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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:610
钢结构厂房以钢柱、网架为主要支撑方式,因而钢结构的耐火极限决定了厂房的抗火灾能力。根据《钢结构设计规范》(GB50017-2003)钢结构厂房主要采用碳素结构钢和低合金高强度结构钢为主要材料。通常,在全负荷的情况下失去静态平衡稳定性的临界温度为540℃左右,总体机械性能随温度的不同而有变化,一般结构温度达到350℃、500℃、600℃时,强度分别下降1/3、1/2、2/3。在火灾中,火场温度通常会达到800~1200℃,在这样的环境下,具有较高导热性能的钢结构一般会在15min左右,就会出现塑性变形,产生局部损坏,并彻底丧失承载能力导致整体垮塌。

其中,不同墙体材料及温度特性,对钢结构的内部温升和在高温下的受力变形会产生一定影响。现有钢结构厂房中,通常采用夹芯板作为间隔墙和外墙,内部以具有较高保温性能的聚苯乙烯、聚氨酯和岩棉等作为填充材料。前两者材料的耐火性能较差,易受热燃烧,会增大建筑火灾荷载,加快钢结构的温升,降低抗火灾能力。而岩棉本身属无机质硅酸盐纤维,不可燃,燃烧性能取决于其中粘接剂的类型和数量。一般情况下,金属夹芯板的耐火极限约10min左右即失去承重功能而垮塌。



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.



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