RCC Structures Design
Post tensioning system

Was widely used in earlier days
None of these
Is economical for large spans and is adopted now a days
Is not economical and hence not generally used

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

Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
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
All listed here

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