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

Its dimensions are not decided from the diagonal tensile stress
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

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RCC Structures Design
In a singly reinforced beam

Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Steel possesses initial stresses when embedded in concrete
Compression is borne entirely by concrete

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