本文在梁的整体屈曲分析中,废除了传统的刚性截面假定(刚周边假定),允许梁截面自由地歪曲,进而研究了薄壁截面梁的歪曲屈曲性能。分析中采用了样条有限条法,考虑了各种不同的荷载形式、支承条件和边界约束。这一方法与有限元法相比较,计算工作量大大地减少。数值计算结果表明,在梁长细比的较大范围内,歪曲屈曲模型对梁的设计起控制作用。 In the analysis of the beam’s overall buckling, this paper abolished the traditional rigid section assumption (rigid assumption), allowed the beam section to distort freely, and then studied the flexural buckling performance of the thin-section section beam. The spline finite strip method was used in the analysis, considering various different load forms, supporting conditions and boundary constraints. Comparing this method with the finite element method, the computational workload is greatly reduced. The numerical calculation results show that the flexural buckling model plays a role in the design of the beam in the larger range of beam length to thinness ratio.