- 摘 要
-
李 剛 （大連理工大學(xué)工程力學(xué)研究所 116023）周仁根 （太原工業(yè)大學(xué)土木系 030024）
[提要] 簡要討論了目前框架結(jié)構(gòu)整體穩(wěn)定分析的一些方法及特點，提出了一種新方法——等效軸力法，該法以壓彎構(gòu)件在彈性階段的邊緣屈服準(zhǔn)則為理論基礎(chǔ)，通過分析一階內(nèi)力、計算等效軸力和利用理想框架的分枝穩(wěn)定理論，簡便而有效地處理了考慮軸向力、側(cè)向力、彎矩、P-△效應(yīng)、初彎曲及初偏心等各種因素的框架整體穩(wěn)定問題。算例表明，等效軸力法是合理有效的。
[關(guān)鍵詞] 等效軸力 一階理論 二階理論 框架結(jié)構(gòu) 穩(wěn)定性The present theories and methods for global stability analysis of frames are summarized and a new method called equivalent axial force is presented. Based on the cross - section edge yield critia of compressing - bending member in elastic stage, it can handle the global stability of frames under the action of axial loads, lateral loads, bending moments, P -△effect and initial flexure etc by the steps of first - order analysis of the frame, the caculation of equival axial force and stability of the ideal frame. Numerical results show that this method is rational and effective.
Keywords: equivalent axial force; first - order theory; second - order theory; frame stability
