Elastic buckling of stiffened steel plate walls (S-SPWs) under combined compression and shear was studied focusing on the stiffness demand on stiffeners to implement subpanel’s buckling mode. Flat-bars and closed form stiffeners were considered. Threshold stiffness of stiffeners is presented for elastic buckling of subpanels of S-SPWs in pure compression, pure shear and combined compression and shear. The effect of stiffeners’ torsional stiffness has been included.

Then the elastic–plastic (E-P) buckling of S-SPWs under combined compression and shear was studied. A criteria was established to identify the E-P shear buckling stress under a prescribed compression stress for S-SPWs with given stiffness of stiffeners. Threshold stiffness of stiffeners was taken on the buckling stress – stiffness curve at the transition point as the E-P buckling shear stress reaches a plateau. The demand of keeping stiffeners straight when stiffeners are compressed simultaneously has been incorporated in such defined threshold stiffness. Equations for threshold stiffness of flat-bars and closed form stiffeners are proposed separately and comparisons with finite element results show good accuracy.

研究了加筋钢板壁（S-SPW）在组合压缩和剪切作用下的弹性屈曲，着眼于对加劲肋的刚度要求，以实现子面板的屈曲模式。考虑了扁钢和封闭式加劲肋。提出了在纯压缩，纯剪切以及组合压缩和剪切作用下，S-SPW子面板的弹性屈曲的加劲肋的阈值刚度。包括了加劲肋的扭转刚度的影响。

然后研究了组合压缩和剪切作用下S-SPW的弹塑性（EP）屈曲。建立了一个标准，以在给定的加强筋刚度的情况下，在规定的压缩应力下识别S-SPW的EP剪切屈曲应力。加强筋的阈值刚度取于屈曲应力–当EP屈曲剪切应力达到平稳状态时的过渡点处的刚度曲线。在同时限定加劲肋时保持加劲肋笔直的要求已包含在这样定义的阈值刚度中。分别提出了扁钢和封闭式加劲肋的阈值刚度方程，并且与有限元结果的比较显示出良好的精度。