What is steel structure prefabricated and the advantages and disadvantages of steel structure prefabricated
Steel structure prefabricated is a structure composed of steel and is one of the main types of building structures. Steel structure prefabricated is mainly composed of section steel, steel column, steel truss and other section steel and steel plates, using silanization, pure manganese phosphating, washing and drying, galvanizing and other rust and rust prevention processes. The parts are usually connected by welding, bolts or rivets. Because of its light weight and simple structure, it is widely used in large-scale factories, stadiums, super high-rise buildings and other fields.
Steel structure prefabricated steel features: high strength, light weight, good overall rigidity, strong resistance to deformation, especially suitable for large-span, ultra-high, and ultra-heavy buildings; material uniformity and isotropy are good, and the elastic body is ideal. In line with the basic assumptions of general engineering mechanics, the material has good plasticity and toughness, large deformation, strong dynamic load capacity, high degree of industrialization, and high degree of mechanization for specialized production. steel structure prefabricated has good heat resistance.
But the fire resistance of steel is poor: the test results show that when the performance of steel changes from room temperature to 150°C, the strength and plasticity change from room temperature to 150°C, the strength drops to zero, and the bearing capacity is completely lost. Half of the steel structure prefabricated fire resistance grade is wrapped by concrete or bricks. When the thickness of the fireproof coating is 15 mm, the fire resistance limit of steel components can reach 1.5h. In the environment of high humidity and corrosive medium, steel structure prefabricated is susceptible to corrosion, and the cross section is weakened, which will damage the structure and affect the service life. Therefore, the steel structure prefabricated needs regular maintenance.
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