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RCC Structures Design

RCC Structures Design
The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of

25 mm
20 mm
10 mm
15 mm

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

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RCC Structures Design
As the percentage of steel increases

Depth of neutral axis increases
Lever arm decreases
Lever arm increases
Depth of neutral axis decreases

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RCC Structures Design
The maximum ratio of span to depth of a slab simply supported and spanning in two directions, is

25
35
40
30

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RCC Structures Design
The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called

Economic section
All listed here
Balanced section
Critical section

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RCC Structures Design
For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is

3
1
2
5

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