Questions about tranverse frame

Discussion in 'Class Societies' started by DUCRUY Jacques, Jan 27, 2011.

  1. DUCRUY Jacques
    Joined: Nov 2009
    Posts: 75
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    Location: france

    DUCRUY Jacques Junior Member

    Hello,

    I have few questions about the calculation of tranverse frame when I use ABS ORY or ISO rules.

    1) How calculate the pressure (before factor Kl et Kar) ? The rule said this pressure correspond to a point situated at mid-length of the frame, but it is the mid-length of the chord OR the mid-length of the girth ? It is not always the same !

    2) The ISO rule take in account a curvature factor, and the ABS not : can I said that the ABS SM of a frame is too strong ?

    Thank you by advance

    Best Regards


    Jacques
     
  2. Paul Kotzebue

    Paul Kotzebue Previous Member

    1. I suggest using the more conservative of the two locations.

    2. No! Never "mix" scantling rules. Choose the appropriate rule for your application and stick with it.
     
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    I agree. Mix and matching rules is not a good idea.
     

  4. DUCRUY Jacques
    Joined: Nov 2009
    Posts: 75
    Likes: 1, Points: 0, Legacy Rep: 15
    Location: france

    DUCRUY Jacques Junior Member

    Thank you very much.

    But it seems to me that ABS ORY is more "severe" that ISO in few domain, for exemple in case of grounding (for a boat of 10m, the impact force is 1.5 * Displ. vs 0.8 * displ.).

    Good evening


    Jacques
     
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