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The slenderness ratio of each member when placed back-to-back or separated by small distance shall be

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The slenderness ratio of each member when placed back-to-back or separated by small distance shall be

(a) greater than 40

(b) not greater than 40

(c) 0.8 times the slenderness ratio of column as a whole

(d) greater than 50

This question was posed to me by my school teacher while I was bunking the class.

My query is from Back-to-Back Connection topic in portion Design of Compression Members of Design of Steel Structures

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The correct answer is (b) not greater than 40

The explanation: Two rolled sections placed back-to-back or separated by small distance should be connected together by rivets/bolts/welds so that slenderness ratio of each member when placed back-to-back or separated by small distance is not greater than 40 or 0.6 times the slenderness ratio of column as a whole.

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