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RCC Structures Design

RCC Structures Design
If the average bending stress is 6 kg/cm² for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

38 d
48 d
58 d
28 d

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RCC Structures Design
Post tensioning system

Is economical for large spans and is adopted now a days
Was widely used in earlier days
None of these
Is not economical and hence not generally used

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RCC Structures Design
A pile of length ‘L’ carrying a uniformly distributed load ‘W’ per metre length is suspended at the centre and from other two points 0.15 L from either end ; the maximum hogging moment will be

WL²/90
WL²/30
WL²/60
WL²/15

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RCC Structures Design
If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

[(m + r)/m] d
[m/(m - r)] d
[(r - m)/m] d
[m/(m + r)] d

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RCC Structures Design
If the width of the foundation for two equal columns is restricted, the shape of the footing generally adopted, is

Square
Rectangular
Triangular
Trapezoidal

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RCC Structures Design
For initial estimate for a beam design, the width is assumed

1/20th of span
1/30th of span
1/25th of span
1/15th of span

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