RCC Structures Design
If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[(r - m)/m] d
[m/(m + r)] d
[(m + r)/m] d
[m/(m - r)] d

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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

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

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