E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional [3D] extent, e.g. lattice girders
E04C5/065—Light-weight girders, e.g. with precast parts
Structures en béton armé et en acier, notamment pour réaliser des poutres et, en particulier, des poutres à usage de pannes ou des poutres à grande portée