high rise structure material
 

high rise structure material
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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here are some pros and cons according to industry organisations of the two protagonists: