Summary : The majority commonly admitted inside structural endeavours of Q235 iron within feverishness useful performance, disclosing the steel, however non-burning materials, but does not fire, described the incidence of metallic body matter metallic flame defence is a guideline defence problem, a iron blast of Technology Measures and their values and disadvantages.
Key words: steel; fire; useful properties; flame resistance
Of the burden As industrial and technological advance and the strategies of existence standards, makeup higher upwards on the super long-span spatial frameworks and the enlarging appeal for high-rise iron structure, wherever the iron is adept within the direction of greet the structural requirements of one of the supreme lightweight high-strength compounds [ 1]. At present, the kinds of architectural style, multi-trend, spawning iron has more room for development. As the metal body substance appear wide cross-section, thin, great thermal conductivity of iron (about 40 instants the concrete), and the technical properties of steel, the coldness sensitivity and other reasons, Fire Much reared than the danger of iron bolstered solid structure. The phenomenon of fire, sacrifice the transportation agree of iron structures, deformation increases, within a shorter time (10 ~ 20min) can draw plug the limitation say and even inside the fracture occurred. Therefore, contrasted with toughened real structure, iron body material flame is an unavoidable safety issues.
Temperature useful properties of constructive steel
To the most ordinarily used within very reasonable expertise of metal Q235 steel, for example, the crop strengths and elastic modulus and the ratio of the counterpart importance at room heat with the shine coldness curve.
In flame conditions, Q235 practical properties of steel, likened with the normal temperature, are fairly different.
(1) crop intensity with the gleam coldness rises. At 200'C, the crop power at room heat for 82.3%; at 400. C, room heat fruit strengths of 49.8%; at 600 benevolent cultures , the gather strength of merely 20.4% underneath room temperature.
(2) elastic modulus of the blast heat rises. 200. c, elastic modulus at room temperature 95.9%; at 400 care cornerstone , the elastic modulus at room temperature for 83.1%; at 600. C, the elastic modulus of only 17.1% at room temperature.
Thus, even so the non-burning material of steel, but does not fire. In the blast underneath big temperature, constructive strength and stiffness of metal will plunge rapidly. Therefore, as soon as construction with no glow defence of steel, the example of fire, the flesh is very prone within the direction of damage. For example, within October 2004, a city in Henan Province Home Appliances Discount flame burned the finish metal roof collapsed, kill 2 civilians deceased stationed in a severe pressure. The safety engineer site in the direction of your favorites
Steel framework fire-proof readings 3.1 refurbished flame hurdles Component in metal blaze intent on blaze surface barrier, and flame will be differentiated via metallic members, steered in Figure 2. For example, setting upwards of flames glossy lid metal rod below, in the setting of a sure breadth of the metal sends outside the blazes board. In this way, special vigilance must be joint, larvae L-dong Office, sealing, towards thwart channeling fire.
3.2 masonry grime thwart or poured concrete
Masonry mud clay quit or poured substantial with a entire closure of metallic structures, shown in Figure 3. This processes has the superiority of tall strength, impact resistance; drawback is the space busied via large. For example, with C20 concrete to shelter iron alloy column, the width of 5 ~ 10cm to perpetuate 1.5 ~ 3h of flames resistance. In addition, this strategy is moreover more very complicated construction, broadly in the hard metal beam, brace, works very difficult. China Stone Chemical industry Industry plant beforehand largely with brick edge Fire-resistant light-weight panel
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