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Guy Barnes
Asked a question last year

Which is best material for G+12 building, RCC or Composite of RCC & Steel?

Which is effective in terms of costing for G+12 building - RCC or Composite (RCC+Steel)?

Where am I?

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Short answer : Composite. Composite structures are generally preferred for buildings with at least ten floors when looked upon from a cost point of view. But just generalizing this would be too vague. A lot should depend on the particular project at hand. Though, composite wins hands down in terms of project completion time.

Long answer : You can do a short analysis yourself. Since a slight difference in cost can also be an important factor, one can do some calculations by first modeling the building in ETABS or SAP. Then, you can calculate the quantity of materials needed for both approaches. You can multiply by the rates to get your material cost. Usually, composite beams and slabs are cut cheaper than RCC, and the columns are at par in both the methods. Then, you can use project time calculation software and henceforth deduce labor, machinery, electricity costs, etc. Also, composite buildings save both time and material on foundations. You can add up to find out simple total costs. If the difference is huge, you need not care about miscellaneous costs generalizing them to come within the difference, and you have your cheaper method.

I once read that for a simple B+G+20 tower, the composite method must take only 45% the time and around 80% of the materials as compared to the RCC method. The paper had carried out an exhaustive cost analysis, as mentioned above.

Timmothy Ferguson
Assistant Project Manager

Hi, To solve this query first you must have to know what is a composite structure and RCC structure.

Composite structure building exists when the two different materials are bound together by any means in a very strong manner so that they can act as a single component give a structural point of view.

Reinforced cement concrete buildings is a composite material but having low tensile strength and ductility which are encountered by the inclusion of reinforcement having higher tensile strength and ductility. Indian forced cement concrete structures reinforcement abound with cement concrete and both the members are really strong and compression and tension.

So if I concluded for G+ 12 types of painting reinforced cement concrete structures is used because it has very high tensile and ductility property and gives a high resistance against competition and tension also.

Hope you get the concept.