大跨钢结构抗火设计方法

A fire resistance design method of large span steel structures

介绍大跨钢结构构件及整体结构的抗火设计方法。依据工程实例,设定火灾场景,采用数值模拟的方法确定火灾温度场,通过考虑对流和辐射传热确定结构构件的温度。考虑火灾和荷载的组合效应对构件承载能力进行验算,分析整体钢结构的应力、位移变化,得出耐火时间,指导大跨钢结构构件和整体结构的抗火设计。

A fire resistance design method of large span sleel structures is proposed. According to the project casv, hy setting the fire scenarios, the air temperature in a fire was obtained by the m, merical simulation method. Then, the temperature of the steel mem hers was obtained by the radiation and the convection heat transfer between steel members and fire. The effect combination of the loads and the high temperature was considered to catcutate the load capacity of steel members. The change of stress and displacement of the total structure was analyzed and the fire resistance time was ohtained to give advice for the fire resistance design of steel members and total structure of the large span steel structures.