Different fire protection measures and reinforcement measures for damage of steel structures

Steel structure reinforcement technical measures mainly include: three section reinforcement method: in the local or along the whole length of the member reinforcement as a whole, common let force; Change the calculation diagram: increase support, adjust the load distribution, reduce the pressure level, statically indeterminate structure support forced displacement, reduce the peak stress; Prestressed anchor cable reinforcement method: the weak link of the structure, improve the bearing capacity, stiffness and stability of the whole structure, the use of high strength cable. In recent years, steel structure has been favored by building lines, single-storey, multi-storey, factories, warehouses, waiting rooms and so on. Lounge with steel is very common, but the main surface of steel fire building materials has some inevitable defects, its mechanical properties, such as the yield point, tensile elastic modulus will fell sharply due to the rise of temperature, the bearing capacity of the steel structure will usually be in heat loss, large deformation, cause the steel column of fire retardant coating, steel structure beam bending, Results caused by excessive deformation can't continue to use, generally don't have to about 20 minutes of steel structure fire protection, in order to make the G fire steel material shortage in the course of practical application, the processing needs, its purpose is to improve the fireproof performance of steel O within the limits of the steel structure design codes, the measures to prevent the fire quickly deformation temperature is varied, Different methods are used according to different situations, such as insulation, refractories, and direct combustion of steel structures to reduce the rate of heat transfer, but the temperature rise of steel structures is delayed at the same time. However, regardless of the seed preservation method used, the principle is the same, as are the fire protection measures for different steel structures. Cladding is the addition of an outer layer to the surface of the steel structure, which can be sprayed or sprayed. Cast-in-place concrete is usually reinforced with wire mesh or steel bars to suppress shrinkage cracks and ensure shell strength. The spraying method can form a protective layer on the construction site of steel structures, covering the surface of sand soil, which can be cement or gypsum mortar, or mixed with perlite or asbestos. While the outer layer may be made of perlite, asbestos, gypsum or asbestos-cement and lightweight concrete, the prefabricated panels are made of adhesives, nails and bolts from the steel structure. Filling water (water jacket) and hollow steel structure with water is the most effective fire protection measure. This method allows the steel structure to remain cold during fire and circulate water, circulating and absorbing heat from the material itself in the steel structure. The cooled hot water can be recycled, or heated water can be cooled from pipes into cold water. Protective cover: steel structure arranged in the refractory wall or ceiling, or hidden in the wall between the two components of the gap, as long as a little increase or increase in refractory materials can achieve fire prevention purposes. This is the most economical way to prevent fire. There are many measures for steel structure fire prevention. Different steel construction and different fire protection measures are good in all respects. The safety and quality of steel structure are better. At present, high-rise steel structure buildings are increasing, especially some super high-rise buildings, steel structure materials are more and more extensive. High-rise building fire accident, fire is not in a short time can be put out, which requires us to design a building, increase the fire protection of building materials, in order to improve its fire prevention ability, and develop the necessary emergency plan, in the building, reduce casualties and property losses.