While erecting channel section purlins, it is desirable that they are erected over rafter with their flange(a) facing down slope(b) facing up slope(c) does not depend whether up slope or down slope(d) flanges are placed randomlyThe question was asked in an online interview.I want to ask this question from Purlins topic in portion Design of Beams of Design of Steel Structures

While erecting channel section purlins, it is desirable that they are

1.	While erecting channel section purlins, it is desirable that they are erected over rafter with their flange(a) facing down slope(b) facing up slope(c) does not depend whether up slope or down slope(d) flanges are placed randomlyThe question was asked in an online interview.I want to ask this question from Purlins topic in portion Design of Beams of Design of Steel Structures
Answer» Correct answer is (b) FACING up slope To explain I WOULD say: While erecting angle, CHANNEL or I- section purlins, it is desirable that they are erected over rafter with their flange facing up slope. In this POSITION, the TWISTING moment does not cause any instability. The twisting moment will cause instability if the purlins are kept in such a way that the flanges face the downward slope.

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