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利用有限元方法,对薄壁异形截面铝合金轴心受压柱在火灾不同温度下的破坏模态和屈曲承载力进行了研究。有限元模型通过试验进行验证,并采用稳态分析的方法考虑火灾高温的影响。研究了火灾高温对该类截面柱破坏模态的影响,证实火灾高温会降低柱的屈曲承载力,但不会改变柱的破坏模态。利用有限元方法分析了不同长细比的铝合金柱在不同温度下的屈曲承载力,并将有限元结果与根据欧洲规范EN1999-1-2的计算结果进行对比。结果表明,该规范的设计方法不能准确计算薄壁异形截面铝合金轴压柱的抗火承载力。在有限元分析的基础上提出了针对薄壁异形截面柱高温下承载力的修正公式。
Using the finite element method, the failure mode and the buckling bearing capacity of thin-walled profiled aluminum alloy axial compression columns at different temperatures were studied. The finite element model is verified by experiments and the influence of high temperature in fire is considered by means of steady state analysis. The effect of high temperature in fire on the failure modes of the cross-section columns was studied. It was confirmed that the high temperature in the fire would reduce the buckling capacity of the columns, but would not change the failure modes of the columns. The flexural capacity of aluminum alloy columns with different slenderness ratios at different temperatures was analyzed by using the finite element method. The results of finite element analysis were compared with the results according to the European standard EN1999-1-2. The results show that the design method of this code can not accurately calculate the fireproof bearing capacity of thin-walled profiled aluminum alloy axial columns. Based on the finite element analysis, a modified formula for bearing capacity of thin-walled profiled section columns at high temperature is proposed.