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Old August 2nd, 2017, 02:17 PM   #561
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# Save 2 WTC and the Chicago Spire
Current Height of Jeddah Tower is 262m, 65fl
Current Height of The Tower at Dubai Creek Harbor is
~3-5m, 1fl

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Old August 2nd, 2017, 04:42 PM   #562
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Wait is this tower going to have floorplates made out of steel or floorplates made out of concrete? It looks like the lower floors are made out of concrete but now they have installed steel flooring?
It's a reinforced concrete structure.

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Old August 3rd, 2017, 12:59 AM   #563
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perhaps someone here with engineering experience can answer a question for me.

I see a building like this with huge amounts of reinforced concrete columns, etc, where the rebar occupies a significant % of the volume of the members, and all the added complication of concrete delivery, pumping, pouring, curing, etc, and I wonder, why not just use steel columns/beams?

I know reinforced concrete and steel have different compressive/tensile/etc. properties, but this looks like a job where steel could have been employed just as well.

How is the decision made? What would be the main factors using one method over the other?
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Old August 3rd, 2017, 02:24 AM   #564
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Quote:
Originally Posted by Nuwanda View Post
perhaps someone here with engineering experience can answer a question for me.

I see a building like this with huge amounts of reinforced concrete columns, etc, where the rebar occupies a significant % of the volume of the members, and all the added complication of concrete delivery, pumping, pouring, curing, etc, and I wonder, why not just use steel columns/beams?

I know reinforced concrete and steel have different compressive/tensile/etc. properties, but this looks like a job where steel could have been employed just as well.

How is the decision made? What would be the main factors using one method over the other?
Steel beams can be incredibly heavy and large which makes it very hard to transport them through dense city streets or across bridges. Also, steel needs to be protected with a lot of fireproofing foam or surrounded by concrete, which gets rid of the benefit of speed, which was the traditional reason why they used to prefer steel. Current technology allows them to remove the forms less than one week after being poured, and the forms have advanced enough to be able to reuse them constantly, instead or constantly rebuilding wood forms. Throw in the high costs of steel and the high wages of highly skilled steelworkers, and Concrete winds up being cheaper also, however the concrete plants MUST be very close by. Any more than an hour or so and both the concrete and the truck carrying it are trash. Steel can be driven around all day and night without issue.
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Old August 3rd, 2017, 03:20 AM   #565
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Thank you Towerpower123 for this excellent reply!!!
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Old August 4th, 2017, 08:20 PM   #566
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Just to clarify for Goodybear: The "floor trusses" that you see are part of the formwork for the concrete and are temporary.
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Old August 8th, 2017, 02:23 AM   #567
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Old August 10th, 2017, 08:28 AM   #568
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Vista Tower, Lakeshore East by YoChicago, on Flickr
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Old August 10th, 2017, 11:50 AM   #569
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Some constructions sites are more aesthetically pleasing then others. Tidy, organized, matching colors of construction materials, matching patterns in scaffolding.

This on is right up there
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Old August 10th, 2017, 12:02 PM   #570
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This area site was plan 66 floors then Wall Street thrown out in 1929
Very fewer information about this site only I could find:
"66 floors plan for office building but 250 metre tallest Chicago we are north"
But I try track down then find Street this site
No picture look like no information out there no mention
Only find one line mention in architecture information no know of who made
Up to until they building resident now... but four plan cancelled 55 years
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Old August 10th, 2017, 11:09 PM   #571
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Amazing building
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Old August 17th, 2017, 01:18 PM   #574
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How about the plot directly to the right of the "Vista"?
Is that not a part of the project?
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Old August 17th, 2017, 03:27 PM   #575
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Very good pictures of the building as seen from above, you are able to see the shape of the complex.
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Old August 22nd, 2017, 10:40 AM   #577
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Old August 23rd, 2017, 12:12 AM   #578
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Good answer.

Yet not all buildings in a given area are concrete, or steel for that matter, so the factors that made it necessary/attractive to build out of one material obviously aren't consistently applied, or they aren't strong requirements, which really goes to heart of my original question.

Your reasoning is all about economic/logistics issues, which is fine as far as it goes, but surely the engineering aspects are as important (perhaps more important) than those factors. Which would explain why any area has a mix of steel and concrete structures when, say, it's just as expensive to use concrete or steel in that same area.

Quote:
Originally Posted by towerpower123 View Post
Steel beams can be incredibly heavy and large which makes it very hard to transport them through dense city streets or across bridges. Also, steel needs to be protected with a lot of fireproofing foam or surrounded by concrete, which gets rid of the benefit of speed, which was the traditional reason why they used to prefer steel. Current technology allows them to remove the forms less than one week after being poured, and the forms have advanced enough to be able to reuse them constantly, instead or constantly rebuilding wood forms. Throw in the high costs of steel and the high wages of highly skilled steelworkers, and Concrete winds up being cheaper also, however the concrete plants MUST be very close by. Any more than an hour or so and both the concrete and the truck carrying it are trash. Steel can be driven around all day and night without issue.
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Old August 24th, 2017, 07:32 AM   #579
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Old August 24th, 2017, 07:34 AM   #580
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How about the plot directly to the right of the "Vista"?
Is that not a part of the project?
No, that will be a 12-story middle/high school (Gem's World Academy).
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