Analysis on influence of personal density on evacuation time in building fire

In the large building where a lot of people get together,once a fire occurs,if people can escape from the building in the safety evacuation time is always an important topic of the emergency study.Taking an underground commercial street as example a human evacuation model was applied to calculate and analysis evacuation time in theory.By analyzing the influence of personal density on evacuation time during the period of building fire,it was determinzed reasonably that the critical personnel density value of the underground commercial street is 0.7 people per square meter.The research results have important significance to introduce the evacuation design in large building.