Difference between steel structure engineering and concrete engineering

Steel structure engineering has the advantages of light weight, good seismic function, high degree of industrial production, fast construction speed, beautiful building shape, favorable environment protection, large space and so on. The Ministry of construction calls it reusable and environment-friendly green building. Nowadays, with the shortage of sand and stone resources, the advantage of steel structure is more and more obvious.

1、 Advantages of steel structure engineering structure compared with general concrete structure

1. Steel structure engineering structure is steel concrete column + steel beam structure. Because the strength of steel structure is significantly higher than that of concrete, the section of structural column and beam is greatly reduced, and the consumption of concrete and steel bar is greatly reduced.

2. The steel concrete column improves the bearing capacity of the structural column, reduces the thickness of the steel plate of the column, improves the stiffness of the column and the corresponding lateral stiffness of the structure, and is conducive to improving the fire prevention capacity of the column.

3. The strength of steel structure is significantly higher than that of concrete, which makes it easier to obtain large space and improve the utilization rate of indoor space. In the past, there were concrete columns with large section in the room with slightly larger construction space, which affected the beauty and use. The section area of steel structure is smaller than that of steel concrete structure; Generally, the use area can be expanded by 5% - 10%.

4. The construction speed of steel structure project is fast. Considering the manufacturing cycle, installation cycle, material cost, management cost and other factors, the cost has economic advantages in the project with long construction period.

5. Steel structure parts are produced on a large scale in the factory with high machining accuracy, which is conducive to the accuracy control of on-site construction. Its error control is controlled by "mm"; The accuracy of concrete construction is controlled by "centimeter".

2、 Defects of steel structure engineering structure and general concrete structure

Steel structure engineering point of view, the main defects are anti-corrosion. There are two aspects of housing acquisition

1. The fire resistance function of steel structure is poor in case of fire, so it needs to be coated with fire-proof surplus concrete.

2. Corrosion and antirust treatment are needed during construction.

3. The deformation is larger than that of concrete structure. But multilayer structure is not significant.

In view of the advantages and disadvantages of the structural system of steel structure engineering, we think that it is appropriate to adopt the concrete core tube steel structure system, concrete-filled steel tubular columns and steel beams, and the floor slab is composite floor slab. Although the cost of steel structure is slightly higher than that of reinforced concrete structure, the overall cost is still lower than that of reinforced concrete structure, and its social benefit is serious, which is called green environmental protection construction, It was also a key field supported and developed by the state at that time.