## RCC Structures Design In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

(t + c)/n = (d + n)/n
mc/t = (d - n)/t
(m + c)/t = n/(d + n)
mc/t = n/(d - n)

## RCC Structures Design The width of the flange of a L-beam, should be less than

Breadth of the rib + half clear distance between ribs
Least of the above
Breadth of the rib + four times thickness of the slab
One-sixth of the effective span

## RCC Structures Design If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/12 (L - D/3)²
WL/10 (L - 2D/3)²
WL/12 (L - 2D/3)²
WL/10 (L + 2D/3)²

236 cm
233 cm
300 cm
176 cm

## RCC Structures Design The minimum clear cover for R.C.C. columns shall be

Smaller of 40 mm or diameter
Greater of 40 mm or diameter
Greater of 25 mm or diameter
Smaller of 25 mm or diameter

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