Simulation study on influence of fire smoke flow on evacuation in high-rise buildings

doi:10.16265/j.cnki.issn 1003-3033.2020.12.017

Abstract

Abstract: There exist ceiling jet and chimney benefit phenomenon in high-rise buildings in case of a fire, which cause adverse effects on evacuation. In order to further explore influence of fire smoke flow on safe evacuation, a geometric model of floors and stairs was established with a 21-storey building in Lu'an city as research object, and high-rise buildings were numerically simulated by using fire dynamics simulation (FDS) software. Changes of smoke flow characteristics and relevant parameters were studied, and influence of fire smoke spread on safe evacuation was obtained. The simulation results show that temperature of flue gas has a greater impact on evacuation than light attenuation. Flue gas flow speed is directly related to HRR of fire source. Evacuation time will be sufficient when HRR is small, and proper control of it can ensure more time for evacuation. And it is more helpful to improve evacuation efficiency by setting up fire elevator in higher floor of buildings.

Key words: fire in high-rise building, smoke flow, numerical simulation, evacuation, heat release rate (HRR)

CLC Number:

X932

DING Houcheng, XU Yuandi, DENG Quanlong, LIAN Zhixu. Simulation study on influence of fire smoke flow on evacuation in high-rise buildings[J]. China Safety Science Journal, 2020, 30(12): 118-124.

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