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温度场计算是大空间钢结构抗火性能计算的重要环节,已有的计算方法较为复杂。该文提出了火灾升温阶段不同位置构件温度的比例关系与其相应位置空气温度的比例关系相同的假设,并将这一假设推广至降温阶段,实现了火灾升温和降温阶段结构温度场的简化计算。一个平面网架结构的抗火性能计算表明:简化方法与精确方法的计算结果符合良好,可用于大空间钢结构抗火性能计算。
Calculation of temperature field is an important part of fire resistance calculation of large space steel structure. The existing calculation methods are complicated. In this paper, the hypothesis that the proportional relationship between the temperature of components at different positions and the corresponding position air temperature are the same during the heating stage is proposed. The assumption is generalized to the cooling stage, and the simplified calculation of the temperature field during the heating and cooling phases is achieved. The calculation of fire resistance of a planar grid structure shows that the calculated results of the simplified method and the accurate method are in good agreement and can be used to calculate the fire resistance of large-space steel structures.