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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

0.9
0.8
0.7
0.2

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RCC Structures Design
The Young's modulus of elasticity of steel, is

275 KN/mm²
250 KN/mm²
150 KN/mm²
200 KN/mm²

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RCC Structures Design
In a pre-stressed beam carrying an external load W with a bent tendon is having angle of inclination ? and pre-stressed load P. The net downward load at the centre is

W - 2P cos θ
W - P sin θ
W - 2P sin θ
W - P cos θ

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RCC Structures Design
The system in which high tensile alloy steel bars (silica manganese steel) are used as pre-stressing tendons, is known as

Lee-McCall system
Freyssinet system
C.L. standard system
Magnel-Blaton system

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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
After pre-stressing process is completed, a loss of stress is due to

Elastic shortening of concrete
All of the listed here
Creep of concrete
Shrinkage of concrete

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