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Old November 14th, 2013, 11:08 PM   #6141
droneriot
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Quote:
Originally Posted by DoubleU View Post
You can assume for high-rise buidlings that the core will usually take up 25-35% of the floor area.
In general:
Building width L,
core width L/2 => 25%

In the case of Pingan, as written before, with the assumption of a base of 70m and a core width of more than 30m (let's say 40m) the core area is 32%.
Plus, at upper floors they will reduce the wall thickness of the core (and the column size) and might cancel a few elevator shafts to get even more floor space. The core is mostly designed and occupied by the needs of MEP equipment (shafts for vertical pipes, A/C, water pumps, etc.). In addition you will have on every single floor restrooms, at least two seperate staircases, a room to collect garbage, maybe a kitchen/pantry, fire/service elevator etc. That all adds up.
Should be noted that the 70m figure for total width was given for the base, it's a bit slimmer where we are now.
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Old November 15th, 2013, 01:51 PM   #6142
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One part of the core is raised.
Nov 15.


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Old November 15th, 2013, 04:29 PM   #6143
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Now some close-up shots.






why are in the steel columns holes? get they filled with concrete??
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Old November 15th, 2013, 04:35 PM   #6144
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Old November 15th, 2013, 04:35 PM   #6145
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Yup, the megacolumns will be coated in concrete so I bet that they will be filled with concrete too
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Old November 15th, 2013, 05:15 PM   #6146
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I actually think not.
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Old November 15th, 2013, 06:45 PM   #6147
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i thinked not, too. But why are holes in the steel beems??
they get a concrete covering... but filling??

i thinked so the steel columns have hole for workers to get in and weld the from inside and outside like it was in the taipei 101. but all the little holes... maybe for flexibilaty?
but there the steel dont get covered with concrete, only filled...





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Old November 15th, 2013, 07:15 PM   #6148
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But if the columns wouldn't be filled with concrete they would present only a rather inefficient reinforcing. I heard an engineer once say that the thing that makes reinforcing so efficient is because of friction between the reinforcing steel and the concrete arround it and keeping the interior of the columns empty would, at least from what I know, severely lower the friction. Of course this is only my opinion based on my limited knowledge, so I might very well be wrong and I welcome everybody to correct me if I am wrong
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Old November 15th, 2013, 07:35 PM   #6149
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my guess is they'll be filled with concrete. also, so or so it would flow through the holes in the steel.
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Old November 15th, 2013, 10:47 PM   #6150
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my guess is they'll be filled with concrete. also, so or so it would flow through the holes in the steel.
I agree. It would make no sense to have these holes if the column was designed to be hollow.
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Old November 16th, 2013, 12:03 AM   #6151
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I agree. It would make no sense to have these holes if the column was designed to be hollow.
i agree, there are holes, the concrete will get into the column....

i dont understand why they poor the concrete not from above inside....
Get the concrete smoothly through the holes??

but i think that in nature (example for skyscrapers) most of the plants are hollow, to have more flexibility. like normal steel columns
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Old November 16th, 2013, 12:08 AM   #6152
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Of course steel columns will be filled with concrete otherwise they could crush or buckle under their own weight. This is standard practice in construction of very high buildings. Also therefore columns have such strange shape to increase cross section's moment of inertia.
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Old November 16th, 2013, 07:05 AM   #6153
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Old November 16th, 2013, 01:07 PM   #6154
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Quote:
Originally Posted by Marioma View Post
i thinked not, too. But why are holes in the steel beems??
they get a concrete covering... but filling??

i thinked so the steel columns have hole for workers to get in and weld the from inside and outside like it was in the taipei 101. but all the little holes... maybe for flexibilaty?
but there the steel dont get covered with concrete, only filled...
Try to bend one of these filled with sugar. Then have a coffee and try again with the empty paper. Of course will the megacolumns be filled with concrete!
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Old November 16th, 2013, 01:22 PM   #6155
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i understand it, but in the souzhou supertower the steel does not have little holes, only 2 big holes above to weld/bolt it from inside. and in the taipei 101 only get filled (columns)..
when u say it get coated and filled, i think its right when its normal practice

get the mega columns here only weld together? no bolting? whats about size? it think 5x2m ?
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Last edited by Marioma; November 16th, 2013 at 01:28 PM.
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Old November 16th, 2013, 03:48 PM   #6156
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Old November 16th, 2013, 04:40 PM   #6157
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6,5 m x 3,2 m

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Old November 16th, 2013, 05:03 PM   #6158
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It will soon be taller than its neighbours.
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Old November 16th, 2013, 06:09 PM   #6159
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why the holes begin at such a high point??

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Old November 16th, 2013, 06:36 PM   #6160
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Quote:
Originally Posted by Marioma View Post
6,5 m x 3,2 m

Sick, isn't it?
I have never seen anything like that in a building.

Quote:
Originally Posted by jhalsey View Post
It will soon be taller than its neighbours.
I thought it already is.
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