I'm trying to calculate the max load of a rack made of 3X3X1/4 steel tube. It is 8ft long and 4ft wide. I just want to calculate the max load (distributed load) in bending cross the 8ft and also in compression for the legs. i can't find the right formulas. can anyone help?(adsbygoogle = window.adsbygoogle || []).push({});

so far i what i think to be correct

MOI (I)=3.495 in^4

Section modulus=2.330 in^3

MOE (E)=29,000,000 psi ( i think this is correct but i'm not sure. just want to use low grade steel)

I've looked though many sources but end up with

stress=6M / (bh^2)

σ - the bending stress

M - the moment about the neutral axis

b - the width of the section being analyzed

h - the depth of the section being analyzed

Not sure what M is here?

and

σ = (yqL^2) / (8I)

where

σ = maximum stress (Pa (N/m2), N/mm2, psi)

y = Perpendicular distance from to neutral axis (m, mm, in)

q = uniform load (N/m, N/mm, lb/in)

L = length of beam (m, mm, in)

I = moment of Inertia (m4, mm4, in4)

so what i don't have is "q" I want to know how much "q" i can have. right?

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# Max load bending on steel tube.

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