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In a simply supported 9 m long beam, the effective depth should be a minimum of (approximately) d mm is required for assuming the vertical deflection to be satisfactory
1. 1286
2. 346
3. 450
4. 600
5. 360

1 Answer

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Correct Answer - Option 3 : 450

Concept:

A slab or beam is considered safe in deflection if the following provision is full filled

  • Span to effective depth ratio for a beam or one-way slab shall not be more than
    • Cantilever = 7
    • Simply supported = 20
    • Continuous = 26

Calculation:

Given

Length = 9 m 

For simply supported beam, span/d = 20

d = 9 × 103/20 = 450 mm

For two way slab:

Span /overall depth value shall not be more than 

Type of beam Fe 250 Other steel
Simply supported 35 28
continuous 40 32

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