cold formed steel compression limit

[casasf]

hello,

what is the compression limit ratio for conduit pipes Kl/r? is it 200 like steel or more? if it is different can you provide the reference?

Thank you in advance.

 

[rowingengineer]

It changes between codes, and load type. For EQ you can have an overriding requirement depending on the system being used and design class

http://www.nceng.com.au/

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

 

[r13]

Note that the slender ratio is only a practical index. When it goes beyond the recommended limit, the allowable stress/strength will be too small for practical purposes. You can calculate the result resulting allowable stress/strength by using any code provided formula/equation for compression to get a feel.

 

[rowingengineer]

Retired13, are you sure? Seems like a big statement to make. Wouldn't the slenderness ratio be a way to control second order effects within a compression member.

http://www.nceng.com.au/

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."

 

[r13]

rowing,

Bad language has twisted the meaning. Thanks for picking out.

 

[WARose]

In 1999, the AISI committee removed the KL/r limit (of 200) from the code. I think their reasoning was that (at that slenderness ratio) you'd wind up with such a ridiculously uneconomic design with Cold Form that there was no reason to include it.

 

[dik]

You might look at:

https://www.ce.jhu.edu/cufsm/

neat software...

Dik

 

[Ceinostuv]

You can still find the kl/r≤200 recommendation in AISI S100-16C. I stress recommendation because if we're talking about a member with, say, a kl/r of 205 that is seeing extremely low compression stress and no bending, I'd probably run with it.

Judgement-In-Training