饶芝英  童根树
    （浙江大学土木系 杭州 310027）

[提要]  对楔形变截面轴压杆在各种边界条件（包括弹性约束）下的稳定性进行了详细研究，提出了简单而精度较高的计算式；对门架有侧移失稳时变截面梁对柱子提供的转动约束进行了分析，提出了高精度的近似计算式，可直接用于计算变截面门式剐架的计算长度或临界荷载。
[关键词]  门式刚架 稳定性 楔形杆件 临界荷载 计算长度 边界条件

The stability of tapered member of variable cross-section under axial pressure loads in every boundary
condition is researched, and a simple mathematical formula with high precision is given. Then the rotative restraint of column supported by non-uniform beam when portal frame loses stability with lateral displacement is analyzed, and a mathematical formula with high precision is obtained which can calculatethe calculating length or critical load of portal frame.
Keywords:  portal frame; stability; tapered member; criticalload; calculating length; boundary condition