The 'minimum eccentricity' required in column design as per IS 456 accounts for:
Choose the correct answer
Temperature difference between column faces
Construction imperfections (load placement, column verticality) — emin = max(L/500+D/30, 20 mm)
Wind load on the column
Concrete shrinkage
Correct Answer
B. Construction imperfections (load placement, column verticality) — emin = max(L/500+D/30, 20 mm)
Why is this the answer?
IS 456 Cl. 25.4: min eccentricity emin = max(L/500 + D/30, 20 mm) in each axis. Accounts for: (1) Unavoidable construction eccentricity (load not perfectly centred); (2) Unintended imperfections in column verticality. Every column must be designed for this minimum moment Mmin = Pu × emin even if analysis gives axial load only. Short column: Pu×emin governs; slender column: additional moment from slenderness may govern.
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