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Purlin section is subjected to(a) not subjected to bending or twisting(b) twisting only(c) symmetrical bending(d) unsymmetrical bendingI have been asked this question in an online quiz.This interesting question is from Purlins topic in portion Design of Beams of Design of Steel Structures

Answer» RIGHT choice is (d) unsymmetrical bending

The EXPLANATION is: The wind force is assumed to act normal to roof truss and gravity LOAD pass through centre of gravity of purlin section. HENCE, the purlin section is subjected to twisting in addition to bending. Such bending is called unsymmetrical bending.


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