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The maximum bending moment for design of channel/I-section purlin is calculated by

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The maximum bending moment for design of channel/I-section purlin is calculated by

(a) Wl/10, where W= concentrated load

(b) Wl/8, where W= concentrated load

(c) W/10, where W= concentrated load

(d) W/8, where W= concentrated load

I got this question in unit test.

This interesting question is from Purlins topic in chapter Design of Beams of Design of Steel Structures

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Correct choice is (a) Wl/10, where W= concentrated load

The best explanation: The gravity load, P1 and load due to wind component, H1 are computed. The loads are multiplied by load factors. Thus, P = γfP1, H = γfH1 . The maximum bending moment are calculated as Mz = Pl/10 and My = Hl/10, where P= factored load along z-axis, H = factored load along y-axis, l= span of purlin (c/c distance between adjacent trusses).

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