RCC Structures Design
The diameter of the column head support a flat slab, is generally kept

0.25 times the span length
4.0 cm larger than the diameter of the column
0.25 times the diameter of the column
5.0 cm larger than the diameter of the column

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RCC Structures Design
If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²
h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]
h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²
h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]

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

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