主船体梁由上甲板，顶边舱，斜边舱和双层底组成。
The main hull girder to consist of upper deck, topside tanks, hopper tanks and double bottom.
此时转换主梁则在较小的传力区域内承受集度较大的竖向力，受力变得不利，梁底容易集中出现较大的拉应力。
At this point conversion, beam bear a greater vertical force, the bottom of beam appears large tensile stress easily. The conversion layer slab with upper wall appears stress concentration easily.
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