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Built Up Columns - Lacing

A steel colum...

Question

A steel column in a multi-storeyed building carries an axial load of 200 N. It is built up of 2 ISMC 350 channels connected by lacing. The effective length and thickness of lacing flat is 420 mm and 12 mm respectively. The slenderness ratio of lacing flat is ______.
121.24

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Solution

The correct option is A 121.24
$λ = \frac{l_{e f f}}{r} = \frac{l_{e f f}}{\frac{t}{\sqrt{12}}} = \frac{420}{\frac{12}{\sqrt{12}}} = 121.24$

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