Underground commercial streets have been developing rapidly, introducing many potential safety hazards threatening people’s safety and causing enormous economic losses.ĭue to the complex structure, closed space, narrow and long streets, much electrical equipment and floating personnel, and many dense materials, there has been a high risk of fire in the underground commercial streets. To alleviate the economic pressure brought by limited land resources, underground commercial streets have developed rapidly. In recent years, the economic construction work all over China has shown a vigorous and upward development trend, which has led to the rapid reduction in available land resources and cost increase of the ordinary business model. Finally, the safety of the building is evaluated, and fire prevention countermeasures are defined based on the actual situation and fire numerical simulation results to reduce fire incidence, casualties, and economic losses. We found that the time when the flue gas temperature and CO concentration reached the critical value in the fire site was longer than the time when the visibility reached the critical value reducing or even avoiding the spread of smoke from the fire area to the evacuation stairs can provide effective help for crowd evacuation. The available safe evacuation time is calculated according to the critical fire hazard judgment conditions. Fire simulation scenarios are divided according to different fire zones by analyzing the temperature, carbon monoxide (CO) concentration, and visibility in the smoke layer inside a building. In this study, while aiming at the prevention of fire accidents in underground commercial streets, an underground commercial street is selected as a research object, and the building fire is numerically simulated using the PyroSim software.
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