NEW YORK | One World Trade Center | 1,776' Pinnacle / 1,373' Roof | 108 FLOORS - Page 404

Zensteeldude · #**8061** Posted **Mar 20, 2010, 2:07 AM**

Quote:

Originally Posted by NYC4Life

The first building in the new WTC complex to receive — Certification

Zensteeldude · #**8062** Posted **Mar 20, 2010, 2:15 AM**

Quote:

Originally Posted by hammersklavier

Am I not the only one who is struck by the fact that it looks like the construction methods on this building is something of a throwback? Unlike many other modern skyscrapers, which are almost entirely built of reinforced concrete, it looks like 1 WTC is being built with traditional "internal steel skeleton" methods around a somewhat more-modern core.

Could this be a reaction to the fact that the structural failure in the original complex was due to the easily-melted support lattice trusses in the original tubular tower design?

Nothing melted on 9-11-01 other than the aluminum of the planes. The structure of Tower One is based on sound design from lessons learned about the Twins failures.

It's sounds to me like you know just enough about engineering to be dangerous, or you spent too many hours at those silly 9/11 truther sites..

I'm an NJIT Grad with an MS in Structural Engineering and 20 years experience and a full set of prints for Tower One, and the Memorial, and the Transit Hub, and the ARC Tunnels . . . . .among other things.

2-TOWERS · #**8063** Posted **Mar 20, 2010, 2:16 AM**

The Next Floors Completed, We Should Start To Notice The Angle

Zensteeldude · #**8064** Posted **Mar 20, 2010, 2:20 AM**

Once the third, and last, pick of the corner nodes is in we should really be able to see the angle.

In the next pick the corner nodes we split into 3 columns.

BStyles · #**8065** Posted **Mar 20, 2010, 2:46 AM**

My three pics from today. (large images)

Zensteeldude · #**8066** Posted **Mar 20, 2010, 3:00 AM**

MMMMMMMMMMMM, steel — !!!!

Nice shots BStyles !!!

2-TOWERS · #**8067** Posted **Mar 20, 2010, 9:13 AM**

amazing pics........................wow !!!!!!!!!!!!!!!!!!!!

Spud · #**8068** Posted **Mar 20, 2010, 9:15 AM**

Quote:

Originally Posted by Domamania

can you please translate what MPA means, Thank you.

As stated by someone else, MPA is the metric version of PSI. To find out how strong a particular concrete mix can be expected to be they take a sample and find out how much pressure it takes to crush it. We also have hand held devices that can test concrete on site.

I'm not sure of the metric to imperial conversion but a domestic house slab here is usually 17.5mpa, a commercial concrete floor in a high rise is 30mpa, structural beams and columns are 40mpa and a crane base is 50mpa. This is bearing in mind that our buildings are designed to withstand a cataclysmic earthquake (over 8.5 on the richter scale) which can be expected every 150 years or so. (The last one was 150 years ago.)

Fortunately New York does not experience cataclysmic earthquakes. From my rather limited understanding of the engineering design considerations for a super tall high rise such as the freedom tower it is wind loading that is the main concern. I think someone else mentioned that in some cases the wind could be expected to cause some of the columns to be in tension which is quite an alarming thought when you consider what must be happening to the columns on the other side of the building!

At any rate, I hope one day to visit this amazing structure.

Spud · #**8069** Posted **Mar 20, 2010, 9:33 AM**

Quote:

Originally Posted by hammersklavier

Am I not the only one who is struck by the fact that it looks like the construction methods on this building is something of a throwback? Unlike many other modern skyscrapers, which are almost entirely built of reinforced concrete, it looks like 1 WTC is being built with traditional "internal steel skeleton" methods around a somewhat more-modern core.

The corner columns are beautifully angled inwards so as, I presume, to help brace the structure. This looks rather sophisticated to me.

Perhaps the choice of steel could have something to do with economics. In my city the price of structural steel went through the roof a few years back so a lot of buildings have been built out of concrete recently. Maybe the inverse applies in New York? Does anyone here know why they chose steel over concrete?

canadate · #**8070** Posted **Mar 20, 2010, 1:37 PM**

Thanks for the compliments the other day, they're always appreciated. I have those photos I promised that day too. I said it'd be within the next month but I felt up to it yesterday and decided to knock it out. Here they go..

There goes my shot looking vertical between the Verizon and Tower 1...Won't see that for a long time.

New Gate

BiggieSmalls · #**8071** Posted **Mar 20, 2010, 1:40 PM**

Quote:

Originally Posted by Zensteeldude

and a full set of prints for Tower One, and the Memorial, and the Transit Hub, and the ARC Tunnels . . . . .among other things.

The ARC Tunnels..? Is there a thread on that? That has to be one of the great under the radar projects.. \

NYguy · #**8072** Posted **Mar 20, 2010, 1:43 PM**

^ It's only under the radar because the focus has been on the Moynihan Station development. There should be more info in the transit forum. There were some updates in the old Moynihan thread though.

Quote:

Originally Posted by canadate

Great shots. I can already feel 7 WTC becoming eclipsed.

canadate · #**8073** Posted **Mar 20, 2010, 1:52 PM**

Quote:

Originally Posted by NYguy

Great shots. I can already feel 7 WTC becoming eclipsed.

Thanks a lot! And yeah, I think about that a lot but for some reason it's hard to believe. 7 already seems tall..This tower is going to be more than twice the height! Can't wait till 1 passes it!

Indescribable · #**8074** Posted **Mar 20, 2010, 4:08 PM**

Is the lobby of 7WTC always lit up like that?

evanmack · #**8075** Posted **Mar 20, 2010, 4:19 PM**

Quote:

Originally Posted by Indescribable

Is the lobby of 7WTC always lit up like that?

Yes it is, most of the time at least...

MadGnome · #**8076** Posted **Mar 20, 2010, 7:43 PM**

It looks like they're laying 22 before 21. Is that how they're going to do the floor a week trick? Just lay even number floors to start and follow up with the odd floors?

uaarkson · #**8077** Posted **Mar 20, 2010, 7:52 PM**

Quote:

Originally Posted by MadGnome

It looks like they're laying 22 before 21. Is that how they're going to do the floor a week trick? Just lay even number floors to start and follow up with the odd floors?

wat

BStyles · #**8078** Posted **Mar 20, 2010, 8:40 PM**

No, you lower steel and decking onto the floor and place decking last for the even numbered floors. As you can see, the 20th floor is currently getting decking.

They completed two floors in one week?! Wow!

uaarkson · #**8079** Posted **Mar 20, 2010, 9:43 PM**

It's been almost two weeks since they started putting up new core steel, but considering they didn't hang steel for the better half of last week as a result of rain, you could say the speed has been very good.

meh_cd · #**8080** Posted **Mar 20, 2010, 9:56 PM**

Either way, we've already done the hard part. Now the farther we go up, the smaller the floor plates. However, that also means the cranes will take more time to deliver the material for each floor. I wouldn't say we're in the home stretch quite yet, but if we reach the 50th floor by the end of this year I'll be more than pleased.