RCC Structures Design
The minimum thickness of a flat slab is taken

L/32 for end panels without drops
L/36 for end panels without drops
L/36 for interior panels without drop
All listed here

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RCC Structures Design
For a ribbed slab

Width of the rib shall not be less than 7.5 cm
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
All listed here

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RCC Structures Design
If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

[(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ
[(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ
[(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ
[(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ

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