Design of Steel Structure
Generally the purlins are placed at the panel points so as to avoid

Axial force in rafter
Shear force in rafter
Bending moment in rafter
Deflection of rafter

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Design of Steel Structure
The sway bracing is designed to transfer

10% of the top panel wind load to bottom bracing
50% of the top panel wind load to bottom bracing
25% of the top panel wind load to bottom bracing
2Vi % of the top panel wind load to bottom bracing

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