RCC Structures Design
After pre-stressing process is completed, a loss of stress is due to

Creep of concrete
All of the listed here
Shrinkage of concrete
Elastic shortening of concrete

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

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

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