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RCC Structures Design

RCC Structures Design
If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is

40
45
50
55

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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)

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RCC Structures Design
The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm² and B.M. 24 mt,

Is over safe in shear
Is unsafe in shear
Is safe in shear
Needs redesigning

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RCC Structures Design
After pre-stressing process is completed, a loss of stress is due to

Shrinkage of concrete
All of the listed here
Creep of concrete
Elastic shortening of concrete

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

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RCC Structures Design
The horizontal portion of a step in a stairs case, is known as

Flight
Tread
Rise
Winder

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