Research on mechanism of fire prevention and control of external insulation system based on numerical simulation
In recent years,a number of fires have occurred in the external insulation system of the building,resulting widespread concern about the external insulation system from all spheres.In this study,a new high-rise residential building with EPS external thermal insulation material in Baotou City,Inner Mongolia Autonomous Region is established as the FDS model.To improve the FDS model accuracy,the simulation parameters are optimized by comparing the flame front height-time curves of actual fire and simulated fire.Seven sets of working conditions are set up by using optimized external insulation system,to investigate the influence of combustion performance of external insulation materials,the thickness of fire isolation zone,and the presence of spraying on the fire spread characteristics and the temperature variation.In this study,a new method for studying external insulation fire applied by numerical simulation is exploring.The results showed that comparing the combustion performance of B,and B2 of EPS external insulation materials,the flame front of B2 material spreads horizontally and vertically 400s earlier than that of B,material.The upward spread of fire could be effectively controlled by setting a 300 mm thick fire isolation belt.The peak flame temperature is reduced by 150℃ and the time for the external insulation material to reach the ignition point is slowed down by 50s when the sprinkler system is installed than that without the sprinkler system.By studying the actual fire to optimize the model,the vertical and horizontal fire spread trends of the model are close to the actual fire.This research method could not only quantitatively evaluate the fire risk for the building structure and external insulation characteristics,but also propose the advice of effective fire prevention and control for high-rise external insulation.
external insulation systemfire riskFDSfire prevention and control
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