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| You can still figure your section modulus with the tube. Deflection can be a big issue with any, especially the tubing. However, the square will have less deflection. Now, an important consideration is how heavy walled will the tube be vs using a beam. Looking at this as a farmer, yep, tubing is neat, easy to work with, so on. 40' x 12" x 34# wf beam is $844. Just bought some. Price the tubing. You can get more out of a beam than the tube as far as strength per pc/cost. | |
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Square vs. rectangle? Tube bridge physics.
