Square Steel

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Characteristics of steel tubing?

I'm looking for the specs on various sizes of square steel tubing, mainly the amount of force required to crush the tube or a formula to determine it. If anyone has a link or a formula I would appreciate it. Thanks.
I'm not using it as a column but rather in a horizontal position. I'm interested in finding out how much force is required to flatten the square tubing into a pancake. Say the tubing is laying on the ground and I drive over it, how much force would my vehicle need to put on the tube to flatten it?
Thankyou though Ernest, you may have pointed me in the right direction.

If you are using this structural member as a column (It is loaded axially), then it sounds like you are interested in the critical buckling load. To calculate this, you will need to know the material's yield strength (Sy - 36000 psi for structural steel), radius of gyration (r - function of geometry - look it up in an online table), maximum unbraced length (L), and modulus of elasticity (E).

The minimum force to make the column buckle can be calculated using the following equation (separated into numerator and denominator, since it is so big):

Numerator = Sy*(1-((L/r)^2)/(2*Cc^2))

Denominator = 5/3 + (3*L)/(8*r*Cc) - L/((2*r*Cc)^3)

where Cc = SQRT(2*pi^2*(E/Sy))

Hope this helps!

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