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The structure made mainly of steel is one of the main types of building structures. The steel is characterized by high strength, light weight and high rigidity, so it is especially suitable for building large-span and ultra-high and super-heavy buildings. The material is homogeneous and isotropic, and it is an ideal elastomer, which is in line with general engineering. Basic assumptions of mechanics; good plasticity and toughness, large deformation, good dynamic load; high degree of industrialization, high degree of mechanization; professional processing, high efficiency, good airtightness Therefore, it can be used to build gas tanks, oil tanks and transformers. The disadvantage is poor fire resistance and corrosion resistance. Mainly used for heavy-duty workshop load-bearing skeleton, power plant structure, shell and shell structure, towering TV tower and mast structure, bridge and hangar and other large-span structures, high-rise and super high-rise buildings. In the future, steel structures should be studied for high-strength steels, which greatly increase the strength of the yield point. In addition, new types of steels, such as H-beams (also known as wide-flange steels) and T-shaped steels and profiled steel plates, are required to accommodate large-span structures. And the need for super high-rise buildings.