Perforated rack column modelling 1

[JoeH78]

Dear All,

I have to design a perforated(which has some specific hole pattern in web and at the flanches) cold formed column intended to be used in rack system, My initial entry point would be to apply reduction coefficient depending on ratio of holes in the cross section for axial stiffness, but I'm but a of dubious about on how to modify bending components in stiffness matrix especially for bending and torsion. Your guidance will be appreciated.

 

[jayrod12]

I believe that would be dependent on the design code you're working to. I know that my local cold formed steel code has almost a whole section dedicated to perforated axially loaded members.

 

[SWComposites]

The bigger problem is working out the effect on strength. You likely need test data.

 

[jayrod12]

SW, I don't believe these are new holes in an existing, these are manufactured holes in the racking legs. I've worked these out through the first principle type design requirements for cold formed steel before. The calculations are a bit of a bear, and I wouldn't recommend doing it by hand, but it's doable.

 

[SWComposites]

For static strength, yes, probably doable with a bunch of assumptions and analysis.
But, compression crippling strength is probably difficult to predict, even with some fancy FE analysis.

 

[HTURKAK]

Have a look to the following doc ..








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