A box girder or tubular girder (or box beam) is a girder that forms an enclosed tube with multiple walls, as opposed to an I-beam or H-beam. Originally constructed of wrought iron joined by riveting, they are now made of rolled or welded steel, aluminium extrusions or prestressed concrete.
A box girder or tubular girder (or box beam) is a girder that forms an enclosed tube with multiple walls, as opposed to an I-beam or H-beam. Originally constructed of wrought iron joined by riveting, they are now made of rolled or welded steel, aluminium extrusions or prestressed concrete.
Source: Wikipedia "Box girder" · CC BY-SA 4.0
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