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Thread: Simple Cantilever Lifting Beam Design

  1. #1
    Associate Engineer
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    Simple Cantilever Lifting Beam Design

    Hi all,

    I am struggling with designing a lifting beam for an offshore platform.

    It will be a cantilevered I beam, capable of lifting 4T weight using a pulley on the end, (1500mm from the support). The material will be S355.

    Can any one bring me through the calculation/method in order to select the correct I beam please?

    Cheers,

    Darren

  2. #2
    Lead Engineer Cake of Doom's Avatar
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    How long is the "tail" of the lifting beam or is it a true cantilever? You'll also need to account for the weight of the lifting gear, stall load and factors of safety.

  3. #3
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Cake of Doom View Post
    How long is the "tail" of the lifting beam or is it a true cantilever?
    To find the loading scenario and a calculator to determine deflection and maximum stress, look here:

    Beam Deflection and Stress Calculators


    correct I beam


    Ixx and Iyy are the numbers you need to use in the deflection calculators above.

    W-Flange I Beam
    STEEL BEAM AND COLUMN ANALYSIS / CODE CHECK


    or

    Wide Flange I Beam Section Properties #1

    Wide Flange I Beam Section Properties #2

    Narrow S Flange I beam Section Properties

  4. #4
    Lead Engineer Cake of Doom's Avatar
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    Did you quote the right post for the first quote, Kelly?

  5. #5
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by Cake of Doom View Post
    Did you quote the right post for the first quote, Kelly?
    I thought your question was better than the op's. The op will need to be more specific if they are to get help or find the solution.

  6. #6
    Lead Engineer Cake of Doom's Avatar
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    Oh, I get you now. Last thing on a Friday so I'm allowed to have a "moment".

    To the OP: With this being off shore, you'll need to check the specific codes of marine work. It won't be as simple as just sizing a beam to carry 40 kN; they'll be (possibly quite heavy) environmental loads too. There are also different standards for permanent and temporary installations.

    As Kelly pointed out above: the more information you can supply, the better the answer will be.

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