摘要  繼文獻[1]對L形截面鋼柱的彎扭相關(guān)屈曲一般性方程研究，本文研究了L形截面鋼柱軸心受壓承載力實用計算方法，推導(dǎo)出了L形截面柱換算長細比計算公式，考慮了柱缺陷影響，給出了軸心受壓穩(wěn)定系數(shù) ，從而得出L形截面柱軸心受壓實用設(shè)計計算公式，并做了幾組L形截面柱軸心受壓承載力試驗，驗證了計算公式。

關(guān)鍵詞  L形截面鋼異形柱，柱初始缺陷分析，換算長細比，軸心受壓

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

我們在文獻[1]中提出了鋼異形柱在住宅建筑中應(yīng)用的思想，并利用薄壁構(gòu)件理論建立了L形截面柱彎扭相關(guān)屈曲一般性方程，分析了理想直桿軸壓特征值問題。本文將進一步研究L形截面柱軸心受壓承載力實用設(shè)計計算公式，首先推導(dǎo)出L形截面柱換算長細比計算公式，再引入柱缺陷影響，給出了軸心受壓穩(wěn)定系數(shù)，從而得出L形截面柱軸心受壓實用設(shè)計計算公式，再用試驗進行驗證所得計算公式。

1      引述

為了方便敘述，在此引進文獻[1]有關(guān)任意截面柱彎扭屈曲相關(guān)方程：

         (1)

彎矩可以寫成： ， ，其中偏心距 和 都是以主軸的正方向為正，負方向為負，這樣，方程（1）就可以寫為：(2)

式中

 為材料屈服強度，E為材料彈性模量，G為材料剪切模量，l為構(gòu)件長度，A為構(gòu)件截面面積，（x₀，y₀）為截面剪坐標(biāo)。如圖1所示， o z為形心主坐標(biāo)系，o為形心。

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