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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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

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

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