Temperature Steel

Temperature steel is the steel required for shrinkage and temperature stresses perpendicular to the main flexural steel. Temperature steel is only required for structural slabs, not slabs cast against the earth or retaining wall footings. The temperature steel will make one-way slabs less likely to crack from concentrated loads.

  • For Grade 40 and 50 steel : ρ = 0.0020
  • For Grade 60 steel : ρ = 0.0018
  • Above Grade 60 steel :

ρ_t = 0.0018\left(60,000\over f_y\right) > 0.0014

Temperature Steel Spacing

smax for temperture steel is the smallest of [1]:

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

#3 bars may be used, but common practice dictates to use #4 bars for ease in construction.

References

  1. American Concrete Institute, "ACI 318", 2005
    • The min slab spacing can be found in ACI 318 7.12.2.2

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