![]() ![]() As Inspiration Tool says you are looking for the best value of I the moment of inertia. ![]() Deflection wise is an i beam stronger than heavy wall square or rectangle tubing? I'm trying to find out pound for pound whats the best for the least amount of money, like everyone else Thanks, DougOn a pound for pound basis the I beam is going to deflect the least, rectangular tube with the longest dimension vertical is next and square tube will deflect much more. I was wondering what is the best material to use for a beam in the horizontal position, supported at both ends. This is actually how I'm building my system, its 20' long and has about 1/2 the weight of a standard beam of the same strength, it has taken alot more work to build however. A typical I-beam is another good example, you can see why the beam would be stronger when loaded on the flanges, across the depth of the beam, vs from the side where it would bow fairly easily.Īnother option is to build a beam, from HSS members in a trussed style. The example of the flatbar is also a good illustration. ie If the tube is tall and skinny, and the load is imparted from above the member will take more load than if that same part was loaded from the side. If you are looking at two HSS sections of material, both are the same weight but one is rectangular and one is sqr, the tall/skinny piece will usually be stronger over the sqr pc of the same weight, but only when orientated so that the load is imparted on the skinny face, parrallel to the major length/side. I'd like to clarify a bit what DareBee said. ![]() Both can be easily D & T'd, however the lighter walled tubing's might not lend themselves to this as well as the heavyer sizes. Beam are usually more work in making connections, usually it requires bolt up clips/plates/angles as has been shown in the pic's on this thread. One good rule of thumb is that if the beam can EVER be placed under some type of torsion or twisting load, use HSS If its purely a static application, beam can usually work. If we sit down and look at the bare numbers typically for the same weight the beam will have more strength, however beam isn't w/out its little vice's either and the bottom line really depends on the application. This of-course translates into weight as we know steel is sold based usually on weight. Usually us hobby type people look mainly at the cost of the project. There are several ways of looking at structural design. ![]()
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