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Which of the following is true about tubular section?

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Which of the following is true about tubular section?

(a) tubes have low buckling strength

(b) tubes have same radius of gyration in all direction

(c) tubes do not have torsional resistance

(d) weight of tubular section is more than the weight required for open profile sections

I had been asked this question in my homework.

This intriguing question originated from Behaviour of Compression Members & Types of Sections topic in division Design of Compression Members of Design of Steel Structures

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Right answer is (b) tubes have same radius of gyration in all direction

The best explanation: Tubes have same radius of gyration in all direction. They have high buckling strength and have excellent torsional resistance. Weight of tubular section is less than one half the weight required for open profile sections.

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