RCC Structures Design
According to the steel beam theory of doubly reinforced beams

Compression is resisted by compression steel
Tension is resisted by tension steel
Stress in tension steel equals the stress in compression steel
All of the listed here

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RCC Structures Design
If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

[(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ
[(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ
[(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ
[(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

A transverse plane section remains a plane after bending
During deformation limits, Hook's law is equally applicable to concrete as well as to steel
All listed here
Variation of stress in reinforcement due to changes in external loading is negligible

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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

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

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