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RCC Structures Design

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

Rise
Tread
Flight
Winder

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

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RCC Structures Design
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or

12 bar diameters
30 bar diameters
24 bar diameters
18 bar diameters

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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

52.5
51.5
54.5
53.5

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RCC Structures Design
The width of the rib of a T-beam, is generally kept between

1/2 to 3/4 of rib depth
1/3 to 1/2 of rib depth
1/3 to 2/3 of rib depth
1/7 to 1/3 of rib depth

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

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

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