本文讨论了梁在轴力/弯矩组合变形下的安定性分析.文中用 Melan 定理和Koiter 定理分别算出安定极限的上限值与下限值,经进一步分析给出了安定极限的完全解。为便于工程应用,最后将此解简化为安全可靠的线性近似公式. In this paper, the stability analysis of beam under the combination of axial force and bending moment is discussed.The upper limit and the lower limit of stability limit are respectively calculated by Melan’s theorem and Koiter’s theorem, and the complete solution of stability limit is given by further analysis. For the convenience of engineering application, this solution is finally reduced to a safe and reliable linear approximation formula.