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

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

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

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

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