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EMPIRICAL RELATIONS FOR THICKNESSES.

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Hi there!

PROBLEM:

 - Empirical relations for establishing preliminary
   thicknesses of:

           - walls

           - bottom/floor slab


  in the design of water retaining structures,
  sanitary structures, swimming pools, etc is
  required.

AVAILABLE REFERENCES:

 - ACI 350  is silent on the subject, except it
   suggests a minimum wall thickness of 300 mm
   (12-in) should be used for depths 3 m
   (9.84 ft) & above. The reasons forwarded are
   related to detailing problem due to rebars on
   both the faces including concrete cover.

 - for slabs, it is silent completely.

 - B.S (British code of practice) in a reference
   DESIGN OF LIQUID RETAINING CONCRETE STRUCTURE
   bY: R.D. Anchor, stipulates:

       -  wall thickness = depth/10

       - for slabs, however, it is silent.

 - In yet another reference HANDBOOK OF CONCRETE
   ENGINEERING by: Mark Fintel, the following is
   suggested:

       - wall thickness = depth/16

       - slab thickness = span/16

 - In case of wall thickness it looks to be on
   a lower side as compared to B.S
   recommendations for the same.

 - But this recommendation in the above
   reference is not supported by any related
   documents of ACI.

CONCLUSION:

 - based on others experiences on the subject
   the following is solicited:

       - the usual empirical relations
         practised by others.

       - citation of any related references on
         the subject.

Thanx in advance. Regards,

SYED FAIZ AHMAD; MENGG, MASCE
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA.


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