The 'punching shear' critical perimeter for a column in a flat slab IS 456:
Choose the correct answer
At the column face itself
At d/2 from column face on all sides — b0 = 4(a+d) for square column of side a
At L/4 from column
At the slab edge only
Correct Answer
B. At d/2 from column face on all sides — b0 = 4(a+d) for square column of side a
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IS 456 Cl. 31.6: punching shear critical perimeter at d/2 from column face (d = effective depth). For square column a×a: perimeter b0 = 4(a+d). Shear stress τv = Vu/(b0×d). Allowable: τc_max = 0.25√fck (IS 456). If τv > allowable: provide shear studs, drop panel, or increase d. Different from one-way shear critical at d from face.
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