Where do we use singly and doubly reinforced beam in construction purposes

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Where do we use singly and doubly reinforced beam in construction purposes..

when moment of resistance is more in tension zone (bottom of beam) than extra reinforcement to be provide in compression zone ( top of beam). threre should be provide doubly rc beam otherwise singly rc beam .

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Where do we use singly and doubly reinforced beam in construction purposes..

Answer / menaka

When there's chance for reversal of stresses we go for doubly reinforced sections to increase moment of resistance

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