有内底纵骨（inner bottom longitudinal）和 船底纵骨（bottom longitudinal），分别连接在 内底板和船板上，它是连续构件，穿过实肋板。 且船底纵骨的最大间距应不大于1m。
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inner bottom longitudinal 内底纵骨 ; 内底纵材 ; 内底纵向 ; 内底部纵向
bottom web longitudinal 船底腹板纵桁
These supports, in addition to carrying local loads from cargo, etc, serve to keep the deck and bottom from moving toward each other as a result of longitudinal bending of the hull girder.
这些支撑，除运载来自货物等等的局部载重之外，也保持甲板和底部避免由纵向船体纵桁弯曲造成的相互位移。
Endurance cracks may appear in the hull structure at different ship-ages for some ships, especially at the vessel bottom and the longitudinal bone on board side.
有些船舶在不同的船龄阶段，在船体结构上出现疲劳裂纹，特别是在船底、舷侧纵骨中较为突出。
The bottom structure is supported by every longitudinal beam in orientation calculation, and then the orientation force and elasticity supporting force is obtained.
计算时，底部弹性支承在各纵梁上，可求得结构的横向受力与弹性支承反力。
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