Question
Download Solution PDFGenerally, the purlins are placed at the panel points so as to avoid
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Purlins:
- Beams that carry the roof loads in trusses are called purlins. These are placed in a tilted position over the principal rafters of the trusses.
- Purlins may be designed as simple, continuous or cantilever beams. the simple beam design yields the greatest moments and deflections.
- Purlins have a tendency to sag in the direction of sloping roof and sag rods are sometimes provided midway or at third points, between roof trusses, to take up the sag. these rods reduce the moment and result in a smaller purlin section. So generally purlins are placed at the panel points so as to avoid bending moment in rafters.
Additional Information
- If purlins are assumed to be simply supported the moment will be \(wl^2 \over 8\).
- If purlins are assumed to be continuous the moment will be \(wl^2 \over 10\).
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