Study On Safety Of Fire Evacuation During The Exterior Wall Decoration Of Shopping Mall

With the rapid development of social economy,in order to maintain a good urban style,the exterior facades of buildings along the street need to be renovated every other period of time.The renovation time is generally about half a year.In order to reduce economic losses,most shopping malls operate normally during the decoration of the external wall,which increases the probability of fire accidents caused by illegal operation of the external wall construction and unsafe electricity consumption.Once a fire occurs,the internal combustibles will be ignited,which will also pose a great threat to the escape of people inside the shopping mall.In order to effectively reduce the hazards of fire on people’s lives and property and ensure that more people can escape safely,it is necessary to study the safety of fire evacuation during the decoration of the exterior walls of shopping malls,identify the hidden dangerous parts affecting safety in advance when fire occurs,and provide basis for fire prevention and emergency rescue work of managers of shopping malls.Based on the identification of fire hazards during the decoration of the exterior walls of shopping malls,this paper summarizes the characteristics of fire and evacuation during the decoration of the exterior walls of shopping malls,anda fuzzy evaluation model based on structural entropy weight method is established to analyze fire risk.Using PyroSim software,a fire analysis model is established based on the fire situation during the decoration of the exterior wall of the shopping mall,and a special fire scene is set up because the exterior wall thermal insulation materials ignite the combustibles inside and outside the shopping mall at the same time.According to the simulation results,the relevant characteristic parameters,such as smoke spread,temperature,CO concentration and visibility,are analyzed,and the fire products are combined.The critical condition of hazards to human body is obtained,and the available safe evacuation time(ASET)of people at all levels of the shopping mall in this scenario is obtained.At the same time,according to the evacuation situation of people in shopping malls,the corresponding evacuation model is constructed by using Pathfinder.The movement process of evacuation is simulated and analyzed,and the required safe evacuation time(RSET)of people at all levels of shopping malls is obtained.According to the criteria of safe evacuation,the safety of evacuation in this fire scene is determined by comparing the available safe evacuation time(ASET)and the required safe evacuation time(RSET).Based on the results of the judgment and the relevant evacuation theory,some suggestions are put forward for the fire prevention during the decoration of the exterior walls of shopping malls.