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Thread: Compressive strength of a square tube.

  1. #1
    Associate Engineer
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    Compressive strength of a square tube.

    I would like to find out how much force I can apply to the ends of a steel square tube before it starts to yield. 3" Sq x 1/4" Wall. Is there a formula for this or is using the materials yield and cross sectional square inches something will work. Material is a500. I can't seem to find a simple formula for this. Can someone help me with this?

  2. #2
    Administrator Kelly Bramble's Avatar
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    Your description on the loading is vague "how much force I can apply to the ends of a steel square tube". Bending, compression, column loading, uniform, etc..

    A free body diagram would help.

    Please be aware that I doubt the formula is "simple".
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
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    Kelly, Its a rack system. The tube will be under compression similar to column loading I guess. Max load on each tube would be 7,500 lbs Vertically. Thanks for any help.rack.JPG

  4. #4
    Administrator Kelly Bramble's Avatar
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    On this webpage, towards the bottom there are links to Column Loading calculators, books, etc.

    https://www.engineersedge.com/Engine...lumn_14511.htm

    Even more on this web page, use "ctrl F" to search the webpage for "column"

    https://www.engineersedge.com/calculators.htm

    The area moment of Inertia for your section geometry can be determined here:

    https://www.engineersedge.com/sectio...ies_menu.shtml

    and here

    https://www.engineersedge.com/materi...pes_viewer.htm

    You could also model your frame with this "Statics 2D Modeler and Structural Loads Calculator " tool and simulate the deflections and resultant loading.

    https://www.engineersedge.com/calcul...d-modeling.htm
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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