RCC Structures Design
If p₁ and p₂ are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

(p₁ - p₂) ⅔h
[(p₁ - p₂)/2] h
[(p₁ + p₂)/4] h
[(p₁ + p₂)/2] h

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

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RCC Structures Design
Steel beam theory is used for

Beams if shear exceeds 4 times allowable shear stress
Steel beams encased in concrete
Design of simple steel beams
Doubly reinforced beams ignoring compressive stress in concrete

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