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High Rise Structure Material

High Rise Structure Material

High Rise Structure Material

(OP)
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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