饶芝英
    （浙江大学土木系  杭州 310027）

[提要]  比较了梁柱轴线取法不同对内力分析结果的影响，对门式刚架稳定性计算的各有关问题进行了详细的计算分析，提出了简化计算公式，可供设计人员参考。对内力分析采用一阶和二阶方法产生的差别也进行了讨论。
[关键词]  门式刚架 稳定性 楔形杆件

The effect on the internal forces when different line modes are used for the porter frames with tapered
members is studied. Detailed procedure is presented to determine the effective length of tapered columns in the frames. Comparison is carried out to know the second order effect in porter frames.
Keywords:  porter frame; stability; tapered member; second order effect