In recent years, factories built with steel structures have become very popular.The steel structure is exquisite and affordable, the transportation and construction are convenient, and the industry is welcome, but the fire resistance performance is relatively poor.How to improve it? Let's see.1. Arched roof steel reinforcement insulation and fire prevention.Steel has high thermal conductivity and a thermal conductivity of 50W(m°C).When heated above 100°C, the tensile strength decreases and the plasticity increases.When the temperature reaches 250 °C, the tensile strength of the steel increases slightly, but the plasticity decreases, showing blue brittleness.When the temperature reaches 500°C, the strength of the steel drops to a very low level, which will lead to the collapse of the steel structure.Therefore, when the ambient temperature of the steel structure reaches 150°C or higher, it is necessary to develop an insulation and fire protection plan.2. Vaulted roof support system and roof plane.The roof support system should be reset according to the span, height, column grid arrangement, roof structure, crane tonnage and seismic fortification strength of the location area.In general, roof structures with or without a purlin system should be equipped with direct supports.In a purlinless system, the large roof slab welded on the truss has three points to support the chord, but considering the construction conditions and equipment requirements.3. Set the temperature expansion joint.Temperature changes can lead to deformation of the steel structure and structural temperature stress.When the factory slab standard is larger, temperature expansion joints should be set in the vertical and horizontal directions of the factory to prevent the temperature from being too high.The section length can be implemented according to the steel structure standard.Thermal expansion joints usually have double columns, and vertical thermal expansion joints provide rolling support at the roof support.4. Anti-rust treatment of vaulted roofs.The surface of the steel vaulted roof will rust when exposed to the atmosphere directly.When there is corrosive medium in the air of the steel structure workshop or the steel structure is in a humid environment, the corrosion of the steel structure workshop will become more and more serious.Corrosion of steel structures not only reduces the cross-section of components, but also rusts on the surfaces of steel components.When parts are stressed, it can lead to stress concentrations and premature structural failure.