兩板件截面均勻受壓柱的柱子曲線
李開禧 溫伏明 趙廣坡
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(重慶大學(xué)土木工程學(xué)院 400045)
[提要] 按照空間失穩(wěn)的概念，算出L，T形截面軸壓柱的最小臨界力與相應(yīng)屈曲模態(tài)，并確定具有初彎曲、初扭轉(zhuǎn)柱的二階應(yīng)力分布狀態(tài)；再根據(jù)邊緣屈服準(zhǔn)則，反算出柱的極限荷載并繪制出柱子曲線。計(jì)算結(jié)果表明短柱有可能扭轉(zhuǎn)失穩(wěn)，需要作進(jìn)4步的分析驗(yàn)算；細(xì)長柱只發(fā)生面內(nèi)彎曲失穩(wěn)，可以不進(jìn)行修正。[關(guān)鍵詞]均勻受壓柱 空間穩(wěn)定 屈曲模態(tài) 柱子曲線Abstract：Based on the concept of spatial stability, the minimum critical forces and buckling models corresponding to the axially-compressed columns with L-section and T-section are calculated; and for the columns with initial bending and torsion, the second stress distributions are determined. In addition, the limit loads of the columns are computed and the column curves are plotted in terms of outmost fiber yielded criteria. The results indicate that the stub columns probably lose stability due to torsion, and a further analysis on the stub columns need to be carried out, but slender columns become instable only by the bending in the plane and column curves needn't to be modified.Keywords: axial uniformly compressed column; spatial stability; buckling mode; column curve
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