Design of Steel Structure
In case of timber structures, the simple bending formula M = fz may be applied for

solid circular beams only
rectangular beams up to 300 mm depth
all square cross-section beams
all rectangular beams

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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 + 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
column loads + full horizontal shear due to wind or earthquake

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