Stiffened Flat Plates and AISC Code

[Ussuri]

Does the AISC code contain provisions for the design of stiffened plates subjected to out of plane bending such as plate buckling and local yielding? If not, does it make recommendations on which code to adopt?

 

[kslee1000]

How the plate is stiffened, and how load is applied?

 

[miecz]

If you are concerned with plate buckling, I believe you are out of the realm of AISC provisions. Long ago, I was involved in developing design standards for stiffening ducts for utility boilers. As I remember it, I based the plate buckling design on provisions found in AISI's Cold Formed Steel Design Manual. Because the cold formed industry uses a lot of thin plates that work in compression, they have included more research on plate buckling into their code.

 

[kslee1000]

miecz:

The theory shall be the same for either cold formed or hot rolled thin plates, am I wrong? Is it warp or buckle under compressive force? Just curious.

 

[Ussuri]

kslee1000

The plate is a flat plate stiffened with longitudinal and transverse plates. The loading is applied through connections to the plate which transfer both moment and compression.

The copy of the AISC I have makes no mention of stiffened plates so I expected that this would be outwith the scope. I wondered if it had a reference to another code.
The client would like us to use AISC.

If there is no guidance in the code then it falls to me to select an appropriate code and propose this to the client. In which case I would be leaning toward EC3 or DNV RP C201.

 

[miecz]

kslee1000

You're right, the theory is the same. But the cold formed steel industry uses a lot of thin plates, while AISC generally uses stockier elements. So AISI has more sophisticated plate buckling provisions. At least, that was the case 25 years ago.

 

[JStephen]

I've used the provisions for Stiffened Compression Elements in App. B of the 9th Ed. book.

 

[penpal97]

are you talking about something that looks like a corbel? Or something like a corbel being bent out of plane along w/ a vertical load?

 

[JJMT]

When ever i need to actualy design somthing instead of look it up in a table, i refer to the classic "Design of Welded Structures" Bloodgett, Section 6.4 - "How to Stiffen a Panel" could be a good start.

 

[kslee1000]

I assume your stiffeners are in the plane orthogonal to the plane of plate (like web stiffeners). If this is the case, shouldn't the stiffener plates bore the brunt of the out of plan forces? Please correct me if I am wrong.