Steel Box Girder Design 3

[efFeb]

Hi,
If anyone has experience with designing steel box giders and would be able to share any helpful references, it would be hugely appreciated.
The design is not for a bridge, although many of the resources I have found so far are geared towards bridge design and have still been helpful.
Thank-you so much for your help!

 

[dik]

If memory serves... Lincoln had a publication on the design of orthotropic bridge girders... don't know if it's still available.

Dik

 

[Guest090822]

AASHTO and AISC are about it. AASHTO recently overhauled the box beam design section. I’m not sure if it has made it into the code yet. I evaluated the proposed theory for my DOT about a year ago.

 

[bridgebuster]

It's been a while but...

[ul]
[li]watch out for welded details; try to avoid those that are fatigue prone[/li]
[li]you may need temporary lateral bracing on the box while it's being erected[/li]
[li]will someone have to go in the box periodically to inspect it? If so, paint the interior white, this way cracks will be visible[/li]
[li]make the access doors as large and light as possible[/li]
[/ul]

It's not a difficult design, a little annoying at times. In the bridge world, the geometry requirements for a box try to emulate an equivalent stringer/girder bridge.

 

[Agent666]

Eurocode 1993-1-5 & the older BS5400-3 cover the design of steel plated structures such as box girders.

SCI also do this free guide on composite box girders that might prove useful.

https://www.steelconstruction.info/images/6/65/SCI_P140.pdf

 

[Guest090822]

dik - yes, should have been "evaluated" - LOL

 

[ldeem]

Check out crane bridge design manuals. CMAA 70 and AIST Technical Report No. 6

 

[STrctPono]

I've always found FHWA's publications on Steel Bridges to be useful. They have some design examples for both I girders and tub girders.

https://www.fhwa.dot.gov/bridge/steel/pubs/if12052/

NSBA is another great resource. Check out "Guidelines for Design Details" by AASHTO/NSBA. A lot of good information related to camber diagrams, bearing stiffener details, and cross frame connection details. Some of their publications are specifically geared toward design details and which ones you should consider using and for what reason. If it's straight, it's not too spooky, if it's curved then you need to pay very close attention to the design and detailing of the cross frames. Check your construction phases as well as this is sometimes what governs the design.

 

[mchen96]

As said above, FHWA Steel Bridge Design Handbook will likely be helpful. I've linked the updated manual below.

[URL unfurl="true"]https://www.fhwa.dot.gov/bridge/steel/pubs/hif16002/[/url]

Depending on your application, fatigue may or may not be an issue, but otherwise their resources should be useful.

 

[STrctPono]

Oops, thanks Michael Chen