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

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

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

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RCC Structures Design
In a singly reinforced beam

Elastic moduli for concrete and steel have different values within the limits of deformation of the beam
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Compression is borne entirely by concrete
Steel possesses initial stresses when embedded in concrete

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