Box Beam Plate Thickness
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Posted by: kenny ® 01/31/2006, 06:09:32 Author Profile eMail author Edit

Does anyone know the derivation of what web plate thickness is required to ensure a box beam can be loaded as a beam and not collapse these vertical webs first. I understand in standard commercially available sections used as beams (I, C, RHS, SHS etc.) that they can be calculated using std beam formulas (or tables) and web buckling can be ignored (as the section has already taken this into account). I am trying to design a box type beam built up of plates with the minimum web thickness (and not use web stiffeners if possible - weight problem) Does Roarks have any formulas for this? Thanks Kenny Kenny B

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Re: Box Beam Plate Thickness
Re: Box Beam Plate Thickness -- kenny	Post Reply	Top of thread	Forum

Posted by: swearingen ® 01/31/2006, 09:08:04 Author Profile eMail author Edit

The American Institute of Steel Construction's Manual of Steel Construction covers this. If you know anyone with an AISC book, borrow it and go through the calcs. If you provide the loading, support description, geometry, and any other data you may have, I can take a look at it.

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Re: Box Beam Plate Thickness
Re: Re: Box Beam Plate Thickness -- swearingen	Post Reply	Top of thread	Forum

Posted by: kenny ® 02/01/2006, 05:31:07 Author Profile eMail author Edit

Thanks for Reply I'm "Down Under" and we have an Australian Standard for Steel Construction also with this sort of info (but limited to max 450MPa yield). I was trying to go back to "first principles" to see where the Standards requirements are derived. I am also using HT steel 700 or 960 Mpa. Thanks Kenny Kenny B

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Re: Box Beam Plate Thickness
Re: Re: Box Beam Plate Thickness -- kenny	Post Reply	Top of thread	Forum

Posted by: swearingen ® 02/02/2006, 07:56:03 Author Profile eMail author Edit

The reason you should use the Manual is that there are many things to consider and the steel manuals address them. They set limits on what the depth to thickness ratios should be based on empirical testing. It can certainly be explained by "first principles", but in some of the more obscure failure modes, those principles are quite involved. Again, if you can provide a picture, loading info, supports, bracing, and any other information you have, I'm sure we can come up with something...

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