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Punching Shear Perimeter at a Column

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An interior square column is 400 mm on each side. The slab effective depth is d = 200 mm, with no nearby edges or openings. The critical punching perimeter is a square located d/2 outward from every column face. What is the perimeter b₀?
  1. A1,600 mm
  2. B2,400 mm
  3. C3,200 mm
  4. D2,000 mm
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Answer: B. 2,400 mm

Equation: each side of the critical square = c + 2(d/2) = c + d, and b₀ = 4(c + d). Substitution: side = 400 + 200 = 600 mm; b₀ = 4(600) = 2,400 mm. Wrong: 1,600 mm is 4c, the column-face perimeter; 3,200 mm is 4(c + 2d), which puts the section d from each face; 2,000 mm is 4(c + d/2), offsetting only one side of each edge.
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