Study On Smoke Spread Law And Control In Flat Large Space Building Fire

With the development of economy, many new requirements on the use function of the building were proposed, result in producing a kind with more special geometric features buildings. They have a large building area and not high height, so they are called the flat large space buildings. Fire smoke is the most important factor of causing casualties in a fire, the fire safety of the building dependents on the control and management of fire smoke. In this paper, the topic research is that the migration law of fire smoke on flat large space buildings is studied, under the set condition of different fire location, fire power, and smoke control systems, with dynamic fire simulation software FDS, to strive for the provide guidance on smoke control system design, modification and fire personnel safety evacuation of the flat large space buildings.In this paper, firstly, the fire and smoke, smoke control methods and fire particularity of the flat large space buildings are introduced. Fire protection problems of the flat large space buildings mainly concentrating in the following aspects:larger fire partition area; longer evacuation distance; not enough evacuation width. Due to low floor headroom, the personnel are subjected to the threat of fire smoke.Secondly, numerical simulation theory and method of the flat large space buildings are summarized, in the modeling of fire, combined with the actual situation of our school library, in this paper the fast-square stable fire is taken. By comparing four kinds of simulation methods, and the field simulation ultimately is determined in this paper. And adopted FDS simulation software is also introduced.Finally, numerical analysis of flat large space buildings is carried with FDS simulation sollware, as an example of our school library stacks, four fire scenes are built, and fire smoke spread law is analyzed under the comparative condition of three kinds of natural smoke extraction including the original conditions, changing fire location, fire power, and mechanical smoke extraction. It is concluded that the fire smoke spread path and extent have been changed due to the fire source position; the impact of the spread of the smoke and fire parameters are weakened with reduction of the fire power; the visibility, temperature, and CO concentration of the fire are all reduced with reasonable arrangement of mechanical smoke extraction, they are more favorable to personnel escape。...