Boat Structure Terminology of The Elements of Boat Strength: For Builders, Designers, and Owners

Discussion in 'Boat Design' started by Chris Harding, Jun 23, 2022.

  1. Chris Harding
    Joined: Jun 2022
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    Location: Oregon

    Chris Harding New Member

    Hello,

    I am studying[1] and the terminology is above my pay scale. Specifically, I am concentrating on chapter 19. I provide a few examples that I can't find on the internet.


    Topsides-Frame-Flange Width

    Deck-Beam-Web Height

    Deck-Beam-Flange Width

    Also, what does web and flange mean in boat construction terminology. I feel like it is a stupid question but I need to understand the terminology.

    References:

    [1] Gerr, Dave. The Elements of Boat Strength: For Builders, Designers, and Owners . McGraw Hill LLC. Kindle Edition.
     
  2. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Welcome to the forum.
    If you don't have access to something like the AISC Steel Construction Manual or the ABS Rules, here is a site that explains web and flange for a simple I-beam.

    I-beam - Wikipedia https://en.wikipedia.org/wiki/I-beam

    When we look at vessel structure, often the web of a beam (frame, longitudinal, stringer, etc) is attached to the shell, bulkhead, or deck. In these cases there is a particular (varies with the rules) width of the shell, bulkhead, or deck that becomes the effective flange. From there typical structural analysis applies.
     
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  3. Chris Harding
    Joined: Jun 2022
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    Location: Oregon

    Chris Harding New Member

    I found this excellent reference from 1918.

    Modern Shipbuilding Terms. (1918). United States: Lippincott.
     
  4. jehardiman
    Joined: Aug 2004
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    Location: Port Orchard, Washington, USA

    jehardiman Senior Member

    Just to make sure here...., because you used metal shipbuilding terminology,....what exactly are you building in? Steel? Al? Wood? Composite?
     

  5. mc_rash
    Joined: Aug 2020
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    Location: Netherlands

    mc_rash Junior Member

    1. Width of the flange of the topsideframe
    2. Height of the web of the deckbeam
    3. Width of the flange of the deckbeam

    Did you read the previous chapters 13 - 18, or maybe the whole book? Could be helpful even if there is no specific explanation of what a web and a flange is, since the book is written for designers and builders who usually know what is stiffening in boat construction.
     

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