The characteristics of steel are high strength, light weight, good overall rigidity, and strong deformation ability, making it particularly suitable for constructing large-span, ultra high, and ultra heavy buildings; The material has good homogeneity and isotropy, and belongs to the ideal elastic body, which best conforms to the basic assumptions of general engineering mechanics; The material has good plasticity and toughness, can undergo significant deformation, and can withstand dynamic loads well; Short construction period; It has a high degree of industrialization and can carry out specialized production with a high degree of mechanization.