The raw material used in the steel structure is steel. Compared with concrete wood, steel is stronger, lighter easier to transport install. Suitable for large span, high height, load-bearing structure, such as steel structure workshop, gymnasium, Super high-rise other fields. its toughness, good plasticity, material is more uniform, so the reliability of the structure is higher. Steel structure is one of the main types of building structure, which is composed of steel plate connected by hot-rolled, cold-bent welding materials. In addition, the steel structure also has the advantages of good sealing, energy-saving environmental protection, can be used as a large oil pool, pressure pipelines. But the steel heat-resistant fire-resistant, corrosion resistance is also relatively poor, so in the use of the process needs regular maintenance maintenance. Steel structure is widely used in engineering construction, in addition to the use mentioned above, but also can be used as steel bridge, Steel Workshop, Steel Gate, a variety of large-scale pipe containers, tower rail structure.

In the industry, steel structure engineering can generally be divided into light steel structure, high-rise steel structure, residential steel structure, bridge steel structure Space Steel Structure 5 categories. 1, light steel structure. It is mainly used in load-bearing buildings which can bear heavy loads. Light-duty h-section steel is used as door-type steel frame support, C-type Z-type cold-formed thin-wall steel is used as wall beam, profiled steel plate is used as roof envelope structure, with seismic resistance, wind resistance, durability, thermal insulation, sound insulation other characteristics. High-rise steel structure. Generally refers to six more than 30 meters, the use of steel, steel plate connection welding the structural system, in modern high-rise, super-high-rise steel structure is widely used. 3. Residential steel structure. Is a new type of building structure system, it is the cross-section of H-, z- U-shaped steel members connected by the main frame of the house, then use the board as a roof wall, with doors windows to form a complete building system, with low cost, light weight, beautiful appearance, short construction cycle so on. Bridge steel structure. It is mainly used for bridge structure, the main material is steel plate, section steel high-strength steel beam, because of its long-term humid environment, it is easy to rust, high maintenance costs. 5. Spatial steel structure. Generally speaking, it is a steel structure with a large span, such as factory buildings, gymnasiums, bus stations, train stations, airports, etc. . The bird's nest is a typical representative of spatial steel structures, it has the characteristics of complexity diversity.