某体育场钢结构耐火安全性评价

Fire resistance evaluation of steel structure in a stadium

某大型体育场共设计五个防火分区。以FDS模拟火灾,设定场景A西侧看台高位座椅火灾和场景B六层直播评论室办公室火灾,火灾规模分别取2MW和1.5MW,延续时间30min。场景A钢屋架温度低于200℃,可不做防火保护。场景B若无水喷淋保护则较低位置钢网架最高温度可达700～800℃,钢结构不安全;若有喷淋保护则钢结构表面温度低于200℃,钢结构可不做防火保护.建议各功能区设置喷水灭火系统。

There are 5 fire compartments in a stadium.The fire in stadium was simulated by FDS.Scene A was chair on west stand catch fire and scene B was living broadcast office catch fire,and the fire were 2 MW and 1.5 MW,last 30 min.The temperature of steel structure was lower than 200 ℃ and the steel structure may have no fire resistance protection.The temperature of steel structure in scene B if there was no sprinkler is between 700 ℃ and 800 ℃,the steel structure is not safe.The temperature of steel structure in scene B under the protection of sprinkler is lower than 200 ℃ and the steel may have no fire resistance protection.Water sprinkler was suggested to set in each section.