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

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

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

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

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