Industriality Metal structures are manufactured in factories, equipped with special equipment, and Monte is done with the use of high technology. All this eliminates or reduces to a minimum manual labor. With regard to the maintainability of steel structures is most easily addressed the issue of strengthening, modernization and reconstruction. With the help of welding can be easily attached to the elements of the existing frame new technological equipment, with the need to strengthen those elements that also made strongly enough. Conservation of metal stock. Metal structures as a result of physical aging and maralnogo withdrawn from service, and then returned to the industry sector in the form scrap metal. The disadvantages of metal structures is their susceptibility to corrosion and a relatively small fire. Corrosion – destruction of metal by chemical or electrochemical action with vneyshey environment.
Steel, is not protected from contact with moisture, combined with aggressive gases, salts, dust, rust (oxidized), which leads to its gradual destruction. Aluminum and its alloys have some relatively high resistance to corrosion, due to the formation on the surface of a solid oxide film. Many alloys are not resistant to electrochemical corrosion. Good resistance to corrosion of cast iron. To improve corrosion resistance of metal on their surface coatings are applied as thin films of aluminum, zinc, enamel, paint, etc. When designing structures avoid crevices and cavities, which can accumulate moisture and dust. Sometimes using steels with improved corrosion whose composition includes special alloying elements. Fire-resistance design is characterized by the degree of fire safety.
Metal Rods have a relatively low fire resistance. At high temperatures (for steel – 600 C for aluminum alloys – 300 C) metal structure loses its bearing capacity. Increased fire resistance of steel structures of buildings, a fire hazard ratio (residential and public buildings, warehouses, flammable or highly flammable materials), is accomplished by eliminating direct contact with open designs fire. For this purpose include suspended ceilings, ognstoykie cladding, coating by special structures. Using special coatings in the form of coatings, can significantly increase the fire resistance. With proper design and operation of the respective deficiencies noted are not dangerous to perform their design functions, but also lead to an increase in initial and operating costs.