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If purlins are assumed to be simply supported, the moments will be

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in Design of Steel Structures by (962k points)
If purlins are assumed to be simply supported, the moments will be

(a) wl^2/10

(b) wl/8

(c) wl/10

(d) wl^2/8

This question was posed to me in homework.

This intriguing question comes from Purlins topic in division Design of Beams of Design of Steel Structures

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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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