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RCC Structures Design

RCC Structures Design
The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is

30
20
35
25

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RCC Structures Design
A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm² steel. If the modular ratio (m) is 15, the depth of the neutral axis, is

20 cm
30 cm
35 cm
25 cm

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RCC Structures Design
If l₁ and l₂ are the lengths of long and short spans of a two way slab simply supported on four edges and carrying a load w per unit area, the ratio of the loads split into w₁ and w₂ acting on strips parallel to l₂ and l₁ is

w₁/w₂ = (l₂/l₁)³
w₁/w₂ = (l₂/l₁)⁴
w₁/w₂ = l₂/l₁
w₁/w₂ = (l₂/l₁)²

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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

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

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RCC Structures Design
In the zone of R.C.C. beam where shear stress is less than 5 kg/cm², nominal reinforcement is provided at a pitch of

One-half lever arm of the section
One-third lever arm of the section
Lever arm of the section
One and half lever arm of the section

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RCC Structures Design
Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as

1/10th of the span
1/8th of the span
1/16th of the span
1/12th of the span

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