AISC vs AISI Design checks 1

[CaliEng]

Generally, what is the difference between AISC and AISI design checks? I understand that AISI is for cold formed steel.
I am designing small stainless steel structures, which i understand would follow AISC Design Guide 27 (select differences / modifications to AISC), but some member sections are not within AISC, and are within AISI, so looking for a bit of clarification.
Thanks

 

[haynewp]

From what AISI I have done before I know it has a lot more local effects of cross sections that have to be considered when the metal is thin.

 

[JoshPlumSE]

AISI is all about local buckling effects. AISC mostly ignores local buckling of the cross section. Not entirely.

For that reason if the b/t ratio of a flange or d/t ratio of a member's web are high then it will be an AISI shape. If not, then it will be an AISC shape.

My comments are an oversimplification. But, a reasonable one.

 

[r13]

I think the steel producing process counts for the difference, hot rolled vs cold formed (forged/pressed), as the process affects material properties.

 

[Lomarandil]

There are material properties affected (positively) in cold formed metals, but those can be neglected... Josh is spot on about local buckling being the driving factor.

Also note that the combined force interaction equations from AISC do not apply.. and additional combined checks are required in some cases.

----
just call me Lo.

 

[Aesur]

Why not use SEI/ASCE 8-02 Specification for the Design of Cold-Formed Stainless Steel Structural Members? Link

 

[r13]

It's a pretty much worldwide recognized practice that - use AISI for design of cold formed steel, and AISC for hot rolled steel. Link

 

[CaliEng]

Thanks for the input

So how would Design Guide 27 differ from SEI/ASCE 8-02?

So if a section is not found in one of those standards, is it appropriate to approximate is and analyze under the other? I.e. lipped channel approximated at C channel analyzed under AISC Or I have a existing non-slipped Channel, can I model that under AISC

Also I.e. HSS round is not found within AISI

Thanks

 

[r13]

If the steel is hot rolled (mild iron steel) shape but wasn't list on AISC manual, use the geometry parameters from available sources, or calculate by yourself, then design use AICS provisions and hot rolled steel properties for that shape.

I don't know DG27, nor SEI/ASCE 8-02, so no comment.