The bottom plating is a principal longitudinal member providing the lower flange of hull girder.
船底板构成船体梁的下翼缘板，是主要的纵向构件。
Tests show that the cross section of the whole deck, working jointly as the lower flange of the main girder, should be taken for the calculated section subjected to longitudinal prestressing force.
试验证明，在纵向预应力作用下的计算截面应取道床板全部截面作为主梁下翼缘共同工作。
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