According to IS456-2000, a column or strut is a compression member whose effective length exceeds:

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  1. 2 times the least lateral dimension
  2. 3 times the least lateral dimension
  3. 5 times the least lateral dimension
  4. 4 times the least lateral dimension

Answer (Detailed Solution Below)

Option 2 : 3 times the least lateral dimension
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Explanation:

As per IS 456:2000, clause 25.1.1,

A column or struts is a compression member in which the effective length of column or struts exceeds three times the least lateral dimension.

i.e. Leff > (3 × Least Lateral Dimension) 

A compression member may be considered as short when both the slenderness ratio \(L_{ex}\over D\) and \(L_{ey}\over b\) are less than 12.

where

Lex = effective length with respect to the major axis

D = depth with respect to the major axis

Ley = effective length with respect to the minor axis

b = width of the member

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