A construction beam is a structural element used to support loads in construction. It is typically made of STEEL, and can be composed of a GIRDER, RIVET, H-bar, I-bar, or T-bar. A GIRDER is a large beam that supports the load of a structure, while a RIVET is a metal pin used to join two pieces of metal together. An H-bar is a type of STEEL beam with an H-shaped cross section, while an I-bar is a STEEL beam with an I-shaped cross section. Finally, a T-bar is a STEEL beam with a T-shaped cross section.