寿县合兴浅谈钢结构厂房的抗火灾能力发布时间：2015/9/7 9:23:18 浏览次数:675
Steel structure workshop is mainly made of steel column, rack support way, thus the fire resistance of steel structure determines the fire resistance of the plant. According to the specification for design of steel structures (GB50017-2003) of steel structure workshop mainly adopts carbon structural steel and high strength low alloy structural steel as the main material. Usually, in full load under the condition of losing stability of static balance critical temperature about 540 ℃, with the type of overall mechanical properties with temperature changes, the general structure temperature of 350 ℃, 500 ℃, 600 ℃, the intensity decreased 1/3, 1/2, 2/3 respectively. In the fire, the fire temperature often up to 800 ~ 1200 ℃, in such an environment, tend to have higher thermal conductivity of steel structure in about 15 min, plastic deformation will occur and produce local damage, and to lose bearing capacity cause the overall collapse.
Among them, the different wall materials and the temperature characteristic, the internal temperature of steel structure and the forced deformation of the high temperature is going to have an impact. Existing steel structure workshop, usually using sandwich board as interval wall and exterior walls, interior to have high insulation performance of polystyrene, polyurethane and as a filler material such as rock wool. Before both the refractory material performance is poor, easy to heat burning, will be building fire load increase, accelerate the rise of temperature of the steel structure, reduce the ability to resist fire. And rock wool itself belongs to the inorganic silicate fibre, nonflammable, combustion performance depends on the type and amount of adhesive. In general, the fire resistance of metal sandwich board for about 10 min or lose bearing function and collapse.