RCC Structures Design
The effective width of a column strip of a flat slab, is

Half the width of the panel
Radius of the column
One-fourth the width of the panel
Diameter of the column

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

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