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



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Old October 21st, 2016, 07:59 PM   #15921
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Quote:
Originally Posted by KillerZavatar View Post
I rather have a 650m building with a huge as spire on top than a 650m building without a huge as spire :P
It has to be according to the building design. If the building is a spike or an obelisk - it needs no spire, it is like a spire itself (JT, PAFC). If the building is a box - it would better have nothing bulky on the roof (it has a very valuable roof area - like WTC 1 &2) or a few simple geometric elements (Fairmont SZR). If it's a composition of forms - it can be stylish (Chrysler building, Empire State). If the building has a free-form shape, it's not an architecture, it's a sculpture (and a total disaster for construction, safety and maintenance).
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Old October 21st, 2016, 11:39 PM   #15922
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Only 167 floors is stupid ? Really ?
No , the 336 m spire
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Old October 22nd, 2016, 06:17 PM   #15923
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Old October 23rd, 2016, 04:42 PM   #15924
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Quote:
Originally Posted by AP Design View Post
It has to be according to the building design. If the building is a spike or an obelisk - it needs no spire, it is like a spire itself (JT, PAFC). If the building is a box - it would better have nothing bulky on the roof (it has a very valuable roof area - like WTC 1 &2) or a few simple geometric elements (Fairmont SZR). If it's a composition of forms - it can be stylish (Chrysler building, Empire State). If the building has a free-form shape, it's not an architecture, it's a sculpture (and a total disaster for construction, safety and maintenance).
i second your statement - and while PA(I)FC is (a bit) boxy, not that many supertalls above 400m and especially megatalls (i know it scratches the designation, but to me it is one seeing MRCT counting to them), (will) have such a high percentage of (even usable) big floorspace of their full architectural height:

PAFCs highest occupied floor at 561.7 m (of 589.4m to its primary roof according to skyscraperpage of 598.9m to tip) equates to 93.8%, where Goldin Finance 117 could get the highest ratio and lowest vanity height of over 400m tall supertalls since old 2 WTC (411m of 415.1m @99%) at 584.1m of 596.5m, which would be 97.9%...

to compare vanity heights of some megatalls (occupied/occupiable height percentage using CTBUH specs):
Jeddah Tower 637.5m:1000-1100?m @~58% minimum (637.5m:1100m) to @~63.8% maximum (637.5m:1000m)
Burj Khalifa 584.5m:828.9m @70,5%;
Wuhan Greenland Center 575m:636m @90.4%
Shanghai Tower 561.5m:632m @88.8%
Makkah Royal Clock Tower 494.4m:601m @~82.3% (clock interior taking out potential floorspace)


PAFCs "spire" is included, it even has multiple spires and multiple main body shapes depending if you see some parts as cutouts or hybrids
if one would continue some architectural lines, they could get extremely or very tall with imaginary spires

the primary inner body (with the 3 cross bracings on the 4 edges separated by the four megacolumns and their cladding) has "cutouts" from about 410m on, the edges go as inclined flats (which are my favourite design element of this building) until the height of the prominent edge at above 555m, while the main shape follows the megacolumns above that edge, where the observation glass plates should be, until the primary pyramid rooftop, while the megacolumns continue to the secondary pyramid, the architectural tip

i just love the design and while i would have changed the top part slightly and maybe some elements at the base the people involved did a good job imo

such a good looking rectangular design isn't seen often am i right? the different angles at the edges and the contrast of the material, dim horizontal and bright vertical and crossing lines (aluminum?)... make this one of my favourite skyscrapers - also the interior is looking superb as far as i noticed (maybe top tier office with modern design in wood?) - the observation decks also add a nice bonus and its as far as i know unique rectangular glass tiles that go out a bit of the floors perimeter to look down on the side between the facade lines above the prominent edge

Glad to read that more people think of PA(I)FC as an Obelisk (which isn't hard to notice), the tallest yet

and excuse my bad english
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Old October 26th, 2016, 01:42 PM   #15925
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Old October 26th, 2016, 04:12 PM   #15926
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such a good looking rectangular design isn't seen often am i right?
Absolutely! And I'm really surprised that AS+GG didn't make the JT's wings perfectly rectangular in their plan.
However, we could not expect JT to have all-rectangular cross-shaped plans, because according to Islamic traditions they have to avoid any kind or perpendicular crosses in architecture. So a more rational design, similar to PAFC would be rejected, regardless of how much better it can be.
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Old October 26th, 2016, 09:25 PM   #15927
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Quote:
Originally Posted by Meehoowk666 View Post
to compare vanity heights of some megatalls (occupied/occupiable height percentage using CTBUH specs):
Jeddah Tower 637.5m:1000-1100?m @~58% minimum (637.5m:1100m) to @~63.8% maximum (637.5m:1000m)
Burj Khalifa 584.5m:828.9m @70,5%;
Wuhan Greenland Center 575m:636m @90.4%
Shanghai Tower 561.5m:632m @88.8%
Makkah Royal Clock Tower 494.4m:601m @~82.3% (clock interior taking out potential floorspace)
A little reminder: if the vanity height of a building gives a height percentage of under 50% of usable space, the structure will be known as a tower and not a building anymore, which will sooner or later lead to some really funky classifications.
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Old October 28th, 2016, 04:17 AM   #15928
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only on ssp or on every source?
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Old October 28th, 2016, 02:48 PM   #15929
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Quote:
Originally Posted by AP Design View Post
Absolutely! And I'm really surprised that AS+GG didn't make the JT's wings perfectly rectangular in their plan.
However, we could not expect JT to have all-rectangular cross-shaped plans, because according to Islamic traditions they have to avoid any kind or perpendicular crosses in architecture. So a more rational design, similar to PAFC would be rejected, regardless of how much better it can be.
excuse me if i have to ask you to specify what you excatly meant by rectangular: the shape of the sides that go up to the spire if you look at the flats when standing in front of the tower, or the cross-section of the wings in the floorplan? i didn't realize, that they weren't rectangular (at the extension, i don't mean a cross shape of the whole structure), do you mean the wing floorplans outer wall by itself being slightly off 90° from the wing line? Thanks for your feedback!

(i know that you, AP, are aware of everything i explain, but maybe some readers don't) I guess, it is a compromise, if you want to build that tall and save costs and material, you need a y-shaped design with at least some triangle-form in the structure, as we see in Burj Khalifa, Wuhan Greenland Center and Jeddah Tower, but you'll sacrifice potential floorspace

the buttresses and less mass in higher places due to the tapering help to stabilise against the wind and by the Y-shape you can also better deescalate vortices, what RWDI designed so well for the Burj Khalifa (i didn't know, that they also desing tuned mass dampers, of which no one is needed in BK though)

those turbulences would shape around edges behind a wind flow as this engineer in the making explains easily https://www.youtube.com/watch?v=niVguabIhTs

I wonder how tall one could build safely today with as wide wings as the Ryugyŏng Hot’el (Yu-Kyung Hotel) in Pyongyang has. If i remember correctly, those are about 100m long(from the center or core?), each! (360.000m² in a y-shaped 330m supertall can only be explained by this huge width)... how wide were the wings of Jeddah tower? i bet not more than, if even, 50m

Last edited by Meehoowk666; October 28th, 2016 at 02:58 PM.
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Old October 29th, 2016, 08:42 AM   #15930
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Old October 29th, 2016, 12:35 PM   #15931
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Old October 29th, 2016, 10:47 PM   #15932
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I think there'll be new informations on November
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Old October 30th, 2016, 06:36 PM   #15933
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Old October 31st, 2016, 04:05 PM   #15934
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Old November 2nd, 2016, 03:52 PM   #15935
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Can't wait for the 200 meters mark
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Old November 2nd, 2016, 04:20 PM   #15936
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It seems slowly again
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Old November 3rd, 2016, 10:29 PM   #15937
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Floor 47, sure ??

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Floor 47, sure ?? This building, 47 cms. per month will be finihsed in the
year 2147.
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Old November 3rd, 2016, 11:42 PM   #15938
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Hi all.

The structure is up to the floor of level 48 at 197.925 meters above the floor of level B1Mezz.

The section plan shows small mezz. levels above levels 15 and 39 that I would presume to be named level 15Mezz. and level 39Mezz. respectively. These levels are not technically skipped in the naming scheme but take the place of levels 16 and 40. These levels cannot be seen when doing a level count on the structure and therefore levels 16 and 40 seem to be skipped.


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Old November 4th, 2016, 12:48 AM   #15939
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Hi all.

The structure is up to the floor of level 48 at 197.925 meters above the floor of level B1Mezz.

The section plan shows small mezz. levels above levels 15 and 39 that I would presume to be named level 15Mezz. and level 39Mezz. respectively. These levels are not technically skipped in the naming scheme but take the place of levels 16 and 40. These levels cannot be seen when doing a level count on the structure and therefore levels 16 and 40 seem to be skipped.


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Old November 4th, 2016, 01:44 AM   #15940
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