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RCC Structures Design

RCC Structures Design
As per IS : 1343, total shrinkage for a pre-tensioned beam, is

3.0 × 10⁻³
3.5 × 10⁻⁵
3.0 × 10⁻⁵
3.0 × 10⁻²

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

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

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RCC Structures Design
A raft foundation is provided if its area exceeds the plan area of the building by

10 %
20 %
40 %
50 %

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RCC Structures Design
The load stress of a section can be reduced by

Increasing the total perimeter of bars
Replacing smaller bars by greater number of greater bars
Replacing larger bars by greater number of small bars
Decreasing the lever arm

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RCC Structures Design
The effective span of a simply supported slab, is

Clear distance between the inner faces of the walls plus twice the thickness of the wall
Clear span plus effective depth of the slab
Distance between the centers of the bearings
None of these

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