Those belong to the steel structure
All steel and iron bars, plates, pipes, profiles made of various components, these components to bolt, rivet, weld joint method of composition, used to resist all kinds of load structure, called steel structure.
Steel structure is mainly made of steel, and it is one of the main types of building structures. Steel structure is one of the common structural forms in modern architectural engineering. China is the earliest use of iron bearing structure manufacturing countries in emperor era (246-219 BC), has been made of iron bearing has the advantages of simple structure, while the western countries in seventeenth Century began to use metal bearing structure. In the 3-6 century, smart and hard-working Chinese people will use the chain construction of cable suspension bridge, the famous Sichuan Luding Dadu River Bridge, Jiangqiao Yunnan yuan and Guizhou plate Jiangqiao are bearing structure of early iron China's example.
General industrial plants are largely the door type steel structure or steel bent frame structure of the gas station, sports management and the stadium roof is mostly frame or truss structure are now high-rise steel structure is the combination of these belong to steel structure
