's probably why the protection factor is so low. But anything can happen, so you have a point.

[Zensteeldude]

Originally Posted by iamtal

Are you sure about the magnitude level? 5.0 is a very moderate earthquake. Modern buildings are built to withstand 7.0 ML earthquakes at least.

Modern buildings in LA or Tokyo. A 5.0 in New York would be like an 8.0 in LA. Up untell a few years ago there were no seismic requirements for buildings in the tri-state area.

As BStyles pointed out New York is not a seismically active area, the largest quake on record in New York State was a 5.8 but that was well upstate near Canada. Hurricanes on the other hand are more likely and a strong one hitting New York is just a mater of time. New York has had several near hits in the last 100 years.

seismic hazard map.


California map for compairson.

[canadate]

Thanks to all of you I really appreciate the compliments. Seeing all the positive replies was very surprising..didn't think I would be good enough. I actually want to become a professional photographer so this is great motivation for me. But my main purpose for doing this is to give back to you all..I've been coming to this site for a couple of years now and a lot of you on here have been helping me to understand everything that's going on at the WTC as well as other projects that have been going on. It's a great thing to be able to see all of you discuss architecture..many people don't appreciate it..especially a lot of the people that live here..I hate the fact that they take having all of these amazing buildings for granted I didn't have all of this where I came from in Jersey. But anyway, sorry to get all sappy. haha. I look forward to bring you all more updates..thanks again for the welcomes and the kind replies..it's an honor to be able to communicate with you all.

[NYguy]

Originally Posted by canadate

Thanks to all of you I really appreciate the compliments. Seeing all the positive replies was very surprising..didn't think I would be good enough.

Any photos would be appreciated. There are daily updates at the construction site, but unfortunately all of us can't be there everyday. Any chance to take pics is a plus for us.

[Puzzlecraft]

From GreenwichBoy on Wired:

http://wirednewyork.com/forum/attachment.php?attachmentid=7771&d=1256300984

It does look like the vertical cables at the back of the Manitowoc 18000 would come very close oto the West portal cross beam if installed, should the 18000 then face the West.

That the last column in the SW corner was skipped before the NW corner was work on seems to indicate this.

Yet another development to monitor...

[NYguy]

Assuming you are referring to this, originally posted on wirednewyork.com...

We'll see all of the lower columns in before we get to that, but its pretty accurate looking.

A look at how we're doing...

Originally Posted by iamtal

[Pizzuti]

I'm really surprised they'd cut those beams in the middle or build them up in segments rather than installing them all at once (I'm talking about the diagonal beams that dead-end at the top of the outer wall).

Man, everything about this building is counterintuitive.

[uaarkson]

On the outside it seems counter-intuitive, but I have faith that these people know exactly what they're doing.

[RockMont]

Originally Posted by uaarkson

On the outside it seems counter-intuitive, but I have faith that these people know exactly what they're doing.

I would think they would have at least as much knowledge of what they are doing, as the folks that built the originals.

[jddar]

Originally Posted by Pizzuti

I'm really surprised they'd cut those beams in the middle or build them up in segments rather than installing them all at once (I'm talking about the diagonal beams that dead-end at the top of the outer wall).

Man, everything about this building is counterintuitive.

Those would be some really long and heavy beams if they did that. Would that even be possible? Aren't they welding the beam joints with the method being used?

[westmc9th]

so 2 columns left do you think they will be up next week>??|

[Zensteeldude]

Originally Posted by Pizzuti

I'm really surprised they'd cut those beams in the middle or build them up in segments rather than installing them all at once (I'm talking about the diagonal beams that dead-end at the top of the outer wall).

Man, everything about this building is counterintuitive.

If you look closely at this pic of the south side you can see the column splices. The columns and diagonals well be put up in 4 lifts. (the first lift is up on the east side)
Also notice that the two center columns on this side of the building lean inward. (The vertical beam in the center above the entrance is not a column, it's a hanger) The south entrance is much wider than the others and they have to bring the columns back in line with the main column grid.



PS: the engineers that designed Tower One have something the designers of the Twins never had, computer aided design.

[Puzzlecraft]

All of the columns have splices, except for the one going up from the right side of the portal (5th column in from the right of the 13). Why do you think this is?

[Zensteeldude]

I don't see what you mean, all the columns and diagonals have splices.

[wong21fr]

Originally Posted by Zensteeldude

No.

What is the reason that the core cannot rise above the rest of the structure in New York City then?

[Zensteeldude]

I think you are reading too much into it. The structural design dictates if the core rises ahead of the floors or vis versa. There is no building code or union rule.

PS: when the Twins went up the core was ahead of the floors and perimeter.