Steel Box Sections

[PerStr]

Hi all,
I need more information about the design of steel box sections with transverse and/or longitudinal stiffeners, including sections with slenders components (flanges or webs).
If you know some references that deal with these issues I would appreciate you to respond this post.

Thnks a lot.

PerStr.

 

[JStephen]

I think the AISC manuals cover these in reasonable detail.

 

[PerStr]

Ok, both the 9th edition and the new edition of the AISC specs have provisions about slender elements under uniform compression; but, what about of slender webs under stress gradient??. What about the effective width of these elements??? How to consider in case of a built-up box comprised of welded plates?? Should I take the AISI provisions for this case??

Thanks in advance.

 

[MichSt]

You don’t mention, but I assume this component is part of a building since you are talking about AISC and AISI specs. The AASHTO LRFD specs cover in detail the design of built-up box girders for bridge applications. AASHTO is going to be more conservative than AISC, but you could always use AASHTO as a “reality check” for your design.

 

[miecz]

As I remember it, the effective widths and other provisions of AISI are based on tests of cold formed shapes. I believe the cold formed shapes benefit from the cold forming process. As such, I don't believe AISI formulas apply to welded construction.

 

[PerStr]

Thanks,
In fact the structural elements are part of a ship loader.
The steel box sections are the main elements conforming a frame.
Something like this:

| | |
|________| PLATFORM______|
| | W/COUNTER |
| | WEIGHT |
| | |
STEEL | |STEEL |
BOX | |BOX |
SECTION| |SECTION |_________
|________| |_________|
| | |TRUSS
| | |FOR
| | |CONVEYOR
|________| PLATFORM__________|
| |
____|____ ____|_____
| | | |
_|_ _|_ _ |_ _|_

FRONT VIEW LATERAL VIEW

The elements are under axial, flexion and torsion forces.
If you have any additional comments, welcome!!!

 

[PerStr]

Sorry for the previous post.
Don't take into account the "sketch".

Thanks.

 

[PerStr]

What about CMAA??