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Important Notes On Slab (Spacing, Effective Depth Etc)

Important Notes On Slab:

There are two types of bars present in the slab.

⇒ Main bars.


⇒ Distribution bars (bars provided against shrinkage and temperature).

Maximum spacing Between Individual Bars:

1) The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab.

2) For main bars, maximum spacing is restricted to 3 times effective depth or 300 mm whichever is smaller.

3) For distribution bars, the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is smaller.

Hence, diameter of bar, thickness of slab, effective depth and spacing are co-related.

Effective depth = depth of slab – clear cover- half of diameter of bar

Minimum Distance Between Individual Bars:

Minimum Distance Between Individual Bars  & main reinforcing bars shall usually be not less than the greatest of the following:

The following shall apply for spacing of bars:

1) The diameter of the bar if the diameters are equal,

2) The diameter of the larger bar if the diameters are unequal and

3) 5 mm more than the nominal maximum size of coarse aggregate.

Clear cover (Nominal Cover) shall be kept in mind while calculating the above parameters.

Source: IS-456 (2000)



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Comments ( 3 )

  1. Thanks a lot for this wonderful article, its a great help for civil engineering students who are looking for some innovative changes and thanks a lot for these type of information because it gives great insights to some challenging and innovative work. going to bookmark this site.

  2. Effective depth = depth of slab – clear cover- half of diameter of bar sir Esme clear cover 2times hoga ya fr 1times that’s my dought

  3. Md Forhad Hossain
    March 3, 2019 at 5:26 am

    I’m working in a germents factory as a site engineer ( Diploma). I think i have ability to continue residential buildin. You can contact with me if you would like furthe.

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