steel structure

Steel is characterized by high strength, light weight, good overall stiffness, and strong resistance to deformation, so it is especially suitable for the construction of large-span and ultra-high and super-heavy buildings; The material has good homogeneity and isotropy, belongs to the ideal elastic body, and good conforms to the basic assumptions of general engineering mechanics; The material has good plasticity and toughness, can have large deformation, and can bear dynamic load well; Short construction period; It has a high degree of industrialization and can carry out specialized production with a high degree of mechanization.

High strength steel should be studied in steel structure to greatly improve its yield point strength; In addition, it is necessary to roll new types of steel, such as H-shaped steel (also known as wide flange steel) and T-shaped steel and molded steel plates to meet the needs of large-span structures and super high-rise buildings.

In addition, there is a heat-free bridge light steel structure system, the building itself is not energy-saving, the technology solves the cold and hot bridge problem of the building with clever special connecting parts; The small truss structure makes the cable and water pipe pass through the wall, and the construction and decoration are convenient.

peculiarity

1, high material strength, light weight

The strength of steel is high, and the elastic modulus is also high. Compared with concrete and wood, the ratio of density and yield strength is relatively low, so under the same stress conditions, the steel structure has small section, light weight, easy transportation and installation, and is suitable for the structure with large span, high height and heavy load.

2, steel toughness, good plasticity, uniform material, high structural reliability

It is suitable for bearing impact and dynamic loads and has good seismic performance. The internal structure of steel is uniform, which is close to isotropic uniform body. The actual performance of the steel structure accords with the calculation theory. Therefore, the steel structure has high reliability.

3, steel structure manufacturing and installation of high degree of mechanization

Steel structure components are easy to be manufactured in the factory and assembled on the site. The factory mechanized manufacturing of steel structure components has high precision, high production efficiency, fast site assembly speed and short construction period. Steel structure is a good industrialized structure.

4, the steel structure sealing performance is good

Because the welded structure can be completely sealed, it can be made into high pressure vessels with good air tightness and water tightness, large oil pools, pressure pipelines, etc.

5, steel structure heat resistance is not fire resistant

When the temperature is below 150℃, the steel properties change little. Therefore, the steel structure is suitable for hot workshops, but when the surface of the structure is subjected to thermal radiation of about 150 ° C, it is necessary to use heat insulation panels to protect it. The temperature is 300℃ -400℃. The strength and elastic modulus of steel are significantly reduced, and the strength of steel tends to zero when the temperature is about 600℃. In buildings with special fire protection needs, the steel structure must be protected by refractory materials to improve the fire resistance grade.

6. Poor corrosion resistance of steel structure

Especially in the environment of wet and corrosive media, it is easy to rust. General steel structure to remove rust, galvanized or paint, and regular maintenance. For the offshore platform structure in seawater, special measures such as "zinc block anode protection" should be adopted to prevent corrosion.

7, low carbon, energy saving, green environmental protection, reusable

The demolition of steel structures almost does not produce construction waste, and steel can be recycled.