RCC Structures Design
If the depth of actual neutral axis of a doubly reinforced beam

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Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier

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RCC Structures Design
A pre-stressed concrete member is preferred because

Removal of cracks in the members due to shrinkage
Its dimensions are not decided from the diagonal tensile stress
Large size of long beams carrying large shear force need not be adopted
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