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So I have a square tube of 40mm, 3mm wall thickness with a length of 1 meter. Both ends are fixed 25mm inwards. Load is 3kg centerpoint. Steel is SJ235.

I need to know the deflection of this beam.

Thought this would be easy to find in 2023, but apparently all that exists are crappy calculators. I did find some specs though: https://eurocodeapplied.com/design/en1993/chs-design-properties

Anyone have a good tool/software or suggestions how to calculate this?

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  • $\begingroup$ what do you mean by fixed 25 inwards? $\endgroup$
    – Forward Ed
    Commented May 28 at 0:38

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The formula is shown below. For load in the mid-span, set a = b. You need to figure out E, I yourself.

enter image description here enter image description here

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  • $\begingroup$ I realize its a picture, but would the deflection units be mm if mm was chosen for E, I, L, a, and b? To OP, be consistent with your unit selection. $\endgroup$
    – Forward Ed
    Commented May 28 at 0:42
  • $\begingroup$ @ForwardEd Yes, always use a consistent unit system. $\endgroup$
    – r13
    Commented May 28 at 3:09

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