For a long column (slender column) in IS 456, the additional moment due to slenderness is:
Choose the correct answer
No additional moment for slender columns in IS 456
Ma = Pu × e_add where e_add = le²/(2000×D) — additional moment from P-delta effect
Double the primary moment always
Only EL is applied to slender columns
Correct Answer
B. Ma = Pu × e_add where e_add = le²/(2000×D) — additional moment from P-delta effect
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IS 456 Cl. 39.7: Additional moment for slender columns (lex/D > 12 or ley/b > 12): Max = Pu × ex² / (2000D) and May = Pu × ey² / (2000b) where ex = lex²/(2000D), ey = ley²/(2000b). These additional moments are added to primary eccentricity moments. Accounts for P-delta effect in slender columns.
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