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Old October 28th, 2006, 12:22 AM   #1
mikering
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What is the core for?

well ive seen buildigs with core and without it so i wanna know what is its use

is only to handle lifts? on very high buildings core suports all the weight?

just wondering

cu!
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Old October 28th, 2006, 12:46 AM   #2
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It's main purpose in most buildings are the lifts, and often it does form main support of the building. Sometimes you don't see it because the floorplates are constructed at the same pace (that is, they raise the core, complete floorplate, repeat...) or a different support structure is used.

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Old October 30th, 2006, 09:08 PM   #3
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buildings with an core have more stability. especially in connection to a terrorist attack.
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Old October 30th, 2006, 10:25 PM   #4
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I doubt the existence of a core would have made much of a difference in a 9/11-style attack. If a large plane packed with fuel is going to smash into a building, the fire will melt the steel and the whole structure will collapse ... not much to do with the core anyway.
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Old October 30th, 2006, 10:34 PM   #5
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i am almost sure the WTC had a core.


brazilian highrises dont have cores.
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Old October 30th, 2006, 10:57 PM   #6
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WTC had a core for definite.

Building without a core are usually more equally weighted but this can sometimes make them less stable.
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Old October 31st, 2006, 12:23 AM   #7
mikering
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if u see pics od the wtc construction there was a core
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Old November 1st, 2006, 04:58 PM   #8
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Both the WTC towers (1 & 2) had steel cores, as you can see from this construction photo. The concrete and steel floors were assembled around the core.



The core definately made a difference in how long the WTC towers stayed standing after they were hit by the planes - technically though, the temperatures reached by the ignition of the fuel on board the planes should not have been hot enough to 'melt the steel' and make the structure collapse. Why the towers collapsed, the way they did, is a very interesting and complex issue.
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Old November 2nd, 2006, 04:16 PM   #9
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The core is used to house stairs and lifts etc - it doesn't really support vertical loads in the building any more than any other columns do but it does play an important role in resisting environmental loads - such as the wind.

Tall buildings are usually tied into the concrete core(s) to prevent them swaying (so much) in the wind. In steel frame construction (without cores) they use diagonal bracing to resist wind forces.
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Old November 5th, 2006, 10:04 AM   #10
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Here is a pic that shortly explains why the WTC collapsed.


When the plane hit inside the WTC, it destroyed some of the internal columns, with meant that there was increased pressure on the remaining columns. Statistically should the remaining columns have had strength enough to hold the building, but the extreme fire made the stell columns weak.


There is no doubt that the WTC would have had been standing for a longer time, if it had had a concrete core. Concrete is more resistant to fire, and more difficult to destroy.
Maybe it wouldn't had collapsed at all.

You can read a lot more about the collapse on www.civil.usyd.edu.au/wtc.htm
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