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Megatalls Discussions of projects under construction at least 600m/2,000 ft tall.



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Old April 25th, 2016, 08:44 PM   #1
DubaiM
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DISCUSS | Megatalls of the past, present and future

General Megatall discussion thread!

Hi there,


I created a discussion thread about Megatalls! Since all of the threads here are dedicated to an individual Megatall, there's no place to talk generally about the ongoing projects without getting off topic.
It would therefore provide a great opportunity to start general Megatall discussions!

If I should add an up to date Megatall list to the first post, you can just tell me and I'll add it here. Pictures are very welcome too

Anyway, feel free to discuss about completed, U/C, proposed or visionary projects!

I hope you like the idea!
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Old April 25th, 2016, 08:50 PM   #2
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Old April 25th, 2016, 09:00 PM   #3
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I was wondering how much extra usable space a 600m building has compared to a 300m one. I know the usable space marginal gain falls quite dramatically once total loads and wind twist become a concern, and express elevators are needed (I read somewhere a while ago that a 'standard' boxy 300m building would have only 55% more usable space than a 150m one... due to space losses to express lifts, machine floors etc).

How does this play with megatalls? I know some of them are improper references since they are 'hollow' or conical (like Burj Kahlifa). If we were to build a boxy megatall, though, what could we reasonable expect? 40% more space than a 300m?
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Old April 25th, 2016, 10:12 PM   #4
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That's a good question. To clarify it would help to have the usable floor space of each megatall already build and u/c. And as far as available the data from all other projects in the megatall section.
Without knowing this we can only speculate.
Further every building in the league is so different that a comparison of usuable floor space in relation to the hight is problematic.
I will try to find exact data
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Old April 25th, 2016, 11:15 PM   #5
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CTBUH has data about the gross floor area (GFA). Theese includes room for staircases, elevators, mechinery rooms, lobby and so on...
https://en.m.wikipedia.org/wiki/Floor_area_(building)
More meaningful would be the net internal area (NIA), but data about this are rare.
So i made a list to compare (interesting to know in generally) the megatalls.
Not added = no data
- Jeddah Tower - 1000m - 243,866 mē
- Burj Khalifa - 828m - 309,473 mē
- Suzhou Zhongnan Center - 729m - 500,000 mē
- Wuhan Greenland Center - 636m - 303,275 mē
- Shanghai Tower - 632m - 420,000 mē
- Merdeka PNB118 - 630m - 292,000 mē
- Rama IX Super Tower - 615m - 360,000 mē
- Makkah Royal Clock Tower - 601m - 310,638 mē

It's funny, just the tallest one has the least GFA

And now some buildings less than 600m
- Lotte World Tower - 555m - 304,081 mē
- One World Trade Center - 546m - 325,279 mē
- Guangzhou CTF - 530m - 398,000 mē
- Tianjin CTF Binhai Center - 530m - 252,144 mē
- China Zun Tower - 528m - 437,000 mē
- Guizhou Culture Plaza Tower - 521m - 290,000 mē
- Dalian Greenland Center - 518m -287,000 mē
- Taipei 101 - 508m - 198,347 mē

This lists shows in particular one thing: the GFA in relation to the hight vary extremly. In these hights a comparison isn't reasonable. You can't even say the higher the more space.
And proofs another thing: It's more a question of reputation, building landmarks and the race for the highest building as it has an economic sense.
But to come back to the question here are 5 supertalls about 300m
- Cayan Tower - 306m - 111,000 mē
- The Shard - 306m - 127,489 mē
- Two Prudential Plaza- 303m - 130,063 mē
- Wells Fargo Plaza - 302m - 170,362 mē
- Torre Costanera - 300m - 110,000 mē

And now making an average value for megatalls and compare this for the same average value of buildings about 300m.
The result:
Megatalls ~ 342,000 mē vs. 300m ~ 129,000 mē
I know this construct is very theoretical, but when someone find out the NIA for each building we could make an exact comparison. To sum up i can say that it seens reasonable to build 600m instead of 300m but only when you take a look at the floor space. But not necessarilly to increase the height from 600m to 1000m to have more space.
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Old April 26th, 2016, 05:09 AM   #6
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Good catch!
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Old April 26th, 2016, 07:30 AM   #7
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Sears Tower - 442m 416,000 mē
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Old April 26th, 2016, 01:20 PM   #8
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Former Sears Tower aka Willis Tower is another good example. Not even half the hight of JT but much more space
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Old April 26th, 2016, 02:13 PM   #9
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New York:
- 55 Water Street (209m): 341,000 mē
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Old April 26th, 2016, 06:20 PM   #10
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Funny that Kingdom Tower has the smallest floor area, even though it's twice as tall as some of it's competitors
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Old April 26th, 2016, 07:00 PM   #11
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Where India Tower?
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Old April 26th, 2016, 07:30 PM   #12
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Quote:
Originally Posted by alley cat View Post
Where India Tower?
India Tower is cancelled
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Old April 27th, 2016, 06:45 PM   #13
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I find myself going to the megatall threads more often now that they have a section of their own. Thanks for creating it!
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Old April 27th, 2016, 07:59 PM   #14
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I wonder when the next "super-tower" that is tall not because tall, but because the massive density is necessary/cost effective, will be built. We see some of it the super high/low unit towers in NYC.

Costs will have to come down a lot. 3D printed concrete?
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Old April 27th, 2016, 08:44 PM   #15
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The reason KT has so much less space than others is because of its Gigantic spire, and its big Core. (The Spire is almost one third the building's height!)
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Old April 27th, 2016, 09:42 PM   #16
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Yes KT is the King of spire
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Old April 28th, 2016, 02:02 AM   #17
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I don't want anyone to understand me wrong but Jeddah Tower is not meant to be usable in anyway .. it is nothing more than a slender version of Burj Khalifa and it adds nothing but a record breaking height to the record books, which I don't mind

I got one question in mind, am I wrong or Burj Khalifa was the first ever tower built with a buttressed core? or there was others before it?
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Old April 28th, 2016, 03:32 AM   #18
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Quote:
Originally Posted by Gabriel900 View Post
I got one question in mind, am I wrong or Burj Khalifa was the first ever tower built with a buttressed core? or there was others before it?
Indeed, Burj Khalifa was the first buttdress core tower. At least when you can trust wikipedia.
William F. Baker was the structural engineer of BK and has invented this princip to make new hight records possible.
https://de.m.wikipedia.org/wiki/William_F._Baker
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Old April 28th, 2016, 05:29 AM   #19
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There's the humble Ryugyong Hotel tower which has a buttressed core.
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Old April 28th, 2016, 04:43 PM   #20
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Wow, I thought a megatall thread is just all talk and nothing much.


It exist!!


And to see so many mega tall save me alot of time searching what are the tallest projects ongoing currently.



Its the good start to the right direction.
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