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

By Mona Kumari|Updated : June 24th, 2022

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

  1. 35
  2. 25
  3. 30
  4. 20

Answer: 3. 30

The maximum ratio of span to depth of a slab simply supported and spanning in one direction, is 30.

Solution :

The span to total depth ratios listed below may be assumed to satisfy vertical deflection restrictions for loading classes up to 3 kN/m2 for two way slabs of shorter span (up to 3.5 m) with mild steel reinforcing.

Type of beam

Span/depth ratio for mild steel

Span/depth ratio for HYSD bars

Simply supported 

35

28

Continuous slab

40

32

A slab simply supported and spanning in two directions can have the maximum ratio of span-to-depth as 35.

NOTE: 

When calculating the span to effective depth ratio for slabs that span in two directions, the shorter of the two spans should be used.

The value given in the mild steel column should be multiplied by 0.8 for high-strength deformed bars of grade Fe 415.

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