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Thread: square girder versus cylinder

  1. #1

    square girder versus cylinder

    I have a beam question, that I can't seem to find a right answer for.
    Consider a squere hollow profile of say aluminum, height 7 cm and width 3 cm. It can carry a certain weight as a girder. If I want to compare this profile with a hollow tube with the same wall thickness. Is there a rule of thumb that says what the radius should be to carry the same weight?
    So how much does the cylindrical shape contribute to it's bearing capacity

  2. #2
    Technical Fellow jboggs's Avatar
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    Study area moments of inertia. You will get the answer to your question.

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