How is grade of fire endurance divided?
Fire resistance level is mainly decided according to the importance and function of the building. For example, very important buildings are set as the first level, and the less important is the second level, and so on.
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Does anyone know about grade of fire resistance? How is grade of fire endurance divided?
Level of the building is classified according to the importance, fireproofing, durable life and etc. different angles. Civil buildings are classified according to the following ways: 1, It is divided into five grads according to its importance: A, AAA level: Buildings with great memorial, of historic, international and national level. B, A level: High-grade residential buildings and public buildings. C, B level: Intermediate residential buildings and public buildings. D, C class: Ordinary residential buildings and public buildings. 2, It can be classified into four types according to the fireproof performance: Fire resistance level of the buildings is divided into four levels. Standard of fire resistance level is decided based on the combustion performance and fire endurance of the main components of the building. 3, It can be classified into four levels according to the durable life: A, A level durable life is more than 100 years. It is applicable for important buildings and high buildings. B, B level has a endurance for 50 to 100 years and it is applicable for ordinary buildings. A, C level has a durable life of 25 to 50 years. It is applicable for less important buildings. B, D level has a lasting year of below 15 years and it is applicable for temporary buildings.
Fire resisting shutter is divided into Class A / B / C, and the relevant fire endurance are not less than 1.2 /0.9 /0.6 hours, see "General technical conditions for steel fire resisting shutter GB 14102-93". 4.3 4.3.1 Classification according to time of fire resistance 4.3.1 Ordinary steel fire resisting shutter (see Table 3) Table 3 and Category Code Refractory time hF1 1.5F2 2.04.3.2 Composite steel fire resisting shutter (see Table 4). Table 4 and Category Code Refractory time hF3 2.5F4 3.04.4 Classification according to refractory time and smoke prevention performance 4.4.1 Ordinary steel fire and smoke resisting shutter (see Table 5) Table 5 category and code refractory time h smoke leakage (20Pa differential pressure) FY1 1.5 ≤0.2m3 / m minFY2 2.0 ≤0.2m3 / m min4.4.2 composite steel fire and smoke resisting shutter (see table 6) table 6 category and code refractory time h smoke leakage (20Pa pressure) FY3 2.5 ≤0.2m3 / m minFY4 3.0 ≤0.2m3 / m min Excerpt completed. Fire shutter used as fire compartment has a fire resistance of 3 hours, and fire shutter set on the upper opening part on the firewall has a fire resistance of 1.2 hours. **** Materials with fire resistance of 3.0 hours are called AAA refractory material (back fire surface). "Building Conventions" have mentioned in places where it is really difficult to set a firewall, fire shutters can be used to separate fire compratment. When using fire shutters whose back surface temperature rise is included as the judging criteria of fire resistance, its fire resistance should be not less than 3.00h; When using fire shutters whose back surface temperature rise is not included as the judging criteria of fire resistance, independent protection of closed automatic water spraying system should be set on the both sides of the shutter, and the duration of water spray should be not less than 3.00h. In summary: Fire shutter is divided into: Grade AAA, A, B and C
