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Old July 31st, 2012, 05:27 PM   #1841
babybackribs2314
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Construction update from this weekend. The podium is massive looking already, even if construction does halt for a while.

175 Greenwich Street: July 2012 Construction Update
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Old August 1st, 2012, 02:54 AM   #1842
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Development progress is definitely unbelievable. I am exited to see this skyscraper. Cant stop any more...
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Old August 1st, 2012, 09:23 AM   #1843
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great to see so much steel rise already , go 3wtc!
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Old August 2nd, 2012, 04:43 AM   #1844
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sorry if this is an old question why was 3 wtc shortened?
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Old August 2nd, 2012, 06:13 AM   #1845
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It's not shortens theyre only building to 8 floors until they can secure a tenant of 400,000 square feet I do believe.
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Old August 2nd, 2012, 06:21 AM   #1846
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Quote:
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sorry if this is an old question why was 3 wtc shortened?
$$$
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Old August 2nd, 2012, 06:52 AM   #1847
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Quote:
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It's not shortens theyre only building to 8 floors until they can secure a tenant of 400,000 square feet I do believe.
It was indeed shortened. The original design had cross-braces and was slightly taller, but it was simplified a few years ago to the current design.
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Old August 2nd, 2012, 06:52 AM   #1848
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sorry if this is an old question why was 3 wtc shortened?
It hasn't been shortened . It's simply not going to be constructed from beginning to end in one go .
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Old August 2nd, 2012, 08:30 AM   #1849
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It hasn't been shortened . It's simply not going to be constructed from beginning to end in one go .
Wrong. One office floor and two mechanical floors we removed in the same stroke that removed the cross bracings to make the building cheaper to build, so that it could be built sooner. It was originally going to be 1240 ft tall with the x-bracings, now it's 1170 ft with no x-bracings, not much of a difference. But still a difference.
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Old August 2nd, 2012, 12:38 PM   #1850
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Here is the current design and the old design

[IMG]http://i50.************/5xtttv.png[/IMG]
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Old August 2nd, 2012, 02:32 PM   #1851
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I may have asked this a while back but anyway, I thought cross bracings were an efficient form of supporting a buildings core. Does anyone know if I am right in some cases or wrong all together?
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Old August 2nd, 2012, 03:05 PM   #1852
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I think cross bracings are a good support against the bending forces of wind loads. I think normal beams are better for supporting the weight of a tower. Though plz keep in mind that this all is just speculation of a nonengineer
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Old August 2nd, 2012, 04:05 PM   #1853
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Your observations make sense. I was just confused because in other cases I have seen (or as I remember) crossbraces used to keep the cost of a building down. And in this instance, being removed to fit a budget. I guess it all depends.
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Old August 2nd, 2012, 05:03 PM   #1854
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$$$
Indeed, and it has me worried that we could see cheapening of 2WTC's design like we did with 3WTC and 1WTC's mast.
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Old August 2nd, 2012, 06:46 PM   #1855
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Cross Braces would be for torsion and crippling strength

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I think cross bracings are a good support against the bending forces of wind loads. I think normal beams are better for supporting the weight of a tower. Though plz keep in mind that this all is just speculation of a nonengineer
The cross braces would increase torsion strength. Not sure it would matter with the asymmetric design of the building. The cross braces look mostly cosmetic. For crippling the cross braces could redistribute load if there is a localized failure/highly loaded office space (redundant load path). Architects design buildings, not engineers; so many elements of the design are cosmetic. There are very few cosmetic things on a airplane which are designed by engineers.
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Old August 2nd, 2012, 07:57 PM   #1856
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What is the difference between shear strength and torsion strength? To me, from what I know, it looks like torsion is just one possible way in which shearing can occur, am I right or not?
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Old August 3rd, 2012, 05:15 PM   #1857
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Quote:
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What is the difference between shear strength and torsion strength? To me, from what I know, it looks like torsion is just one possible way in which shearing can occur, am I right or not?
Shear strength is related to the strength of the structure to resist the sliding failure of the structure parallel to the direction of the load. Shear strength is pure material/structure strength.

Torosion strength is the ability of the structure to take a twisting load. With large tall buildings the wind becomes a big factor in loading the building. The building will have different modes related to the torsion and bending stiffness of the structure. I related Torsion strength and stiffness as the same general term. Adding cross braces will change the torsion stiffness and change the vibration frequency of the modes. Hopefully the building will be built such that the damaging modes will be avoided however it does not mean the building will not twist or bend in the wind. (Most building designs will make sure their modes/natural frequencies will not occur in winds 0-150 mph).

The John Hancock building in Boston had a problem with the glass falling off whenever wind speed reached 45 mph due to poor torsion stiffness. They had to retrofit the build with new glass/attachement system and add a tuned mass damper. The mass damper was added partially to help the people in the building since the vibrations were making them sick.
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Old August 3rd, 2012, 08:55 PM   #1858
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Thanks for the info So if I understand it right, shear strength is the strength of the material against a shear load and torsion strength is the property which determines how the tower will bend and absorb or not absorb wind loads, right?
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Old August 3rd, 2012, 09:03 PM   #1859
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Quote:
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Here is the current design and the old design

[IMG]http://i50.************/5xtttv.png[/IMG]
Ughhhh. Every re-design always serves to make it smaller or less interesting. Totally sucks.

What was the roof height on the original and what is the roof height on the current one?
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Old August 3rd, 2012, 09:05 PM   #1860
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Original was 350 meters, new one is 327 meters
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