RCC Structures Design
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/10 (L - 2D/3)²
WL/12 (L - D/3)²
WL/12 (L - 2D/3)²
WL/10 (L + 2D/3)²

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RCC Structures Design
If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]
h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²
h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²
h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Half of the width of the slab
Two-third of the width of the slab
Three-fourth of the width of the slab
Four-fifth of the width of the slab

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