RCC Structures Design
In a singly reinforced beam

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

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RCC Structures Design
Steel beam theory is used for

Design of simple steel beams
Doubly reinforced beams ignoring compressive stress in concrete
Beams if shear exceeds 4 times allowable shear stress
Steel beams encased in concrete

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