2. Reinforced concrete beam: occupies a large seat in modern architecture, generally including rectangular beam, T-beam, thin web beam and roof truss; Rectangular beams and T-beams are suitable for cast-in-place reinforced concrete structures, thin web beams and roof trusses are prefabricated on site or prefabricated by prefabricated manufacturers and mechanically hoisted; Reinforced concrete beams can be divided into prestressed and non-prestressed.
3. Steel frame beam: Steel frame structure is common in factory buildings and long-span building structures, and it is a roof truss structure assembled by welded and bolted steel bars.