Grosimea web - Grosimea secțiunii centrale verticale care conectează cele două flanșe - variază în funcție de înălțimea pentru oțelul canalului S355JR, cu variații tipice de la 3,0 mm (U50) la 14,0 mm (U400). Exemple includ:
Canale mici: U50x37x4.5 (grosime web de 4,5 mm), U70x45x5 (grosime web de 5,0 mm)
Canale medii: U120x53x5.5 (grosime web de 5,5 mm), U200x73x7 (7,0 mm grosime web)
Large channels: U300x90x10 (10.0 mm web thickness), U400x140x14 (14.0 mm web thickness)The web's primary role is to resist shear forces- lateral forces acting parallel to the channel's cross-section (e.g., wind loads, seismic activity). Thicker webs provide higher shear capacity, making them suitable for short-span channels supporting heavy loads. Thinner webs are used in long-span applications where bending (not shear) is the primary load, as they reduce weight without compromising bending strength. EN 10025-2:2004 specifies web thickness tolerances: ±0.4 mm for thicknesses ≤5 mm, ±0.5 mm for 5.1–10 mm, and ±0.6 mm for >10 mm. Aceste toleranțe asigură că Web -ul poate transfera în mod fiabil forțele de forfecare între flanșe, prevenind eșecul prematur.