摘要  继文献[1]对L形截面钢柱的弯扭相关屈曲一般性方程研究，本文研究了L形截面钢柱轴心受压承载力实用计算方法，推导出了L形截面柱换算长细比计算公式，考虑了柱缺陷影响，给出了轴心受压稳定系数 ，从而得出L形截面柱轴心受压实用设计计算公式，并做了几组L形截面柱轴心受压承载力试验，验证了计算公式。

关键词  L形截面钢异形柱，柱初始缺陷分析，换算长细比，轴心受压

Research on the Applied Calculation method

for Steel Abnormity-section Columns under Axial Pressure

Wang minggui¹  Wang xiaoyu²  Chen zhanghua²

(1 China Academy of Building Research  Beijing 100013)

(2 Science and Technology University of Beijing  100083)

 [Abstract] Following the literature [1] about the general equations of torsional-flexural interactive buckling, this paper has been researched on the calculation method of load-carrying capacity to the L-section column under axial pressure for engineering applications. The equivalent slenderness ratio of L-section column has been derived. Considering the influence initial imperfections, the column’s steady coefficient  is obtained under axial pressure. Thereby we have gained the applied calculation formula about L-section column under axial pressure. Eventually we have finished several groups of experiments about bearing capacity of L-section column under axial pressure so as to testify the computing formula.

[Keywords] L-section steel column, analysis of initial imperfections column, equivalent slenderness ratio, axial pressure

我们在文献[1]中提出了钢异形柱在住宅建筑中应用的思想，并利用薄壁构件理论建立了L形截面柱弯扭相关屈曲一般性方程，分析了理想直杆轴压特征值问题。本文将进一步研究L形截面柱轴心受压承载力实用设计计算公式，首先推导出L形截面柱换算长细比计算公式，再引入柱缺陷影响，给出了轴心受压稳定系数，从而得出L形截面柱轴心受压实用设计计算公式，再用试验进行验证所得计算公式。

1      引述

为了方便叙述，在此引进文献[1]有关任意截面柱弯扭屈曲相关方程：

         (1)

弯矩可以写成： ， ，其中偏心距 和 都是以主轴的正方向为正，负方向为负，这样，方程（1）就可以写为：(2)

式中

 为材料屈服强度，E为材料弹性模量，G为材料剪切模量，l为构件长度，A为构件截面面积，（x₀，y₀）为截面剪坐标。如图1所示， o z为形心主坐标系，o为形心。

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