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Chinese Firm Approved To Raise World's Tallest Building In 90 Days
kkleiner writes "The long anticipated Chinese construction project called Sky City, a 220-story building that can house 30,000 people, has finally received approval from the central government to break ground. The firm Broad Sustainable Building previously constructed a prefab 30-story building in 15 days, but for Sky City, they have an even more aggressive schedule: 90 days to build 2,750 feet into the air. Once completed, the building will be a place for people to both live and work, with recreational facilities, theaters, a school, and a hospital all within the structure."
"Arcology" is the term of reference...
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The Fine Article is a full year old. On October 17 2012 the very same source reported that the firm revised its plans, pointing to a more reasonable (but still very short) 210 days construction time. http://inhabitat.com/worlds-tallest-skyscraper-to-be-built-in-210-days-instead-of-90-as-originally-planned/
Nuffsaid
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Don't know about his cat, but Schroedinger is definitely dead.
IAAASE (I actually AM a structural engineer) and I am definitely concerned. Concrete will have to be poured on site, since there will need to be a homogenous shear force resistance from the top of this thing all the way down to the bottom. If the sections were simply bolted together, then 200+ vertical slip-critical connections is going to give you a heck of a wobble.
Poured reinforced concrete is a composite connection, the steel acting to counter the moment effects and tension forces in concrete.
However, I have not seen all of the plans for this thing, and if they were to assemble, say, 20 storeys with formworks for shear assemblies, then poured a twenty story concrete lift on site, waited three days to achieve 75% curing strength, then kept going with 20 more storeys, this could work. It's not impossible, but there's a lot of problems that, while SOLVABLE, would never get approval in North America due to unacceptable levels of risk.