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本文利用有限元方法对门式刚架进行弹性稳定性分析。算例表明，这种方法在杆系结构的稳定分析中是有效可行的，具有计算简洁，便于计算机处理和很好的工程应用价值。
In this paper, the elastic stability of portal frame is analyzed by finite element method. The example shows that this method is effective and feasible in the stability analysis of the bar structure with the advantages of simple calculation, convenient computer processing and good engineering application value.