本文参考两种理论的能量方程，推导了梭形变截面工字形简支钢梁的临界弯矩公式。
In this paper, a formulation of critical moment of tapered simply-supported I-beams is obtained on the foundation of each theory.
此外，本文提出了在弯矩载荷作用下，U形波纹管膨胀节失稳临界弯矩的初步计算公式。
A primary formula to calculate the buckling critical load is put forward, when U-shaped bellows only subjected to bending, and will be discussed for the future.
提出了新的变截面梁临界弯矩计算式，其表达形式与等截面梁的公式相同，便于工程应用。
A new critical moment formula of tapered beam is proposed, which is similar to the expression for beams with uniform cross-section.
根据有限元分析的结果，将临界荷载转换为临界弯矩，求出了梭形变截面工字形简支钢梁的变截面系数。
According to the results of finite element analysis, the critical load has converted to the critical moment, and the tapered coefficient of tapered simply-supported I-beams has been calculated too.
就国内现有的薄壁钢梁弯扭失稳理论进行了分析，从薄壁杆件的一般理论出发，推导出荷载过截面弯心并与主轴平行的受弯钢梁的临界弯矩公式。
On the base of the general theory of thin-walled members, we deduce a new critical moment formula of steel beam under transverse loads which pass the shear center and parallel to the main axis.
就国内现有的薄壁钢梁弯扭失稳理论进行了分析，从薄壁杆件的一般理论出发，推导出荷载过截面弯心并与主轴平行的受弯钢梁的临界弯矩公式。
On the base of the general theory of thin-walled members, we deduce a new critical moment formula of steel beam under transverse loads which pass the shear center and parallel to the main axis.
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