Purlins on a sloping roof are subjected to:
Choose the correct answer
Only vertical load (gravity)
Biaxial bending (components parallel and perpendicular to roof slope)
Pure axial load
Torsion only
Correct Answer
B. Biaxial bending (components parallel and perpendicular to roof slope)
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Purlins span between roof trusses and support roofing sheets. The gravity load (dead + live + snow) acts vertically, which has components parallel to the roof (bending about minor axis) and perpendicular to roof (bending about major axis). Biaxial bending design is required.
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