当舰船设有长度较长但开口较多的上层建筑时，其船体结构的复杂性使船体总强度很难用常规的梁理论方法确定。
For a naval ship with a long strength superstructure and a lot of hatch, it is difficult to evaluate the hull girder's strength by general beam theory because of the complexity of the hull structure.
最终给出剖面等强度设计一般的指导性原则，及整个上层建筑范围内的结构设计原则。
Finally, the basic guide principles are given about equal strength design of a certain section and also the whole range of superstructure.
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