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为判定人员疏散过程中“准安全区”的安全性,采用基于性能化防火设计的方法对建筑“准安全区”的安全性进行判定。“准安全区”内烟气热辐射、烟气能见度及有毒气体等有害因素的指标必须达到“准安全区”规定的指标要求。发生火灾时,“准安全区”内距离地面2 m以下烟气层温度不应超过60℃,烟气层能见度不应小于10 m,烟气层CO浓度不应大于5×10-4mol/mol。工程应用中可根据“准安全区”各性能判定标准,通过火灾模拟软件模拟分析火灾场景下“准安全区”内各有害因素的性能参数分布,对“准安全区”的安全性进行定性、定量评估。
In order to determine the safety of “quasi-safe zone” during the evacuation of personnel, the method of performance-based fire protection design is adopted to determine the safety of the building’s “quasi-safe zone”. “Quasi-safe area ” in the flue gas heat radiation, flue gas visibility and toxic gases and other harmful indicators of indicators must be “quasi-safe area ” the requirements of the index. In the event of a fire, the temperature of the flue gas layer below 2 m from the “quasi-safe zone” shall not exceed 60 ° C, the visibility of the flue gas layer shall not be less than 10 m, and the CO concentration of the flue gas layer should not exceed 5 × 10 -4 mol / mol. In engineering application, the distribution of performance parameters of various harmful factors in the “quasi-safe zone” under fire scenario can be simulated and simulated by fire simulation software according to the criteria of “” quasi-safe zone " The safety of qualitative, quantitative assessment.