Structural layout method

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Part of a series on vessels'

Structure

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Concepts

structural Layout Method

This is one method of starting a structural design it is not intended to represent the only method but may prove to be a good starting point.

  • This method starts by laying out primary structure first and then filling in with secondary stiffening.
  • Begin by laying out the main deck or weather deck
  • layout deep beams or deep transverses at the predetermined frame spacing
  • Ensure that openings in the deck plating (ie large hatch openings, casings, etc) are supported by primary structure at forward and aft ends
  • Check the maximum spacing allowed by classification rules
  • Review floodable lengths and try to place watertight subdivision bulkheads at primary transverse spacings
  • Avoid breaking deep transverses or deep beams for smaller openings if possible (see revising general arrangement)
  • If 'tween decks exist check spacings to determine if any stringers will need to be fitted as per class rules.

At this point the designer can begin to draw the structure in on the profile and decks drawing. Once structure is on the drawing the designer can check to see if the girders will need to be cranked (over several frame spaces) to accomodate openings in the deck or hull form variations in the bow and stern. If possible it is best to space girders so as to equalize deck beam spans (effective lengths). Try to take advantage of longitudinal bulkheads where possible, and pillar so as to keep effective lengths of primary structure to a minimum.

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