Pre-Engineered building is a building with steel as load-bearing structure. Generally, beams, columns, trusses and other components made of section steel and steel plates constitute load-bearing structures. Together with the roof, floor, wall and other enclosure structures, it forms a whole building.

Building section steel usually refers to hot-rolled angle steel, channel steel, I-beam, H-beam and steel pipe. The building with load-bearing structure composed of its components is called profiled steel structure building. In addition, the load-bearing structure buildings formed by the thin-walled steel sections such as L-shaped, U-shaped, Z-shaped and tube-shaped formed by cold rolling of thin steel sheet, crimped or non-crimped, as well as the components made of small steel such as angle steel and steel bar, are generally called light steel structure buildings. There are also suspension structures with steel cables, which are also steel structures.

The steel has high strength and elastic modulus, uniform material, good plasticity and toughness, high accuracy, convenient installation, high degree of industrialization, and fast construction, but poor corrosion resistance and fire resistance, requiring frequent maintenance.

Advantages:

1. The construction time is greatly saved, and the construction is not affected by the season;

2. Increase the use area of residential space and reduce construction waste and environmental pollution;

3. The building materials can be reused to promote the development of other new building materials industries;

4. Good anti-seismic performance, easy to transform, flexible and convenient in use, bringing comfort to people, etc;

5. High strength, light weight, high safety margin of components, and low building cost;

6. In line with the sustainable development strategy, low carbon, green, environmental protection and energy conservation.

Disadvantages:

1. It is not fire-resistant and needs to be coated with fireproof coating;

2. It is easy to be corroded, and the surface needs to be coated with anti-corrosive coating to reduce or avoid corrosion and improve durability.