纯压或纯弯薄壁杆件的稳定分析

根据位移变分原理，本文提出一种纯压或纯弯薄壁杆件稳定分析的新单元。稳定分析考虑了壁中面上剪应变的影响，能很好地描述剪力滞后现象，采用线性函数作为横截面翘曲位移的插值函数。本方法适用于任意横截面形状和任意边界条件的薄壁杆件。数值算例的结果表明本方法灵活、精确和有效。

Buckling of Thin-Walled Members under Pure Compression and Pure Bending with Shear Effect

Based on the displacement variational principle, a new element is developed for buckling analysis of thin-walled members with shear lag effect in the present paper. A linear function is used to simulate the warping displacements along the cross section of the thin-walled member. The proposed method is applicable for the thin-walled member of any cross section with any boundary condition. Compared with the result from classical theory, the versatility, accuracy and efficiency of the proposed method are fully demonstrated.