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Steel construction fire resistance rating in the practical application of the transformation

Reinforced cement board (such as the TK board, FC board), gypsum board, calcium silicate board, vermiculite and other non-combustible materials, stone fire board to steel members wrapped up. Third, spray steel structure fire. Shitu the steel structure fire at the steel surface to form a protective layer of fire-resistant insulation. Steel structure fire under high temperature coatings based on changes in inflation and non-expansion of sub-two series. Intumescent fire retardant coating, also known as ultra-thin fire retardant coating, the thickness is generally 1rnm ~ 3l'al'n, the base material for the organic resin, flame retardant system for ammonium polyphosphate, pentaerythritol, melamine. Expansion of a fire spontaneously to form a thick coating than the original ten times to several times the porous carbon layer, used for steel structure fire protection, fire resistance of up to 0.5h ~ 1.5h; non-intumescent fire retardant coating, thick coating, also known as flame-retardant coating, thickness of the 7mm ~ 5Ornrn, the main components of inorganic insulation material, fire does not expand, its good insulation, fire resistance and thickness of the corresponding up to 0.5h ~ 3h. Fourth, jet fire protection layer of inorganic fiber, inorganic fiber material has low density, high heat capacity, low thermal conductivity of the salient features, and with good adhesion, high temperature fire, the thickness did not change significantly, retaining layer does not melt, does not fall off, enabling components to be protected up to 5 hours of fire resistance, fire resistance requirements, especially for relatively high level of fire protection of steel bodies. For example: load-bearing pillars of the present to do a lot of steel columns, steel beam to do with the color plate of iron frame construction,[link widoczny dla zalogowanych], in accordance with the column in accordance with the , will be able to reach the secondary fire resistance standards. In addition, a small number of international steel construction with water cooling for fire protection of steel structures. The protection of steel structures had not yet been adopted in our approach. At home and abroad to take on the steel surface is usually sprayed or painted materials or fire protection of steel structures and other measures refractory inclusions are not direct flame grill and improve its fire resistance capability. Steel building fire at home and abroad both positive and negative experience has shown that the quality of fireproof coating, aging, coating adhesion, whether the use of loose, cracked, or whether they are a big shock, vibration and so on will directly affect the fire safety of steel members,[link widoczny dla zalogowanych], should lead to relevant departments. To this end, relevant departments should strengthen the research, and further take effective safety measures to protect the steel structure building (structure) of fire safety. From the current situation, in particular to study the fire resistance, long time, the high adhesion of the new steel structure fireproof materials; development of cheap and high temperature metals, non-metallic materials and composite fire light steel structure, high strength, new materials such as concrete fire resistance and further improve the fire resistance of steel structures should be of architectural, engineering and fire industry a new topic. Fire resistant design of steel structure design and even building fire, resulting in an unsafe structure or structure of the major waste problem lies in the rigid norms apply,[link widoczny dla zalogowanych], no specific analysis of specific buildings. Use of different building because of its different functions, the factors inducing fires,[link widoczny dla zalogowanych], fire load, spread way, the heating process, and the fire duration is different. Should be used for architectural features and functions, a careful analysis of the random fire, the establishment of realistic fire model: Identify parts of fire-prone; calculation of fire loads; determine the way the fire spread; determine the direction of high temperature gas diffusion: Calculation of temperature rise curve (taking into account the response time of automatic fire extinguishing system and cooling); analysis of local damage and structural components redistribution of internal forces; to determine the direction of structural collapse. In the established fire model based on the integrated use of fire and fire safety design. Steel with high strength, light weight, good seismic performance,[link widoczny dla zalogowanych], construction progress fast, small footprint structure, high degree of industrialization, a series of advantages compared it with the concrete structure, environment and more conducive to the development of construction industry. Thus high-level, high-rise building, and some have special requirements for industrial and civil use more steel. Currently, relevant departments are studying further expansion in housing construction in the use of steel. But from the perspective of fire, steel, although the body does not burn, but very resistant. As low cost of concrete, plasticity, fire resistance, low maintenance advantages of maintaining the current structure of reinforced concrete in residential construction is still the most widely used structural material. Thereby increasing the fire resistance of steel is the key to promoting steel construction, only by improving the fire performance of steel to give full play to the advantages of steel energy-efficient buildings. West Port Court, the military Editor