Usually in the construction industry commonly used steel structure has many advantages such as light weight, recyclable materials, etc., but due to the characteristics of the steel itself can not be resistant to high temperatures, affecting the safety of the steel structure building, hindering the development of steel structure manufacturers.
1, the application of building fire-resistant, weathering-resistant steel general steel fire resistance is poor, but can be through the relevant technical means, change the material composition of the steel, add specific components, change the structure and metallurgical organization of the steel, to improve the fire resistance and weathering resistance of the steel itself. This is the fire-resistant, weathering-resistant steel. This steel at a temperature of 600 ℃, the strength of less than 30% decline, in addition to its fire resistance table is better, you can reduce the appropriate thickness of the protective layer in the construction, and even can not be coated with antirust paint, so that you can save a certain amount of cost. Application of fire-resistant, weather-resistant steel is the cure, should be vigorously promoted, at present, China has a number of enterprises can produce fire-resistant, weather-resistant steel for construction, which provides a good source of materials for steel structure buildings.
2, the use of fire-resistant structural forms and components of pure steel structure of the fire resistance is relatively poor, but can be properly combined with the concrete composition of mixed components, or in some key areas directly using reinforced concrete structure. For example, columns can be used steel pipe concrete columns, which can be very effective in improving the fire resistance limit, and the larger the diameter of the steel pipe, the longer the fire resistance time, the diameter of 500mm round steel pipe concrete columns, when coated with a thickness of 15mm thermal insulation fireproofing coatings to meet the fire resistance time of 3h. And like the floor and staircase, such as higher fire resistance requirements of the components or should be used as far as possible reinforced concrete structure.
3, to take reasonable steel components fire structure processing program steel structure fire protection construction practices should be reasonable, strong, economical, easy to construct, and conducive to the decoration. When there are non-combustible enclosing or separating components and steel components in the same axis, the non-combustible wall itself can be utilized to provide fire protection for steel components without doing another fire protection layer. And for those exposed steel components, should be used reasonable fire protection construction practices.
4, the implementation of effective fire protection methods commonly used steel structure fire protection methods are wrapped concrete protection, wrapped steel wire mesh cement mortar, wrapped fireproofing panels and spraying fireproof coating. Outsourcing concrete protection is to use concrete to steel components completely wrapped up in the concrete should also be configured in the structure of reinforcing bars to prevent the concrete from falling off. Steel wire mesh cement mortar fire protection is a metal mesh with 50# mortar as a protective layer, is also a traditional construction method. Outsourcing fireproof board can choose fiber reinforced cement board, gypsum board, calcium silicate board, vermiculite board and other non-combustible materials of fireproof board to wrap up the steel components.
5, the fire resistance of steel structure depends on steel, steel itself does not burn, also has good heat resistance, based on this physical property of steel, steel structure, this green building structure form has been quite popular in developed countries, don't let the fire resistance hinder the footsteps of the steel structure manufacturers, we should actively take all kinds of effective measures to improve the fire resistance of the steel structure and accelerate the development of steel structure.
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