RCC Structures Design
The amount of reinforcement for main bars in a slab, is based upon

Minimum bending moment
Minimum shear force
Maximum bending moment
Maximum shear force

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RCC Structures Design
For a ribbed slab

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

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