季  渊    童根树    （浙江大学土木系  杭州 310027）

[提要]  有吊车厂房中框架柱轴力和截面都旱阶形变化，对柱脚铰接的阶形柱的计算长度规范没有规定。通过对柱脚铰接的阶形柱的弹性屈曲分析，得到了框架柱平面内、平面外计算长度系数的表达式和计算表格，结果与有限元分析符合得很好。在此基础上，对计算长度系数公式进行了简化，结果对于工程设计人员进行框架柱的稳定性设计具有重要的指导意义。
[关键词]  门式刚架  稳定性  计算长度  系数  轻钢结构  阶形柱

Because of the crane loads, columns in portal frames are stepped. The effective length of the stepped columns is not available either from the specifications or from the literature, when the column base is hinged. This paper analysed the buckling of hinged portal frame with crane loads. Formulas and tables of the effective length factors for the base-hinged column both in plane and out of plane are proposed. The results are in good agreement with exact solutions.
Keywords: gabled frame; stability; effective length; factor; light section steel structure