Study On FDS Based Air Supplement System Of Underground Garage And Optimization Of Smoke Control Zone

Underground garage fires are not a single solid material fire or liquid fire.The types of combustible materials are more complicated.In addition,underground garage fires have the characteristics of difficulty in heat dissipation,large smoke,high temperature,and flammability and explosion.They provide personnel evacuation and fire rescue.Bring a lot of inconvenience.Therefore,it is necessary to optimize the smoke exhaust system of the underground garage and obtain a more reasonable and effective smoke exhaust system installation,which is of great significance to the fire rescue of the underground garage and the protection of the safety of people’s lives and property.This article summarizes the current research results of underground garage fires and analyzes the underground garage anti-emissions in the"Building Smoke and Smoke Exhaust System Technical Standards"GB51251-2017 and the"Code for Fire Protection Design of Garages,Garages,and Parking Lots"GB50067-2014.For the shortcomings and differences of the smoke system design,the maximum area of the underground garage supplementary air system and smoke prevention zone is studied.The main research contents and conclusions of the paper are as follows:(1)Use FDS fire simulation software to build a model of the example underground garage,set different simulated working conditions according to the requirements of the existing specifications for the supplementary air speed and the amount of supplementary air,study the supplementary air system of the underground garage,and obtain the supplementary air of the underground garage The wind speed should be set at 8～9m/s,and the supplementary air volume should be set to 70%of the smoke exhaust volume,which provides the best effect for the design of the underground garage supplementary air system.(2)Comprehensively consider the randomness of the fire source position when the underground garage fire occurs,set three different fire source positions:central fire source,short-side wall fire source,and long-side wall fire source,and study the relative position of the air inlet to the fire separately The influence of the smoke spread and temperature field in the underground garage at the time of occurrence,it is obtained that when the fire source occurs at different positions,the effect of symmetrical supplementary air on the long side is better than that on the short side,the same side of the long side and the asymmetrical supplementary air.Obtain the optimal opening method of multiple air supply openings in the underground garage,and realize the linkage through the Python program to provide technical reference for the location of the air supply openings in the underground garage.(3)To study the difference between the maximum allowable area of smoke prevention zone in the two codes,on the basis of the same fire source position,study the smoke when the smoke prevention zone area is 500 m~2,1000 m~2,1250 m~2,2000 m~2 Spread and temperature change,it is more reasonable to divide the maximum allowable area of the smoke prevention zone according to the requirements of the"Building Smoke and Smoke Exhaust System Technical Standards"not exceeding 1000m~2,and it is more conducive to set the evacuation port in different smoke prevention zones Personnel evacuation and rescue.