The critical section for punching shear in a flat slab (per IS 456) is at a distance of:
Choose the correct answer
d from column face
d/2 from the column periphery (forming a critical perimeter at d/2)
2d from column face
At column face only
Correct Answer
B. d/2 from the column periphery (forming a critical perimeter at d/2)
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IS 456 Cl. 31.6: Critical section for punching shear in flat slab is at d/2 from the periphery of the column/capital (where d = effective depth). The shear perimeter is at distance d/2 all around. Check: τv = V/(b0 × d) ≤ τc (permissible punching shear). Drop panels increase d at support.
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