Built-Up Shapes in AISC

[antiwheel]

Hi Guys
I got a wierd question from our customer that where in the code of AISC that actually ALLOWES built-up shapes in the structure. In my case, the built-up shape is column and beam that welded from plates.(similar to plate girder).

Anyone knows where I can find a statement that I can use built-up shape in design?

I always think it's common sense that if rolled shape is not available, you have to use something builtup. But this customer is just strict on it.

Thanks

 

[JAE]

Ask the customer where AISC says you cannot use built-up shapes.

 

[BAretired]

Do you have WWF shapes in your handbook? They are built-up.

BA

 

[HgTX]

Why would they have design provisions for built-up members if they're not allowed? If you're the designer, you can do this.

On the other hand, if you're the fabricator and the design calls for rolled shapes, you can't willy-nilly substitute built-up shapes on your own say-so. You need to get the client's or designer's approval. But they should give it as long as you can demonstrate that your built-up piece has the same properties, that its connections can handle the requisite shear, etc.

Hg

Eng-Tips policies: faq731-376

 

[ajh1]

Look at Table B4.1, for example. There are two options for some of the limiting width/thickness ratios, one with rolled shapes and one with built-up shapes.

 

[MaddEngineer]

Just show your client the following, from the AISC Manual:

Chapter D, Tension Members, Section D2, "Built-Up Members"; Chapter E2, Columns and Other Compression Members, Section E4 "Built-Up Members", Chapter F, Beams and Other Flexural Members, Section F7, "Built-Up Members"... And of Course Chapter G, Plate Girders... which are BUILT-UP from PLATES connected by welding or fasteners.

If that doesn't satisfy them, get another client.