A box or tubular girder is a girder that forms an enclosed tube with multiple walls, rather than an I or H-beam. Originally constructed of riveted wrought iron, they are now found in rolled or welded steel, aluminium extrusions or prestressed concrete.
近义、反义、联想词
近义词
n.
beam
英英词典
box girder n.
a beam built up from boards; has a hollow rectangular cross section