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

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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