Steel structure is a structure composed of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of section steel and steel plates.The characteristics of steel are high strength, light weight, good overall rigidity, and strong resistance to deformation. Therefore, it is particularly suitable for the construction of large-span, super-high and super-heavy buildings; the material has good homogeneity and isotropy, which is ideal elasticity The structure is most in line with the basic assumptions of general engineering mechanics; the material has good plasticity and toughness, can have large deformation, and can withstand dynamic loads well; the construction period is short; its industrialization degree is high, and it can be specialized production with a high degree of mechanization.