Compared with traditional buildings, steel structure building is a new building structure—the entire building made of steel. The structure mainly comprises steel beams, columns, trusses, and other parts made of section steel and steel plates. It is connected between parts and parts by welding, bolts, and rivets. The lightweight and simple structures are widely used in large factories, stadiums, super high-rise buildings, and other fields.

The type of steel building structure includes the portal rigid steel frame, frame structure, truss structure, and grid structure.

• Portal frame structure: Simple force, clear force transmission path, and fast construction speed. Widely used in industrial, commercial, cultural, and entertainment public facilities.
• Steel building frame structures: Flexible, can form a larger space. Used in multi-story and high-rise buildings such as commercial office buildings, shopping malls, and conference centers.
• Steel truss structure: Uses small cross-section tubes to form larger cross-section components. Often used in large-span roofs, bridges, towers, and marine oil production platforms.
• Steel grid structure: A high-order statically indeterminate space structure. Excellent seismic resistance, lightweight, and high rigidity. Used in gymnasiums, exhibition halls, petrol stations, and hangars.