How to escape from a fire in a high-rise building?
Other experiments have shown that the use of new materials reduces the fire resistance of wall linings, windows and interior doors, and may also accelerate the spread of fire. The combination of these changes may accelerate the evolution of the fire development stage and increase the probability of the fire entering the ventilation control or anoxic combustion state before the firefighters arrive. There are two key issues related to the ventilation limited fire: first, it is more difficult to determine the specific location of the fire from the outside of the building, which is usually the first issue for disaster relief commanders. 2、 The traditional ventilation strategy may provide oxygen for combustion and make the fire worse. In order to plan a safer and more efficient ventilation strategy, it is necessary to have an in-depth understanding of the flow path. Flow path refers to the space for the diffusion of flame, heat and smoke, so that they can move from the entrance and high-pressure fire to the exit area rich in low-pressure oxygen sources, such as door and window openings.
The significance of cutting off the flow path: today's building fires are very different from those faced by previous generations of firefighters in many aspects. Firefighters face more risk factors and greater risks. Due to the changes of modern fire environment, the traditional fire fighting and rescue methods are sometimes not the most safe and effective. In a burning building structure, cutting off the flow path - interrupting the flow of flame inside the burning building - is an innovative tactical strategy, sometimes even different from the usual experience. But our research shows that these methods can reduce the heat inside the building, minimize the probability of a boom, and greatly improve the survival rate of residents and firefighters.
In the past few years, the United States has reported a building fire every 66 seconds, injuring 1.7 residents per hour. Since the late 1970s, the casualty rate of firefighters working inside buildings has increased by 67%. Although the overall fire mortality rate in the United States has decreased by 64% in the past three decades, it is clear that modern building fires pose great danger to both firefighters and occupants. During this period, the continuous change of residential fire environment plays a key role in the aggravation of building fire.