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RCC Structures Design

RCC Structures Design
The floor slab of a building is supported on reinforced cement floor beams. The ratio of the end and intermediate spans is kept

0.7
0.2
0.9
0.8

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

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

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

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RCC Structures Design
A raft foundation is provided if its area exceeds the plan area of the building by

40 %
10 %
50 %
20 %

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RCC Structures Design
If jd is the lever arm and ΣO is the total perimeter of reinforcement of an R.C.C. beam, the bond stress at the section having Q shear force, is

Q/3jdƩO
Q/jdƩO
Q/2jdƩO
2 × Q/jdƩO

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RCC Structures Design
Dimensions of a beam need be changed if the shear stress is more than

20 kg/cm²
10 kg/cm²
15 kg/cm²
25 kg/cm²

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