7220.127.116.11.3 Slabs With Ribbed Soffits
The thickness of slabs with ribbed or undulating soffits (see Figure 718.104.22.168.3) shall be determined by one of the following expressions, whichever is applicable:
For s > 4t, the thickness to be used shall be t
For s ≤ 2t, the thickness to be used shall be te
For 4t > s > 2t, the thickness to be used shall be
s = Spacing of ribs or undulations.
t = Minimum thickness.
te = Equivalent thickness of the slab calculated as the net area of the slab divided by the width, in which the maximum thickness used in the calculation shall not exceed 2t.