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利用验证的有限元模型分析了轴向约束刚度比、轴力荷载比和钢柱长细比对火灾下轴心受压H形截面约束钢柱屈曲温度和破坏温度的影响,给出了其屈曲温度和破坏温度的计算方法。轴向约束刚度比对约束钢柱屈曲温度和破坏温度的影响可用指数函数表示,轴力荷载比和钢柱长细比对约束钢柱屈曲温度和破坏温度的影响可用多项式表示。采用有限元方法对计算公式进行了验证,设计公式计算结果与有限元分析结果吻合较好,且设计公式给出偏于安全的结果。
The effects of axial restraint stiffness ratio, axial load ratio and slenderness ratio of steel columns on the buckling temperature and failure temperature of confined steel columns under axisymmetric H-section under fire were analyzed with the finite element model verified. The buckling Calculation of temperature and destruction temperature. The influence of axial restraint stiffness ratio on the buckling temperature and failure temperature of confined steel columns can be expressed by an exponential function. The influence of axial load ratio and slenderness ratio on the buckling temperature and failure temperature of confined steel columns can be expressed by polynomial. The finite element method is used to verify the calculation formula. The calculation results of the design formula are in good agreement with the finite element analysis results, and the design formula gives the result of partial safety.