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RCC Structures Design

RCC Structures Design
If the permissible compressive stress for a concrete in bending is C kg/m², the modular ratio is

2800/3C
2300/2C
2800/C
2800/C²

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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

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

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

Five times
Three times
Six times
Four times

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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

5
1
2
3

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RCC Structures Design
Spacing of stirrups in a rectangular beam, is

Increased at the ends
Increased at the centre of the beam
Decreased towards the centre of the beam
Kept constant throughout the length

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RCC Structures Design
The width of the flange of a T-beam, which may be considered to act effectively with the rib depends upon

Centre to centre distance between T-beams
Breadth of the rib
Overall thickness of the rib
All of the listed here

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