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Thread: Stress and Moment calculation problem

  1. #1
    Associate Engineer
    Join Date
    Dec 2017

    Stress and Moment calculation problem

    Hi All,

    This is my first post here !
    I have got a problem at work for which I would like your input to solve.

    As seen on the attached picture I want to decide if the 12mm fish plate attached is going to be sufficient to handle the stress or will I need to add ribs to stiffen it better.

    How do I calculate the bending moment & reactions at point A and B.

    All dimensions are in mm.

    Please let me know if I need to provide additional information.

    Thanks in advance, look forward to your reply

    Attached Images Attached Images

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    Do you have access to FEA software? This is a complex section and the manual calculations are very complex and time consuming..
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Jun 2017
    Vin, since your 12mm plates are as thick or a bit thicker than the Z & C channels, my thought would be that bending of the flanges of the Z & C channels may be the controlling factor in the deflection.
    In which case, you will likely want FEA, as Kelly suggests.
    Also, are you (can you?) assume that what is between the Z channels & the 14kN load is rigid? Is there a weight acting downward in your diagram, that would add give combined stresses?

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