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本文首先运用文〔１〕的方法研究了静水外压力作用下环肋锥柱结合壳转折区壳板的塑性极限承载能力，然后研究了凹式环肋锥柱结合壳转折区壳板连同结合处加强环的塑性极限承载能力，得到了上限解。理论计算结果和精车模型实验较好地符合， 对凸壳，偏于安全，对凹壳基本相符。
In this paper, the plastic ultimate bearing capacity of ring-ribbed cone shell combined with shell transition zone under the effect of external water pressure is studied firstly using the method of [1]. Then the study of the concave-ribbed cone-column combined with shell transition zone shell plate together with joint Reinforcing the plastic limit bearing capacity of the ring, an upper bound solution was obtained. The theoretical calculation results are in good agreement with the fine car model experiments. Convex shells tend to be safe and basically conform to concave shells.