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

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

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

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

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