Concrete Slab Design

Flexure Design: One-Way Slab

The procedure for designing a one-way slab in flexure is the exact procedure used to design a concrete beam. Assume a tributary width of 1' and find the necessary steel required (Asr). then find the necessary spacing of the steel by:

s = {A_b\over{A_{sr}}} (12 in)
where:

s = the spacing of the rebar
Ab = the area of an individual rebar

Maximum spacing for the main steel [1]:

smax for slabs in flexure is the smallest of:

  • 3 times the slab thickness (not depth)
  • 18"

Differences in design procedures between a slab and beam:

Although the calculations to find Asr for a beam and slab are the same, some differences between the two design procedures do exist. Those differences are:

References

  1. American Concrete Institute, "ACI 318", 2005
    • Found in section ACI 318.7.6.5

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