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

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

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Design of Steel Structure
The bracing between two columns of a steel tank will be designed to resist

horizontal shear due to wind or earthquake only
horizontal, shear due to wind or earthquake + 2.5% of column loads
column loads + full horizontal shear due to wind or earthquake
column loads + 2.5% of horizontal shear due to wind or earthquake

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