Most of the main load-bearing components of modern buildings rely on strong and light steel, which endows the building with a wide, light and stable architectural style. Steel structures will not burn under the action of fire, but under the direct burning of high-temperature flames, the strength of steel will decrease as the temperature rises. When it reaches a critical point (usually 500 °C), it will It will significantly reduce the strength and lose the bearing capacity. Due to the high temperature, the steel will soften rapidly after 15-20 minutes, which will cause the entire building to lose its stability and lead to collapse. In fact, due to the effects of various factors, some steel structures generally only need 10 minutes to lose their supporting capacity in a raging fire, and then deform and collapse.
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It takes a period of time from the start of a fire to its extinguishment, and what is done during that time is important to save lives and minimize damage to buildings and valuables. In a major fire, unprotected buildings can be damaged within minutes. How hot is the fire? Paper and wood are fibrous, and can reach 556 °C after 5 minutes, and 945 °C after 1 hour. After gasoline or solvent etc. are ignited by similar fuels, Smin can reach 926 °C, and can reach 1165 °C after 1 hour.
The method of flame retardant using fire retardant coatings is considered to be one of the effective measures. Fire retardant coatings for steel structures play an important protective role in 90% of steel structure fire protection projects. Applying fire retardant paint to the surface of the material, in addition to its decorative and protective functions, due to the non-combustibility and flame retardancy of the fire retardant paint itself, it can prevent the flame from spreading and delay the spread of the fire when a fire occurs, and better protect the steel structure. , Gain precious time for fire fighting and personnel escape.
