Bridge crane design 2

[Steelforbrains]

I need to design a bridge crane to be used at the company where I work. We are planning on adding two 5 ton cranes to ride on one structure on the outside of our shop. The bridge will be about 30 ft long and the support girders will be 75 ft long supported every 25 ft. I need a good resource for standards for determining my loads. I need to know standards for impact loading, seismic loading (in northern Kentucky), approximate loading from impact with end stops, and forces developed from the sway of my load. It is difficult to determine what type of lateral bracing is required without being able to determine the horizontal loads on the structure. I also need info on allowable deflections/stresses, minimum concrete slab thickness, minumum distance to cracks in slab for baseplates. I would prefer that these resources be free (of course) and easily accessible (otherwise read, on the internet), but a cheap handbook would be great too. Are these questions to be presented to the crane distributor, which is TBD. The structure will eventually be covered, does anyone have any objections to supporting the roof with the brige crane columns? Am I asking to much? Thanks for any input...

 

[mrMikee]

Steelforbrains,

You should get a copy of the CMAA #70 spec published by the Crane Manufacturers Association of America, Inc. which is a division of the Material handling Institute. The CMAA is an organization of the leading crane manufacturers in the US. This is a pretty comprehensive spec.

Regards,
-Mike

 

[Lutfi]

Here are some quick sources for Crane design:

1. CMAA #70 and 74 publications are a must have.
2. AISC engineering journal has many articles dealing with the overhead cranes and runway design.
3. AISC design guide number 7 (revised version) is dedicated to the design of industrial building. Crane runway desings is covered in the DG-7.
4. Gaylord and Gaylord structural engineering handbook has some examples for designing bridge cranes and runways.
5. AISC Web site has a spreadsheet that designs runway beams. Check their web site.
6. The Whiting Crane Handbook is one of the most comprehensives publications that deal with cranes including engineering and data. I am one of the few proud owners of such document. They have been out of print for many years. It may be worthwhile to call them and see if it is available.
7. I found crane manufactures and suppliers (hoist, end trucks, control) to be very valuable and helpful. Call them for assistance and information.

If you are AISC member, you can download lots of free stuff including engineering journal articles from first edition to current publications. There web site is :

http://www.aisc.org

Regards,


Regards,
Lutfi

 

[Steelforbrains]

Where can I find the CMAA specs, about how much do they cost?

 

[mrMikee]

Steelforbrains,

This turns out to be a very interesting site. Lots of good stuff.

Material Handling Institue of America website

http://www.mhia.org/

MHIA bookstore

http://www.mhiastore.org/category.cfm?Category=16

CMAA 70 and 78

http://www.mhiastore.org/moreinfo.cfm?Product_ID=158

http://www.mhiastore.org/moreinfo.cfm?Product_ID=97

Regards,
-Mike