Abstract: This paper makes an analysis for the correlation of two-end deformational additions of elastic-plastic steel beam-columns when axial load is changed,establishes interaction equations of two-end deformational additions of beam-columns with additions of transverse loads and axial loads,and makes it possible for the inverse calculation segment length method to be used to calculate the ultimate strengths of frames.

Key words: steel beam-column, correlation equation, the inverse calculation segment length method, ultimate strength

摘要： 本文在文[2]的基础上,继续讨论了弹塑性梁-柱当轴向压力N发生改变时杆端变形增量的相关关系。文中导出了轴力增量ΔN引起的杆端变形的增量关系式,与文[2]巳建立的杆端变形增量相关方程合并,得到了弹塑性梁-柱在纵向力系、横向力系同时改变时两杆端变形增量与纵、横力系增量的相互关系式,从而使框架结构的计算能以每根梁-柱为独立单元,按逆算单元法计算出结构的承载能力。

关键词: 钢梁-柱, 相关方程, 逆算单元长度法, 极限承载能力