Numerical Simulation Analysis Of Office Building Fire Based On FDS

With the acceleration of urbanization, more and more high-rise buildings in the city appeared, however troubled building fire safety issues have not been a good solution. As the main office, office building have a wide range of fuel a large number of high probability of occurrence of fire. In case of fire, high temperature gas fires will spread through the corridors and stairwells in the entire building, life in this office building will bring huge threat, but also cause huge irreparable economic losses. Therefore, the study of fire smoke have a very important role in the spread of the office building.This paper studies the flue gas flow conditions in the office building. Firstly, the physical model of office building was established by pyrosim. Then the fire type, combustion, release rate and the fire growth factor and other fire-related parameters was choosed reasonability, for subsequent FDS simulation done enough preparation. Finally, using a large eddy simulation method, the spread of fire smoke condition in the office building and underground garage to do a comprehensive simulation study. By Pathfinder personnel office building evacuation to do a detailed analysis.Simulation results show:(1) Whether it is opened or closed windows, high-temperature fires have already exceeded the limits of the human body to endure. Staff in the room will pose a serious threat. For the smoke layer height and smoke layer visibility is concerned, new fresh air from the windows into room the fire and smoke will be produced by mixing, resulting in the disturbance of the smoke layer height and visibility. However, when the window is closed, the smoke layer height decreases rapidly after the fire broke out in the 50 s to 1m below, it is not conducive to people escape. Floor corridors and other temperature changes are mainly influenced by the flue gas of thermal radiation, but are lower than the body’s tolerance’s temperature, The higher the floor, the more powerful fumes settlement.(2) Ignition source inside the second floor room at the time, almost no effect on the first floor. But the ignition temperature in the three to six floor higher than about 10℃ when ignition temperature in the first floor. The smoke layer visibility, smoke layer height in the three to six floor as same as the smoke layer visibility, smoke layer height in the first floor. Fire source at the top level, the serious consequences brought about by the fire basically not bring much impact on the 1-5 floor.(4) In the use of non-induced ventilation duct underground garage, the height of the smoke layer began to fall, it will rise rapidly after a short time. Without the use of mechanical ventilation in the underground garage, smoke layer height will gradually decline over time. In the 170 s after the smoke layer height has been less than 1m, affected personnel to escape.This study for fire smoke spread in the office building, it is a certain significance for the safety of personnel escape. Similar guidance rationalization can provided for fire prevention measures about office building in the furture. It also provide some help Fire simulation training.