A column of size 450 mm x 600 mm has unsupported length of 3.0 m and is braced against side sway in both directions. According to IS 456 : 2000, the minimum eccentrics (in mm) with respect to major and minor principle axes are:
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A.
26.0 and 21.0
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B.
20.0 and 20.0
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C.
26.0 and 20.0
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D.
21.0 and 15.0
Correct Answer:
A. 26.0 and 21.0
Explanation:
According to IS 456:2000, the minimum eccentricity (emin) for a column is calculated as the greater of (L/500) + (D/30) or 20 mm, where L is the unsupported length and D is the lateral dimension. For a 450 mm x 600 mm column with a 3000 mm length: - Major axis (600 mm): (3000/500) + (600/30) = 6 + 20 = 26 mm.
- Minor axis (450 mm): (3000/500) + (450/30) = 6 + 15 = 21 mm.
Since both calculated values (26 mm and 21 mm) exceed the 20 mm minimum limit, the minimum eccentricities are 26.0 mm and 21.0 mm.
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