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# Thread: square tubing for pipe fence???

1. Member
Join Date
Sep 2012
Location
AZ
Posts
52

## Calculations

Originally Posted by aneuploidy
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. Originally Posted by aneuploidy
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. Member
Join Date
Aug 2009
Location
Wylie, Texas
Posts
39
Originally Posted by Arizona Joe
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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