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

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

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Design of Steel Structure
The mechanism method and the statical method give

upper bound on the strength of structure
upper and lower bounds respectively on the strength of structure
lower bound on the strength of structure
lower and upper bounds respectively on the strength of structure

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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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