RCC Structures Design
In a combined footing for two columns carrying unequal loads, the maximum hogging bending moment occurs at

More loaded column
A point of zero shear force
Less loaded column
A point of the maximum shear force

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

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RCC Structures Design
For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm
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

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