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  1. #11
    Join Date
    Sep 2012
    Location
    AZ
    Posts
    52

    Default Calculations

    Quote Originally Posted by aneuploidy View Post
    Thanks. So it looks like you get much stronger by going up in diameter. Is there a chart that has those figures or did you have to calculate them. I ended up buying 3" 11 gauge for the line posts and 3" 3/16 for the end/ corner posts.
    Thanks again
    I calculated them by hand, but here is a web site that will calculate the properties of any square tube for you.

    http://www.engineersedge.com/calcula...are_case_4.htm

    One easy way to compare different sizes is to compare their Section Moduli. The bigger the section modulus the stronger the member. If the section modulus of one member is twice that of another member, then that member is twice as strong as the other.

    Your new 3" 11 gauge tubes are 47% stronger than the 2 1/2" 11 gauge tubes. The calculation of the 3" x 3/16" is left as an exercise for the reader .

  2. #12
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    604

    Default

    Quote Originally Posted by aneuploidy View Post
    Thanks. By vertical, do you mean running the 1/4" x 3" from top to bottom rail?
    Thanks again for the advice
    Yes, top to bottom. You could also run diagonally too. depends how much you want to invest in material.

  3. #13
    Join Date
    Aug 2009
    Location
    Wylie, Texas
    Posts
    39

    Default

    Quote Originally Posted by Arizona Joe View Post
    I calculated them by hand, but here is a web site that will calculate the properties of any square tube for you.

    http://www.engineersedge.com/calcula...are_case_4.htm

    One easy way to compare different sizes is to compare their Section Moduli. The bigger the section modulus the stronger the member. If the section modulus of one member is twice that of another member, then that member is twice as strong as the other.

    Your new 3" 11 gauge tubes are 47% stronger than the 2 1/2" 11 gauge tubes. The calculation of the 3" x 3/16" is left as an exercise for the reader .
    Thanks!!!
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