Tallest Under Construction Buildings in the World • Hacker News Board

Re: Tallest Under Construction Buildings in the World

#31

Post by seanmcdirmid » Sun, Jan 14, 2018, 4:20 PM UTC

igravious wrote: post #17

holydude wrote: post #6

Earlier quoted context omitted.

Hard to say. There are entire ghost cities in china because people cannot afford to live there. If an economy crisis hits china it’s possible that the entire world is in trouble (though not all countries). These things are hard to predict but china more or less uses local workers and materials. Only companies and people’s investments tied to those companies would in theory be in trouble.

This again. Name even one. Point us to even one "entire" ghost city. Honestly, people will parrot any old thing that sounds dramatic without ever bothering to find out for themselves if it's true.

I doubt Kangbashi is ever going to fill up given how unpopular coal is becoming in china. They might be able to move it to a few hundred K by moving a bunch of government jobs there, but even Donald Trump as president couldn’t get to the few million they built for.

Re: Tallest Under Construction Buildings in the World

#32

Post by e0m » Sun, Jan 14, 2018, 4:47 PM UTC

Here's diagrams of all of the tallest buildings by 2023 (including built ones) visually next to each other sorted by official height thanks to SkyscraperPage: http://skyscraperpage.com/diagrams/?searchID=207

The Skyscrapercenter doesn't include the Dubai Creek Tower which is also already under construction.

Re: Tallest Under Construction Buildings in the World

#33

Post by crdoconnor » Sun, Jan 14, 2018, 4:49 PM UTC

yohann305 wrote: post #3

Do we have someone here that could explain how this could affect the world if/when an economic crisis hits China? (only talking about the building construction)

Financial crises are unlikely to hit China's economic output while it continues to use counter-cyclical fiscal policy and have access to raw materials.

Re: Tallest Under Construction Buildings in the World

#34

Post by ChuckMcM » Sun, Jan 14, 2018, 5:06 PM UTC

ajmurmann wrote: post #12

Do we know what lead to skyscrapers being built? Intuitively I'd think economic prosperity and density. However, Europe has a pretty good economy, is more densely populated than many other regions, yet hardly any skyscrapers to speak of. Do they maybe get built when you need lots of space in the same location quickly? Like when you have a extreme high growth company. Given most skyscrapers are used by several complet…

There was a discussion on that in the New Yorker that sadly I failed to save (it was pre-evernote in my life). But as I recall you are essentially correct in your guess. The calculus was the value of leasing all of the space would return $x, the cost of the land was $y and the cost to build was a function of height. You simply solve for the most money returned.

In San Francisco the cost, with the earth quake requirements, seems to go up fairly quickly and it is hard to get anything approved by the city.

Re: Tallest Under Construction Buildings in the World

#35

Post by ballenarosada » Sun, Jan 14, 2018, 5:16 PM UTC

jostmey wrote: post #15

One very tall skyscraper might be a contra-indicator for economic health, like Dubai. All the wealth is concentrated in a few hands. But lots of tall skyscrapers going up everywhere? Lots of people are accumulating lots of wealth. That's some form of progress

Lots of skyscrapers are also contraindicators, unless you think that there are only like 10 thousand people in society.

Re: Tallest Under Construction Buildings in the World

#36

Post by psyc » Sun, Jan 14, 2018, 5:21 PM UTC

The Burj is the same height AGL as a mountain I used to climb regularly. No matter which way I look at it, I can't shake the perception that the tower is much, much taller than the mountain. I get it that the tower is thin while the mountain is broad, but I still can't perceive them as the same height.

Re: Tallest Under Construction Buildings in the World

#37

Post by myegorov » Sun, Jan 14, 2018, 5:34 PM UTC

ajmurmann wrote: post #12

Do we know what lead to skyscrapers being built? Intuitively I'd think economic prosperity and density. However, Europe has a pretty good economy, is more densely populated than many other regions, yet hardly any skyscrapers to speak of. Do they maybe get built when you need lots of space in the same location quickly? Like when you have a extreme high growth company. Given most skyscrapers are used by several complet…

In the US (Chicago), the invention of the elevator led to progressively taller buildings. Today, elevator technology is still one of the limiting factors of how tall you can build.

Re: Tallest Under Construction Buildings in the World

#38

Post by mabbo » Sun, Jan 14, 2018, 5:34 PM UTC

e0m wrote: post #32

Here's diagrams of all of the tallest buildings by 2023 (including built ones) visually next to each other sorted by official height thanks to SkyscraperPage: http://skyscraperpage.com/diagrams/?searchID=207 The Skyscrapercenter doesn't include the Dubai Creek Tower which is also already under construction.

Is the Dubai Creek Tower freestanding? Or are those lines at the bottom cables for stability?

Re: Tallest Under Construction Buildings in the World

#39

Post by yeukhon » Sun, Jan 14, 2018, 5:38 PM UTC

To be honest, I don’t really understand if there are any practical motivations to race for the tallest building in record.

Re: Tallest Under Construction Buildings in the World

#40

Post by jrs235 » Sun, Jan 14, 2018, 5:40 PM UTC

ChuckMcM wrote: post #34

ajmurmann wrote: post #12

Do we know what lead to skyscrapers being built? Intuitively I'd think economic prosperity and density. However, Europe has a pretty good economy, is more densely populated than many other regions, yet hardly any skyscrapers to speak of. Do they maybe get built when you need lots of space in the same location quickly? Like when you have a extreme high growth company. Given most skyscrapers are used by several complet…

There was a discussion on that in the New Yorker that sadly I failed to save (it was pre-evernote in my life). But as I recall you are essentially correct in your guess. The calculus was the value of leasing all of the space would return $x, the cost of the land was $y and the cost to build was a function of height. You simply solve for the most money returned. In San Francisco the cost, with the earth quake requirem…

Additionally the geography must be able to support sky scrapers. In some places solid stable bedrock is hundreds to thousand+ feet down. This also makes it impractical to build structures beyond a certain height in such areas.