Open web Z-shaped structural metal beam

摘要

An open web metal structural beam for use in building construction has a generally Z-shaped transverse cross section and is capable of being nested and joined in a lapped position with like beam members. The beam has a top chord defined by an elongate longitudinal angle having an L-shaped transverse cross section, a bottom chord member defined by an elongate longitudinal angle having an L-shaped transverse cross section. The top and bottom chords are secured by an open web member in vertically opposed relation with the vertical leg portions of the L-shapes aligned vertically and horizontal leg portions of the L-shapes in laterally opposed relation and the laterally opposed longitudinal edges of the horizontal leg portions of the L-shapes are bent to form vertically opposed longitudinally extending stiffener lips on the chord members. One or more metal angle members welded vertically between the vertical legs of L-shaped chord members on the side opposite the web increase the rigidity of the structural beam. The open web is formed of one or more metal bars secured at longitudinally spaced intervals between the vertical leg portions of the L-shaped top and bottom chord members in a longitudinally extending diagonal configuration extending between the top and bottom chords. The Z-shaped beams may be nested for shipping and joined together to span greater distances than the single beams alone.