their height is higher than or equal than 80 mm;

the surface of the webs is connected by radius with the internal faces of the flanges;

the external faces of the flanges are parallel;

the edge of the flanges is sharp-angled on the external side and, either sharp, or rounded on the internal side;

the flanges themselves are, either of decreasing thickness (of the web) towards the edge, or of constant thickness and, in the second case, the corresponding section is known as with parallel flanges.

I or U with unequal or dissymmetrical flanges;

sections for supporting.

I-section ( le petit profil I), standard section whose cross section is I- or H-shaped; the height, lower than 80 mm, is at least equal to 40 mm;

channel bar or U-section ( le petit profil U), standard section with a U-shaped cross section. The height, lower than 80 mm, is at least equal to 30 mm;

Zor s section ( le profil ...