Learn More on Slab Spacing and Its Effective Depth
Facts about slab spacing and effective depth:
Slab has two types of bar present in it-
– Main Bars
– Distribution Bars (Provided against compression and temperature)
Maximum space needed between each Steel Bars:
a) 1/8 of the total thickness of the slab is the maximum diameter of the bar used in the slab.
b) Maximum spacing for the Main bars is specified to whichever is lesser-3 times Effective Depth or 300mm.
c) In the case of Distribution bars, maximum spacing is restricted to whichever is lesser-4 times Effective Depth or 450mm.
Therefore, we can assume that, Spacing, Thickness of Slab, Diameter of bar and Effective Depth are inter-related.
We can conclude from here:
Effective Depth=Depth of Slab-Clear Cover-Half of Diameter of Bar
Minimum gapping needed between Individual Bars:
For spacing of Bars, following are applicable:
a) If diameters are equal- Diameter of the Bar
b) If diameters are unequal- Diameter of the larger Bar
c) Should exceed the nominal maximum size of coarse aggregate by 5mm.
While evaluating the above parameters, Nominal Covers should be kept in mind.