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RCC Structures Design

RCC Structures Design
According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

15 kg/cm²
5 kg/cm²
20 kg/cm²
10 kg/cm²

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RCC Structures Design
If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width

√(R² + T²)
T - R
R + T
R - T

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RCC Structures Design
The minimum cube strength of concrete used for a pre-stressed member, is

350 kg/cm²
150 kg/cm²
50 kg/cm²
250 kg/cm²

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

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RCC Structures Design
Distribution reinforcement in a simply supported slab, is provided to distribute

Load
Shrinkage stress
Temperature stress
All listed here

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RCC Structures Design
Lapped splices in tensile reinforcement are generally not used for bars of size larger than

18 mm diameter
24 mm diameter
30 mm diameter
36 mm diameter

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