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RCC Structures Design

RCC Structures Design
An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at

25°
35°
45°
55°

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

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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

20 mm
15 mm
25 mm
10 mm

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RCC Structures Design
The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

Shear force/(Lever arm × Width)
Width/(Lever arm × Shear force)
Lever arm/(Shear force × Width)
(Shear force × Width)/Lever arm

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RCC Structures Design
If W is total load per unit area on a panel, D is the diameter of the column head, L is the span in two directions, then the sum of the maximum positive bending moment and average of the negative bending moment for the design of the span of a square flat slab, should not be less than

WL/10 (L + 2D/3)²
WL/12 (L - 2D/3)²
WL/12 (L - D/3)²
WL/10 (L - 2D/3)²

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RCC Structures Design
An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is

Is safe with stirrups and inclined members
Is safe with stirrups
Safe in shear
Needs revision of the section

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