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Minimum Thickness of a One-Way Slab

Easyslabminimum-thicknessspan-rule
A simply supported one-way slab has design span L = 4.0 m. Use the supplied minimum overall thickness rule h ≥ L/20 with no modifiers. What is the minimum overall thickness h?
  1. A100 mm
  2. B400 mm
  3. C250 mm
  4. D200 mm
Show solution

Answer: D. 200 mm

Equation: hmin = L/20. Inputs: L = 4.0 m = 4,000 mm. Substitution: 4,000/20 = 200 mm (total thickness, not effective depth). Wrong: 100 mm uses L/40; 400 mm uses L/10; 250 mm uses L/16. These are wrong ratios and do not match the supplied rule.
mm
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