Uses of standard section

Angle sections
Angle section may be of equal legs or unequal legs. They are used in bridges trusses and general structural steelwork.
Chanel section
These are used for columns, trusses, roof purlins, composite beams, and girders.
I-sections
They are used for columns, beams, in buildings, bridge etc.
T-section
They are widely used for steel roof trusses and to form built-up sections.
H-section
These are used for columns.
Tabular-section
These are used for columns, and trusses and pipes.