甲板纵桁（deck girder）是甲板结构中，沿船长方向布置的纵向强构件，常用剖面尺寸较大的组合T形材制成，是甲板结构中的重要构件。甲板纵桁作为横梁的支点，可以减小横梁的尺寸，同时参与船体总纵弯曲，起着保证甲板纵向强度和力的传递作用。甲板纵桁通常在甲板下设有2至3道，两道要与舱口边板对齐，兼做舱口纵桁。
柱子用于支撑甲板纵桁，纵向或横向。
Pillars are used to support deck girders, longitudinal or transverse.
机械装臵、带缆桩、艇吊和其它重型负载集中区域下方的甲板应采用短纵桁或复板进行加强，具体应经过船级社认可。
Decks under machinery, bollards, boat davit and other heavy concentrated loads to be reinforced by carling or welded doubler where necessary as approved by Class.
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。
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.
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