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

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

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Half of the width of the slab
Four-fifth of the width of the slab
Three-fourth of the width of the slab
Two-third of the width of the slab

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