'Purlins' in a roof truss system are designed as:
Choose the correct answer
Compression members (columns)
Biaxial bending members — gravity load resolved along roof slope and normal to it, plus wind in/out of plane
Tension-only rods
Only for resisting horizontal wind load
Correct Answer
B. Biaxial bending members — gravity load resolved along roof slope and normal to it, plus wind in/out of plane
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Purlins: secondary members spanning between roof trusses, carrying roof sheets/cladding. Subjected to biaxial bending because: (1) Major axis bending from vertical (gravity) loads resolved along and perpendicular to slope; (2) Wind suction/pressure. IS 800: Z-section or C-section purlins common. Designed as beam in biaxial bending; can use IS 800 method for bending about both axes.
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