What is the fire-resistant time of steel column under steel structure?
The steel structure is generally 450 to 650 degrees Celsius in temperature will lose the bearing capacity, big deformation, resulting in steel column and beam bending, the results caused by excessive deformation can't continue to use, generally without steel structure fireproof limit protection for 15 minutes. The length of time is also related to the speed of heat absorption of the component.
In order to make the steel structure materials overcome the shortage of fire protection in practical application, fire prevention must be carried out, the purpose of which is to raise the fire resistance limit of the steel structure to the limit range prescribed by the design specification. To prevent the deformation of steel structure in heating in the fire quickly, the measure is varied, the key is to adopt different methods according to different situations, such as the use of thermal insulation and refractory material directly blocking flame burning steel structure, reduce the heat transfer rate of temperature rise, steel structure to postpone the weakening time. But whatever the method, the principle is the same. Here are some different steel structure fire protection measures.
Steel is a building material that does not burn. It has the characteristics of shock resistance and bending resistance. In practical application, steel can increase the load capacity building relative, can also meet the needs of architectural design modeling, but also to avoid the defects of concrete building materials cannot bend, stretch, so the steel construction industry has been favored, monolayer, multilayer, skyscrapers, factories, warehouses, waiting rooms, lounges etc. the steel is very common. However, as a construction material, steel has some unavoidable defects in fireproofing, and its mechanical properties, such as yield point, tensile strength and elastic modulus, all decrease sharply due to the increase of temperature.
