RCC Structures Design
An R.C.C. roof slab is designed as a two way slab if

The slab is continuous over two supports
It supports live loads in both directions
The slab is discontinuous at edges
The ratio of spans in two directions is less than 2

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RCC Structures Design
In a singly reinforced beam

Compression is borne entirely by concrete
Steel possesses initial stresses when embedded in 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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