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本文用等效弹性支座法精确导出了起重机吊臂在非保向力作用下的通用屈曲方程，给出了确定临界力及计算长度的算式，计算简单、结果准确、便于应用。
In this paper, the general buckling equation of crane boom with non-retaining force is deduced accurately by the equivalent elastic support method. The formula to determine the critical force and calculation length is given. The calculation is simple, the result is accurate and easy to apply.