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

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

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RCC Structures Design
If the shear stress in a R.C.C. beam is

Equal or less than 5 kg/cm², no shear reinforcement is provided
Greater than 20 kg/cm², the size of the section is changed
Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
All of these

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RCC Structures Design
In a singly reinforced beam

Compression is borne entirely by concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending
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

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