采用线弹性和弹塑性有限元方法,对环肋圆柱壳壳板局部凹陷后的强度和稳定性及其加强方案进行研究。结果表明:采用扁钢局部加强可有效降低壳板表面纵向应力和肋骨应力;增大环向加强筋尺寸比增大纵向加强筋尺寸对降低应力值效果更明显,且加强筋端部采用外伸削斜方式效果最好;壳板局部凹陷会改变舱段结构的弹性屈曲模态,使舱段的稳定性略有降低,但对肋间壳板失稳压力影响较小;采用加强筋加强后,可使舱段的稳定性略有提高。 The linear elasticity and the elasto-plastic finite element method were used to study the strength and stability of the ring-stiffened cylindrical shell after its partial sag and its strengthening scheme. The results show that the local strengthening of flat steel can effectively reduce the longitudinal stress and the rib stress on the shell surface. Increasing the size of the circumferential stiffener increases the size of the longitudinal stiffener more obviously, and the end of the stiffener adopts the extension But the local buckling of the slab can change the elastic buckling mode of the structure, which makes the stability of the slab slightly lower, but has less influence on the instability pressure of the slab. , The stability of the cabin can be slightly improved.