If you aren't dealing with a large amount of material, go with the tube over the channel unless money is absolutely critical. If you send me the forces/dimensions I can run some numbers for you in an unofficial capacity. This means that a load applied directly on the channel will want to twist it instead of purely bend it.Ĭhannels have their uses, but if you really have a bending load GO WITH THE TUBE. This is more academic, but the "center of stiffness" of a channel is actually outside the "C" (to the left of a proper C). You will actually have less section loss with the tube over time than with the channel. All that means is that the parts in compression (the top) buckle to the side before the bottom yields in tension.Īs for corrosion, if you weld the ends completely, the tube will be sealed. Tubes are more resistant to lateral torsional buckling (LTB) which is the most common mode of failure after yielding. As a structural engineer.the tube is the better choice for a few reasons:Īs others have mentioned, the tube has a higher section modulus (bending stiffness) than the channel.
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