ISO 12215-5-2019 questions/issues

Discussion in 'Class Societies' started by Midja, Oct 15, 2022.

  1. TANSL
    Joined: Sep 2011
    Posts: 7,369
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    Location: Spain

    TANSL Senior Member

    Cheer up, it is possible to understand ISO 12215 even if it is terribly daunting.:):)
     

  2. Midja
    Joined: Oct 2022
    Posts: 20
    Likes: 0, Points: 1
    Location: Norway

    Midja Junior Member

    It is me again :D With every day I am closer to the finish line; I have successfully calculated all structural elements except bottom stiffeners, transom and watertight bulkhead. So my questions are:
    1) Stern transom and watertight bulkhead is a sandwich with plywood core; as ISO says (picture 1): "...sandwich theory does not apply for core carrying bending loads " and "a table similar to Table H.4 should be used...what does it mean by similar? What values should be in that table? Does anyone have some example?
    2) I have outboard at transom and I have looked at Annex K. Is there any procedure how to apply those forces except through FEM?
    3)Bottom stiffeners (transversal structural elements - floors) are only plywood plank with thickness of 20mm, that is laminated on bottom. Example in ISO is for top hat, does anybody how to calculate laminated plywood stiffener?

    Thanks!
     

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