Steel structure is composed of steel and is one of the most important types of building structures. The structure is mainly composed of steel beams, columns, trusses, and other components made of section steel and steel plates, using rust and rust prevention processes such as silanization, pure manganese phosphating, washing and drying, and galvanizing. Welding, bolts, or rivets are commonly used to connect components or parts. It is widely used in large workshops, venues, super high-rise buildings, and other fields due to its light weight and simple structure.
Steel has advantages such as high strength, light weight, good overall stiffness, and strong resistance to deformation. Therefore, it is particularly suitable for the construction of large, super high-rise, and super heavy buildings; This material is an ideal elastic material with good uniformity and isotropy, which best conforms to the basic assumptions of general technical mechanics. And it also has good plasticity and strength, can have significant deformation, and can withstand dynamic loads well; Short construction period; High degree of industrialization, specialized production, and high degree of mechanization.

Features:
1. This material has the characteristics of high strength and light weight
Steel has high strength and high elastic modulus. Compared with concrete and wood, steel has a lower density and yield strength ratio. Therefore, under the same stress conditions, steel structures have the characteristics of small cross-section, light weight, easy transportation and installation, and are suitable for structures with large spans, high heights, and heavy loads.
2. This steel has good toughness, plasticity, uniform material, and strong structural reliability
Steel can withstand impact and dynamic loads, and has good seismic performance. Steel has a uniform internal structure and nearly isotropic homogeneous plasticity. The actual performance of the steel structure is more consistent with the Theory of computation. Therefore, the reliability of steel structures is relatively high.
3. High level of mechanization of structrual steel manufacturing and installation
Steel components are easy to manufacture in the factory and install on site. The steel structure component factory has advantages such as high precision, high production efficiency, fast assembly speed, and short construction period. Steel structure is the most industrialized structure.
4.Steel structure with excellent sealing performance
Due to the welding structure being able to achieve complete sealing, high-pressure vessels, large oil pools, pressure pipelines, etc. with good air and water tightness can be made. 
5. Heat resistant, non fire resistant steel structure
When the temperature is below 150 ℃, the performance of the steel does not change much. Therefore, steel structures are suitable for high-temperature workshops, but when the surface of the structure is exposed to thermal radiation of about 150 ℃, insulation boards should be used for protection. When the temperature is between 300 ℃ and 400 ℃, the strength and elastic modulus of steel significantly decrease. When the temperature is around 600 ℃, the strength of the steel tends to zero. In buildings with special fire protection requirements, steel structures must be protected with refractory materials to improve their fire resistance rating.
6. Steel structures with poor corrosion resistance
In humid and corrosive media environments, it is prone to rusting. Generally, steel structures require rust removal, galvanizing, or painting, and require regular maintenance. However, for offshore platform structures in seawater, special measures such as"zinc block anode protection"should be taken to prevent corrosion.
7. Low carbon, energy-saving, green and environmentally friendly, reusable
There is little Construction waste generated from dismantling steel structures, and steel can also be recycled.

Application program:
Compared with ordinary reinforced concrete structures, steel structures have the advantages of good uniformity, high strength, fast construction speed, good seismic performance, and high recovery rate. The strength and elastic modulus of steel are better than those of masonry and concrete. Under the same conditions, the weight of steel components is lighter. From the perspective of damage, steel structures have significant early deformation precursors and belong to ductile failure structures, so they can be detected in advance to avoid danger.
The advantages of steel structure factory buildings are light weight, save foundations, less materials, low cost, short construction time, large scale, safety and reliability, beautiful appearance and stable structure. Steel structure plants are widely used in large industrial plants, warehouses, cold stores, high-rise buildings, office buildings, multi-storey parking lots, residential buildings and other construction industry.

Steel structure installation:
Precast of steel components:
The prefabrication and erection of steel components are carried out on steel platforms according to the installation sequence and technological requirements, and the welding quality must be guaranteed.
The distance between the joint of splicing flange plate and the joint of section steel web should be greater than 200mm. The splicing length of the flange plate shall not be less than 2 times the width of the plate; The stitching width and length of web should not be less than 300mm and 600mm respectively.
To facilitate welding while ensuring welding quality, butt welding should be carried out on the steel platform on the ground as much as possible according to the dimensions of the construction drawing, and on the stiffeners, connecting plates, base plates, and beams (beams) on the columns and beams as much as possible.
Except manufacturing and assembling prefabricated steel components on steel platforms according to construction drawings and specifications, consideration should also be given to the manufacturability of on-site installation and changes in installation dimensions.