This specification is formulated in order to implement the country's technical and economic policies in the design of steel structures, to achieve advanced technology, reasonable economy, safety and applicability, and quality assurance. This code is applicable to the steel structure design of industrial and civil buildings and general structures. Among them, the components made of cold-formed steel and their connections shall comply with the current national standard "Technical Specifications for Cold-Formed Thin-walled Steel Structures" GB 50018.