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给出了确定轴压约束钢柱在火灾升温条件下屈曲温度和破坏温度的简化计算方法,采用有限元方法、相关研究者的研究成果和试验结果对计算方法进行了验证。约束钢柱屈曲前,随着温度升高,轴力线性增加,截面弯矩很小并保持不变,采用无约束钢柱屈曲温度计算公式确定其屈曲温度,钢柱轴力考虑轴向约束的影响;约束钢柱屈曲后处于轴力和弯矩的共同作用下,利用截面屈服条件表示的轴力-弯矩相关关系确定其破坏温度,钢柱轴力取升温前初始轴力。本文方法计算结果与有限元分析结果和其他研究人员的研究成果吻合较好,与试验结果的比较表明本文方法偏于安全。
The simplified calculation method for determining the buckling temperature and failure temperature of axially constrained steel columns subjected to fire is given. The calculation method is verified by the finite element method and the related researchers’ research results and experimental results. Before the buckling of the confined steel columns, the axial force increases linearly with the increase of temperature, and the moment of section is small and remains unchanged. The buckling temperature of unconstrained steel columns is used to determine the buckling temperature. Under the combined action of axial force and bending moment, the failure temperature of the steel column is determined by the relationship between the axial force and the bending moment indicated by the section yield condition. The axial force of the steel column is taken as the initial axial force before the temperature rise. The calculation results of this method are in good agreement with the results of finite element analysis and the research results of other researchers. The comparison with the experimental results shows that this method is biased towards safety.