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为了研究水压作用下的加肋柱壳的后屈曲状况，并且能考虑到肋骨的实际截面形状和分布情况，本文将复合有限条方法应用于环加肋圆柱壳的后屈曲分析。在对后屈曲路径的跟踪过程中，使用了正交弧长法。算例表明，复合有限条方法同纯粹的有限元方法相比在速度上能提高10倍以上，并且方程阶数与壳体尺寸无关，是一种分析加肋板壳结构的理想方法；实际应用的加肋圆柱壳在水压下的后屈曲路径一般来说不存在分叉点，在后屈曲阶段，随着变形的增加常常要求压力有所增加。
In order to study the post-buckling condition of the ribbed cylindrical shells subjected to hydraulic pressure and considering the actual cross-sectional shape and distribution of the ribs, the finite strip method is applied to the post-buckling analysis of the ring-stired cylindrical shells. In the tracking of the post-buckling path, an orthogonal arc length method is used. The example shows that the composite finite strip method can increase the speed by more than 10 times compared with the pure finite element method, and the order of the equation has nothing to do with the size of the shell. So it is an ideal method to analyze the ribbed shell structure. Practical application Of the ribbed cylindrical shell under hydrostatic post-buckling path generally does not exist bifurcation point, with the increase in deformation of the post-buckling often require an increase of pressure.