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RCC Structures Design

RCC Structures Design
The pitch of the main bars in a simply supported slab, should not exceed its effective depth by

Six times
Four times
Three times
Five times

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RCC Structures Design
The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is

51.5
54.5
52.5
53.5

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RCC Structures Design
A foundation rests on

Both B and C
Foundation soil
Base of the foundation
Sub-grade

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RCC Structures Design
According to I.S.: 456, 1978 the thickness of reinforced concrete footing on piles at its edges, is kept less than

40 cm
75 cm
30 cm
20 cm

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RCC Structures Design
A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is

45
30
35
40

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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

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

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