Steel uses I shape that bear more shear load, that is why it is typically used for high buildings, while concrete is used for small building due to the low shear force it can bear.
RCC will need more area as the number of floors get higher, the steel structure don't.
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Rcc beam is supported between two support to carry the structure
It is rcc structure which carries the load of super structure to the soil.
About 2.27 kg of steel bars is used for the RCC slab of size 50' 18' 4.5.
Concrete is very strong in compression but weak in tension. RCC is concrete with reinforcing steel bars in it. Steel is a really good material in tension. Steel carries the tensile load and thus RCC is strong in tension too. However, designers still try to ensure concrete is in compression wherever possible.
Steel Cannot be calculated based on cft. Load bearing capacity is required to calculate steel.