RCC Structures Design
In a pre-stressed member it is advisable to use

Low strength concrete only
High strength concrete only
High strength concrete and high tensile steel
Low strength concrete but high tensile steel

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RCC Structures Design
In a singly reinforced beam

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

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