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Old November 18th, 2013, 11:28 PM   #2281
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Quote:
Originally Posted by patrykus View Post
It has:

1. Outer perimeter structure (green - 60 steel columns )
2. Inner perimeter structure (red - 32 steel columns)
3. Structural walls going inside the building (blue - 12 steel columns)
4. Steel trusses inside each floor
5. Pyramidal more stable structure.
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Originally Posted by keber View Post
You cannot compare small building to megaskyscraper. It is not comparable at all.
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Originally Posted by patrykus View Post
You asked me what this tower have so I answered. This model is cut out section from the final design of the tower.
I have no doubt too, that this structure is much more stable and resistant than typical, one-core building approach - but only when we compare the same type of material. The question is - if traditional building with concrete core would be worse than broad structure, but made from steel?
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Old November 27th, 2013, 02:45 PM   #2282
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Quote:
Originally Posted by crriss View Post
The picture from the post above is very useful to discuss about this controversial construction method, if is possible or not. I am not Structural Engineer, but EE, and I studied a bit of mechanics and I can say that I understand what happens in the picture above. At a first impression that crane has at least 30-40 tonnes without any load lifted. there are complex forces which act from crane support mast to building structure, both static and dynamic. first is a vertical component with a value almost equal with the weight of the crane plus load then there is lateral force which either pull or push the upper support depending on the position of the crane boom and if there is weight lifted of not. then is a shear force at the upper support created by the weight variation from load/unload condition. added to this there are forces caused by wind, weight lifting, load or unload as well oscillations of the mast, counterweights and the whole assembly.
All these forces are huge, with order of magnitude within 300-600kN or probably more in the worse case conditions. Suppose that the building from the previous post is made of prefabricated materials and no concrete or very little must be poured, it has to rise in record time and concrete takes at least few weeks to settle and gain it's default strenght, usually 28 days but we don't have that time, as we can see the building is rising few floors per day or per week ? then the floor slab seen on the trailer truck as well as underneath supporting beams are way too thin and fragile to be have enough tensile, bending and twisting strength to support the crane which is fixed on the outside wall. even the exterior wall which carries the vertical component of the weight might not be strong enough. It has probably thick steel piles but even so the structure is not robust enough because the upper side is unfinished yet and there is no closed polygon for return forces...
If I'm missing something, please someone clarify.
This frame has an interlocking structure of columns, beams and trusses to return the shear force.
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Old December 2nd, 2013, 02:48 AM   #2283
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The smaller 401m building has restarted! THIS IS NOT SKY CITY though
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Old December 2nd, 2013, 02:52 AM   #2284
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Old December 2nd, 2013, 08:59 AM   #2285
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Good news anyway, what is the point of the smaller building?
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Old December 2nd, 2013, 10:47 AM   #2286
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The 401m tower it's just a rumor by the moment. Almost no info yet.
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Old December 2nd, 2013, 12:37 PM   #2287
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Quote:
Originally Posted by z0rg View Post
The 401m tower it's just a rumor by the moment. Almost no info yet.
The smaller tower is 401 meters high?
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Old December 2nd, 2013, 01:32 PM   #2288
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As you can read.
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Old December 2nd, 2013, 01:41 PM   #2289
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The thread in the U/C section says 349m though...?
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Old December 2nd, 2013, 02:06 PM   #2290
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Isn't it the case that with this kind of building method the builders could just stop half way, add a roof and call it finished? Or on the other hand make it a couple of floors taller.

Making it harder for us to put it in the right section.
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Old December 2nd, 2013, 03:04 PM   #2291
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Quote:
Originally Posted by droneriot View Post
The thread in the U/C section says 349m though...?
401m was the alleged height fabricated by rumor makers a few months ago, when the project wasn't even real.
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Old December 2nd, 2013, 03:22 PM   #2292
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401 meters or 349 meters it's pretty tall for a SMALLER building. There are plenty of people on the planet who haven't even seen a building of that height including plenty in so called developed countries.
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Old December 2nd, 2013, 04:37 PM   #2293
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Well, most developed countries are stuck in the so called 20th century trap. Cell phnones and other gadgets aside, they look exactly the same as in the 90s. Very few non Asian countries are truly living the 21st century.
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Old December 2nd, 2013, 04:53 PM   #2294
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I don't think there is much political will to consider new ideas even in China, which built a high-speed rail network even though they HAVE maglev technology, which is faster, more efficient, less noisy, cleaner, and cheaper to maintain. It probably has to do with the fact that politicians are generally over 200 years old and suffer from advanced dementia.
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Old December 2nd, 2013, 04:58 PM   #2295
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Are you kidding? Everything gets reformed every 10 years or even more frequently. China was in the catch up phase and now can start to push unique ideas of its own, like in this very thread. The most extensive hsr system in the world is nothing to be unproud of.
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Old December 2nd, 2013, 05:00 PM   #2296
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Quote:
Originally Posted by droneriot View Post
I don't think there is much political will to consider new ideas even in China, which built a high-speed rail network even though they HAVE maglev technology, which is faster, more efficient, less noisy, cleaner, and cheaper to maintain. It probably has to do with the fact that politicians are generally over 200 years old and suffer from advanced dementia.
Oh mighty maglev professor,bless us!
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Old December 2nd, 2013, 05:09 PM   #2297
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Quote:
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Are you kidding? Everything gets reformed every 10 years or even more frequently. China was in the catch up phase and now can start to push unique ideas of its own, like in this very thread. The most extensive hsr system in the world is nothing to be unproud of.
I haven't felt the world was making progress for quite a while. We still fire coal for electricity, run our cars on petrol, ride on decrepit trains, fly with planes that have used the same technology for many decades, waste our opportunities in space (can't even get a guy on the Moon since 1972), we mothball all promising projects, we haven't made any progress on curing hundreds of illnesses that affect millions, hundreds of millions are malnourished, water is depleting, sea levels rising, education systems eroding, species going extinct by the thousands, and so forth. So now we build taller buildings than ten years ago. Big whoop. We're still living in the past in almost every other area.
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Old December 2nd, 2013, 05:22 PM   #2298
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Well, China is making very fast progress, and it's where I expect the big ideas for the future to come from

I think you are a little pessimistic. This website we're on is enabled by new technology that's less than 30 years old. Yes most of the gains in technology recently have been for communication but instant global communication is an absolutely huge deal and leads to even faster breakthroughs in the future.
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Old December 2nd, 2013, 07:04 PM   #2299
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i hope the pictures are really for a building over at least 200m! Broad is letting us wait for something bigger than there usual buildings for a long time now. they should give us something that we can believe in and build it as fast as they promised. a supertall would be a nice start :p
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Old December 2nd, 2013, 10:07 PM   #2300
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Quote:
Originally Posted by KillerZavatar View Post
i hope the pictures are really for a building over at least 200m! Broad is letting us wait for something bigger than there usual buildings for a long time now. they should give us something that we can believe in and build it as fast as they promised. a supertall would be a nice start :p
yes, would be great if they would show us that they can build a supertall in just a few months.
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