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Steel Box Sections

Steel Box Sections

Steel Box Sections

(OP)
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.


RE: Steel Box Sections

I think the AISC manuals cover these in reasonable detail.

RE: Steel Box Sections

(OP)
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.

  

RE: Steel Box Sections

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.

RE: Steel Box Sections

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.  

RE: Steel Box Sections

(OP)
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!!!


 

RE: Steel Box Sections

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

Thanks.

RE: Steel Box Sections

(OP)
What about CMAA??

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