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

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

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Design of Steel Structure
The elastic strain for steel is about

1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain
1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain
1/12 of strain at the initiation of strain hardening and 1/200 of maximum strain
1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain

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