What are the factors that affect the durability of steel structure steel

The construction quality of steel structure workshop will continue to develop and change with the change of the outside world and the extension of time, and the quality defects gradually manifest. For example, the weld of the steel component due to the change of stress, so that the weld without cracks in the original crack: due to the action of hydrogen activity in the weld after welding can produce delayed cracks. If the member is overloaded for a long time, the steel member should produce bending deformation of the lower arch, resulting in hidden dangers.

The process is very important in processing components quality, its quality is strongly influenced by on process, strengthen the monitoring process before the assembly is very important. The quality problems caused by this process are mainly shown in the following aspects: the position of the assembled parts is wrong, such as the 3450mm is packed into 4350mm; Incorrect use of parts, instead of assembling another part 3# instead of assembling part 2#.

Light weight: the weight of the combined house is about 15~30kg/m2. The assembly is simple and fast: all the components and plates of the house are prefabricated in the factory and transported to the site with bolts, tapping screws, rivets and other connectors for assembly. Housing construction speed is very fast, according to different types of housing, generally 1 worker can install 20~50m2 in 1 day. A two-story, 200-square-meter composite house can be installed by six workers in a day and a half, and can be put into use immediately. It is a highly industrialized steel structure building with finalized design standards and flexible combination. Component manufacturing factory production, high processing precision, good quality.

There are many factors affecting the durability of steel. First, the corrosion resistance of steel is poor, and protective measures must be taken to prevent corrosion and rust of steel. Protective measures are: the regular maintenance of steel paint, are made of galvanized steel, with acid, alkali, salt and so on under the condition of strong corrosive medium, the use of special protective measures, such as offshore platform structure using anodic protection measures to prevent the corrosion of jacket, catheter frame fixed on zinc ingot, water electrolyte will automatically first corrosion of zinc ingot, so as to protect the function of steel jacket. Steel frame structure metal high temperature anticorrosive paint is to provide anticorrosive protection for steel structure under high temperature coating, dense acid and water vapor, heat and high temperature resistance.

Steel metal high temperature anti-corrosion paint the corrosion protection performance is embodied in two aspects: one is for steel structure in the environment of water vapor corrosion material such as shielding effect; The second is the resistance to high temperature, to ensure that the coating in high temperature environment, still can firmly adhere to the surface of the steel structure, to provide anti-corrosion protection.