Steel structure refers to a building structural system that utilizes steel as the main component and load-bearing body. Steel structures are commonly used in large and special construction projects such as industrial factories, commercial buildings, bridges, and high-rise buildings.

Steel structures have the following characteristics:

1. High strength and lightweight: Steel has high strength and low self weight, which can withstand large forces and reduce the building's self weight.

2. High utilization rate of building space: Steel structures can achieve large-span overhangs and large columnless spaces, improving the utilization rate of the building.

3. Fast construction speed: Prefabricated steel components are used for construction, which can be manufactured in the factory and then assembled on site, which is faster than traditional concrete structure construction speed.

4. Good flexibility and toughness: Steel structures have good plasticity and toughness, which can withstand the impact of natural disasters such as earthquakes and wind, and improve the safety of buildings.

5. Recyclability and Sustainability: Steel can be recycled and reused after its service life, reducing resource waste and environmental pollution.

The design and construction of steel structures need to consider various mechanical and structural engineering principles to ensure the safety, stability, and durability of the structure. At the same time, it is necessary to comply with national and local building regulations and standards.