Do you know the causes of steel structure damage


Release time:

2022-10-19

The steel structure should be made of building steel as the main structure, characterized by steel columns, steel beams, truss structures and other prefabricated components made of steel and steel plates; The structure of welding, screw or riveting between components or components is one of the main types of building structures. If the steel structure is also damaged, we should find out and deal with it in time. Nanjing Tiandu Caigang summarized the following important factors for the destruction of steel structures in Nanjing: (1) insufficient structural bearing capacity due to load transformation, extended service, and changes in standards and technical specifications; (2) Prefabricated components are deformed, distorted, disabled, dented, etc. due to various accidents

The steel structure should be made of building steel as the main structure, characterized by steel columns, steel beams, truss structures and other prefabricated components made of steel and steel plates; The structure of welding, screw or riveting between components or components is one of the main types of building structures.
If the steel structure is also damaged, we should find out and deal with it in time. Nanjing Tiandu Caigang summarized the important factors of steel structure damage in Nanjing as follows:
(1) The structural bearing capacity is insufficient due to load change, extended service, and changes in standards and technical specifications;
(2) Due to various unexpected deformation, distortion, deformity, dents, etc. of prefabricated components, the cross-section of prefabricated components is weakened, the components swell and shrink, and the connection is cracked;
(3) The deformation, cracking and shrinkage of prefabricated components or connections are caused by temperature difference;

钢结构

(4) Erosion and electrochemical reaction due to chemical corrosion lead to weakening of the cross-section of prefabricated steel members;
(5) Others include errors in the design scheme, production and manufacturing, construction, and illegal use and use during the service period.
What anti-corrosion measures are available for steel structures?
Steel structure is one of the common building structures. In addition to factory buildings, it is also widely used in the construction of double-layer industrial buildings, large and medium-sized theatres, beam bridges and public buildings. In the concrete construction, the construction steel is often corroded due to lack of maintenance, which will affect the quality of the engineering structure and cause safety accidents such as building collapse. What are the countermeasures for corrosion prevention of the steel structure?
1. Plating method: The corrosion resistance of the plating method is generally lower than that of the long-term corrosion protection method. Therefore, there are many indoor steel structures and outdoor steel structures that are easy to repair. The plating cost is low at one time, but the outdoor maintenance cost is high.
2. Hot-dip galvanizing: hot-dip galvanizing is to infiltrate the iron castings after anti-rust treatment into the high-temperature zinc solution above and below 600 ℃ to make the steel surface adhere to a layer of zinc layer. The thickness of the zinc layer shall not be less than 65 on the metal sheet within 5mm μ m. No less than 86 for thick steel plate μ m。 So as to achieve the effect of corrosion resistance. It is characterized by long durability, high degree of industrial production and relatively stable quality. Therefore, it is used in the outdoor steel structure, which is seriously corroded by the atmosphere and is not easy to repair.
3. Hot-sprayed aluminum (zinc) composite coating: it is a long-term corrosion resistance method that has the same corrosion resistance effect as hot-dip galvanizing. It is characterized by strong integration of the size of prefabricated components, and the appearance and specification of components are basically unlimited. Large and medium-sized culverts and sluices are built in this way. In addition, the thermoelectric effect of the process technology is local and limited, so it will not cause thermal expansion. Compared with hot-dip galvanizing, this process has a low level of industrialization, high intensity of aluminum (zinc) spraying, and particularly sensitive to the emotional fluctuations of operators.
4. Rusted steel plate: The corrosion resistance of rusted steel plate is better than that of general steel structure. It contains phosphorus, copper, nickel, chromium, titanium and other metals, which can produce a protective layer on the metal surface to improve corrosion resistance. In addition, its ultra-low temperature fracture toughness is also better than that of general steel structure steel.