The U - shaped cross - section of channel steel contributes to its stability in several ways. The flanges on both sides of the U - shape provide resistance to lateral bending, preventing the steel from deforming sideways under load. The web in the middle helps to transfer vertical loads effectively. When used in structures, the shape allows for better distribution of stress, reducing the risk of local Concentration de contrainte . Cette forme permet également une connexion facile avec d'autres composants, par exemple par le soudage ou le boulon, améliorant davantage la stabilité globale de la structure .