机场航站楼钢结构防火保护范围研究

The fire protection scope of steel structure in airport terminal

调研国内外规范及实际工程钢结构防火保护情况。以某机场航站楼大空间建筑为例,通过CFD计算火灾时屋顶钢结构温度,建议对8m高度以下的钢结构柱进行防火保护,耐火极限不应小于2.50h,8m以上高度可不进行防火保护。并用数值模拟分析钢结构力学性能,用经验公式计算火羽流温度,对该建议进行验证。

Standards and the steel structure protection in practi- cal projects were investigated. Taking an air terminal, which is a large space building, as an example, the steel structure tem- perature on the ceiling during the fire development was calculat- ed by CFD, and suggestion was given that there should be fire protection of more than 2.5 h for steel column below 8 m, and the fire protection can be skipped above 8 m. In order to verify the conclusion, mathematical simulation was conducted to ana- lyze the mechanical properties of steel structure, and empirical formulas were used to calculate the fire plume flow tempera- ture.