Abstract: According to the concept of critical bimoment,this paper proves two independent critical forces that affect the bearing capacity of a steel beam.The procedure is illustrated by several numerical examples.Corresponding to the numerical results of three load conditions,a practical interaction equation is proposed for evaluating the critical moment of steel beams.

Key words: critical bimoment, critical forces, interaction equation, equivalent mo-ment factor

摘要： 本文在临界双力矩概念^[1]的基础上,论证影响钢梁承载能力的两个独立临界力因素,以全面计算数据为前提,分析两临界力因素的相互作用关系,进而提出计算临界弯矩的实用相关方程。

关键词: 临界双力矩, 临界力因素, 相关方程, 等效弯矩系数