The effective span of a simply supported slab is

Answer: D. Centre to centre distance between supports

The effective span of a simply supported slab is taken as the centre to centre distance between supports.

Solution 

For simply supported beams and slabs (L_eff)

L_eff = minimum of { L_o+w and L_o+d }

where

L_o = clear span

d = effective depth 

w = Support width

The effective span of a simply supported slab is equal to the effective depth or width of the slab plus the clear span between supports (i.e., the length up to the face of the support).

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