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If purlins are assumed to be simply supported, the moments will be(a) wl^2/10(b) wl/8(c) wl/10(d) wl^2/8This question was posed to me in homework.This intriguing question comes from Purlins topic in division Design of Beams of Design of Steel Structures

Answer»

The correct answer is (d) wl^2/8

Easy explanation: Purlins can be DESIGNED simple, continuous or cantilever BEAMS. If purlins are assumed to be SIMPLY supported, the moments will be wl^2/8. If they are assumed to be continuous, the moments will be slightly less and taken as wl2/10. IS 800 recommends the purlins to be designed as continuous beams.



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