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

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

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RCC Structures Design
Steel beam theory is used for

Beams if shear exceeds 4 times allowable shear stress
Doubly reinforced beams ignoring compressive stress in concrete
Design of simple steel beams
Steel beams encased in concrete

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