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High Rise Structure Material 1

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lutein

Structural
Apr 24, 2002
136
Most of our experiences are in 20 story max building design.
I was wondering, when it comes to over 40 story building, what kind of material would be suitable?

Reinforced Concrete - with PT flat slab system, it works good in long span and better clearance for mech. But when it comes to high rise, it seems to be a lot of unnecessary dead load to be carried by the columns and foundation.

Steel - Light and good for modium span length.

Question:
1. At what height does steel becomes a better material to be used? Is there a rule of thumb for this?

2. For a building with 40-50 stories, would concrete floor and concrete columns become uneffective due to heavy dead load of concrete vs steel?

I would appreciate if you could provide some advices.
 
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