Which one would be stronger?

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What would make a stronger support 2" 11 gauge tubing or 1-1/2 3/16" tubing?
Reply:Rigidity is more a function of diameter than wall thickness, so the bigger the better.
Reply:not enough info to give a true answer,  are you trying to keep it from twisting? Bending? or collapsing? what orientation is the support in in comparison to the load?There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:Yep!  I vote for the 2"  11 gage.
Reply:Originally Posted by ThorsHammernot enough info to give a true answer,  are you trying to keep it from twisting? Bending? or collapsing? what orientation is the support in in comparison to the load?
Reply:so the eight buttwelds are holding the tank?
Reply:That's what I was planning, you don't think it will hold?
Reply:This is what I am replacing.
Reply:Maybe this design would be better.
Reply:Use the 2 inch 11 ga, it is about twice as strong compared with the 1.5 inch x 3/16.  If your welds are good your design will work fine.  I'm assuming the tank is plastic and the max. load is about 2500 pounds.I think I would put some plates on the bottom of the legs and set it on some pavers making sure it was level before placing the tank on it and loading it with water.
Reply:If you used the same principle that was used with the wooden frame you would have a much stiffer framework.  Notice the diagonal braces on each of the four sides.  Whenever you make a triangle things lock up.  With rectangles things hinge at the corners.
Reply:You should put fully weld end caps on the two end pieces.
Reply:Yep, nearly twice as strong, i.e. experiencing half the bending stress. Try this:http://www.engineersedge.com/calcula...re_case_10.htm[2" 11ga][1-1/2" 3/16"]b2.00001.5000d2.00001.5000k1.76081.1250h1.76081.1250I0.53230.2884Moment of Inertia (in^4)XMT304 (school)SP125+ (home)HF 4x6 BandsawGood judgement comes from experience and much of that comes from bad judgement.
Reply:deletedLast edited by ezduzit; 05-08-2013 at 08:48 PM.
Reply:Originally Posted by kaldYou should put fully weld end caps on the two end pieces.
Reply:Your original design will be more than adequate for strength with either size metal. Your biggest weakness will be in the uprights. Add some gussets/braces from the upright to the bottom of the outside top frame and use the cheaper of the two sizes listed above. You could eliminate the entire bottom ring if you wanted doing it this way and eliminate much more flex than the ring alone would. As stated above....triangles. Gussets or braces across the corners of the top frame would do wonders as well. My $.02Last edited by ProCharger; 05-08-2013 at 11:09 PM.
Reply:Quote:Originally Posted by kald You should put fully weld end caps on the two end pieces. Originally Posted by DsykesYep, I will do that, just didn't include it the drawings.
Reply:Originally Posted by DsykesMaybe this design would be better.
Reply:11ga is adequate, very strong stuff actually.  Use some cross braces, or gussets at the corners.The real enemy of anything in your situation is rust.  Keep the steel off the ground.I use this method on all stuff that's outside exposed to the elements.  It's cheaper than a concrete pad or footers.Simply a 4x4 treated lumber sleeper bolted to the bottom.  The angle iron makes for a good attachment point.  The lumber will last a long time, and is easily replaced.  I use this method for tables, racks, corral panels, and ANYTHING touching the ground.  It really works."Any day above ground is a good day"http://www.farmersamm.com/