In fact, it is a kind of steel structure, which is classified as a building structure type. The composition of this material mainly comes from steel, steel plate and other series of steel.

Although China made outstanding achievements in iron structure in its early days, it remained at the level of iron construction for a long time. It was not until the end of 19 that China began to adopt modern steel structures. After the founding of New China, the application of steel structure has made great progress, both in quantity and quality.