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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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Similar questions

Q. In the design of lacing system for a built-up steel column, the maximum allowable slenderness ratio of a lacing bar is ______.

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Q. Four angles of ISA 90 x 90 x 10 mm are used for a built up column as shown in the fig. The column is subjected to a compressive force of 1200 kN. If a flat of 80 x 10 mm size is used as lacing bar for the single lacing system and inclination of the lacing bar is 45

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4. For a single lacing system, the thickness of flat should not be less than 1/40th its effective length.

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