Bending moment of square tubing

AI Thread Summary
To find the bending moment of a 9' long square tubing (3x3x1/4" A36) fixed at one end and free at the other, the moment of inertia for the cross-section and the distance from the stress plane to the central axis are required. The load being suspended from the free end contributes to the bending moment, and understanding the connection at the fixed end can enhance accuracy, though assuming rigidity is acceptable. Resources for calculating deflection and bending moments are available online, providing formulas and examples. Clarification was made regarding the dimensions of the tubing, confirming it is indeed 3x3x1/4". Accurate calculations are essential for proper structural analysis.
Brian Simpson
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I have some square tubing 3x3x1/4" A36 that will be fixed on one end and free on the other the material 9' long how was I find the bending moment?
 
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Are you hanging stuff off of it? Bending from what?

You need the moment of inertia for that cross section, you need the distance from the stress plane to the central axis. and you need the forces that contribute to the bending. An understanding of the method by which the beam is joined at one end would make it more accurate, or you could assume it is rigid.
 
yes I am just hanging "stuff" from the end of the beam. the actual beam is going to be 9' long let's just say rigid on one end we are going to suspend the load on the end of the beam
 
Brian Simpson said:
I have some square tubing 3x3x14" A36 that will be fixed on one end and free on the other the material 9' long how was I find the bending moment?

It's not clear what you mean by 3x3x14" tubing. Perhaps you meant 3x3x1/4" tubing?
 
Yes sorry 3x3x1/4"
 
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