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利用经实验验证过的ABAQUS有限元模型对轴力和弯矩共同作用下的约束钢柱进行了参数分析。以钢柱的屈曲温度和临界温度作为主要的评价指标,主要考虑了轴力荷载比、弯矩荷载比、轴向约束刚度比、转动约束刚度比、长细比和钢柱端部弯矩比等参数的影响,并且对不同参数之间的耦合性进行了分析。参数分析结果表明,轴向约束刚度的增大将会明显降低约束钢柱的屈曲温度,但是对其临界温度的影响相对较小;端部弯矩比对钢柱的临界温度影响很小;当钢柱的轴力荷载比和弯矩荷载比较小、轴向约束刚度比和长细比较大时,考虑屈曲后性能可以显著提高钢柱的抗火能力。
The constrained steel columns subjected to axial force and bending moment were analyzed by ABAQUS finite element model. Taking the buckling temperature and critical temperature of steel columns as the main evaluation indexes, the axial load ratio, bending moment load ratio, axial restraint stiffness ratio, rotational restraint stiffness ratio, slenderness ratio and moment ratio And other parameters of the impact, and the coupling between the different parameters were analyzed. The results of parameter analysis show that the increase of axial restraint stiffness will significantly reduce the buckling temperature of the constrained steel column, but the influence on the critical temperature is relatively small. The end moment ratio has little effect on the critical temperature of the steel column. When the axial load ratio and moment load of the column are relatively small, and the axial restraint stiffness ratio and the slenderness ratio are relatively large, the post-buckling performance can significantly improve the fire resistance of the steel column.