RCC Structures Design
The width of the flange of a L-beam, should be less than

Breadth of the rib + four times thickness of the slab
One-sixth of the effective span
Least of the above
Breadth of the rib + half clear distance between ribs

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RCC Structures Design
A pre-stressed concrete member is preferred because

Large size of long beams carrying large shear force need not be adopted
Removal of cracks in the members due to shrinkage
All listed here
Its dimensions are not decided from the diagonal tensile stress

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

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