Research On Fire Evacuation Of High-rise Buildings Based On FDS And Personnel Positioning System

With the growth of the national economy and the rapid development of science and technology,all kinds of high-rise buildings are lined up.However,while the highrise buildings provide us with great convenience,there are also some problems.In the event of a fire in a high-rise building,it's very difficult for people to evacuate because of the long vertical distance and the density of people.Therefore,it is an urgent problem to be solved that study how to complete personnel evacuation safely and quickly of high-rise buildings in the fire situation.First of all,in this paper,using a 23 rd floor office building in WuHu for the example and setting up numerical model with FDS simulation software to set up two models to simulate and analyze what is the floor part and stair part respectively.To get personnel available safe egress time(ASET)and provide the basis for personnel evacuation,this article focuses on smoke movement characteristics,concentration variation of CO,CO2,O2 and distribution of temperature field when a fire breaks out in office building.Secondly,use ZigBee technology to get personnel location which is the indoor personnel positioning technology.According to smoke movement characteristics and temperature distribution in fire,arranging the gateway and other equipments in ZigBee technology properly.Combined with CAN bus technology to build the indoor personnel positioning system,the three-dimensional coordinates of the personnel in the office building are obtained,which facilitates the evacuation of the guidance personnel;Finally,the Pathfinder software was used to establish the model and analyze the evacuation situation of the personnel in the office,and the required safe egress time(RSET)was obtained,and the conclusion was drawn by comparing with ASET.Results show that one,without guide evacuation cases,1717 s is required for all personnel in office buildings for evacuation;people can escape the corridor within the allowed time,but it is dangerous that a large number of people gather at the stairwell to wait for evacuation.Two,in the guidance of evacuation,1076 s is required for all personnel in office buildings for evacuation;the person can escape the corridor in time and have no crowding,so as to make a safe escape;Three,when using the staircase + elevator for mixed evacuation,the elevator can be used to transport the personnel in the fire floor first.In the evacuation,no more than four(including four)floors will be used for evacuation.The remaining personnel who use the stairs for evacuation should also obey the management personnel arrangement,follow the orderly evacuation,and ensure the safe and efficient evacuation of personnel.