In IS 800 (LSM), the design compressive strength of a column (Pd) is determined from:
Choose the correct answer
Pd = Ag × fy always
Pd = Ae × fcd where fcd is from IS 800 buckling curves based on slenderness
Pd = 0.5 Ag × fy
From Euler buckling load directly
Correct Answer
B. Pd = Ae × fcd where fcd is from IS 800 buckling curves based on slenderness
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IS 800 Cl. 7.1.2: Pd = Ae × fcd where Ae = effective area, fcd = design compressive stress from buckling curve equations. fcd depends on non-dimensional slenderness ratio λ = √(fy/fcc) where fcc = π²E/(KL/r)². IS 800 provides 5 buckling curves (a, b, c, d, e) depending on section type and buckling axis.
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