RCC Structures Design
Steel beam theory is used for

Steel beams encased in concrete
Design of simple steel beams
Beams if shear exceeds 4 times allowable shear stress
Doubly reinforced beams ignoring compressive stress in concrete

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RCC Structures Design
For a ribbed slab

Width of the rib shall not be less than 7.5 cm
All listed here
Overall depth of the slab shall not exceed four times the breadth of the rib
Clear spacing between ribs shall not be greater than 4.5 cm

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