Results 1 to 6 of 6

Thread: Simple Cantilever Lifting Beam Design

  1. #1
    darnhayes
    Guest

    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
    Join Date
    Aug 2012
    Location
    UK
    Posts
    433
    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
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,611
    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
    Join Date
    Aug 2012
    Location
    UK
    Posts
    433
    Did you quote the right post for the first quote, Kelly?

  5. #5
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
    Posts
    2,611
    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
    Join Date
    Aug 2012
    Location
    UK
    Posts
    433
    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.

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •