Steel Buildings in Europe

Part 7: Fire Engineering 7 - 62 F4 : the number of storey F5 : the type of floor openings The sum of the total surface area shall not exceed 60000 m². According to the Table A.2, when the simplified procedure is used for structural components without requirements, the result is a maximum possible surface area of 10 000 m². When using the full verification procedure according to this table, a maximum surface of 30000 m² is possible. When using the full verification procedure in addition to the fire resistance calculation, then a 60000 m² surface area is possible. Under very special conditions, even larger surfaces, up to 120000 m² can be achieved. Example: The procedure and possibilities associated with MIndBauRl can best be shown and explained by an example: Building parameters Length: 100 m Width: 50 m Average height: 6 m Size: 5000 m² Number of storey: 1 Openings in the roof: 135 m² Doors, windows: 132 m² Fire load: q R = 126 kWh/m² Automatic fire alarm systems: Safety category K2 No internal fire walls The first possibility is the simplified method according to Table A.1. The industrial building must be equipped with an automatic sprinkler in order to meet the above conditions. In order to apply fully the full verification method, the equivalent fire duration must first be determined. In this case, the heat extraction factor w is needed. The heat extraction factor is determined by taking into account the related opening surfaces. The related opening surfaces are auxiliary values. This is simply a question of dividing the roof openings by the ground surface and then the wall openings by the ground surface.  Determination of the related horizontal opening surface a h : a h = A h / A = 135 m² / 5000 m² = 0,027