Road Plate Design

[alwayslearning123]

I am looking to design a road plate to carry a point load right smack in the middle of it. The Road plate would be supported on all 4 sides, however i feel that assuming that the plate is only supported on two sides and would only be bending in one direction is very conservative. Does Anyone know where I can find a good source for road plate designs? Is there a manual or online source?

Thank you.

 

[CANPRO]

First you need to define your loads. I am in Canada, I would use the Highway Bridge Design Code (CSA S6). I don't have the code in front of me, but there are a couple of different wheel loads to consider...depending on the size/orientation of your plate they may or may not be in combination with each other. Loads are something like 88 kN over an area of 610mm x 305mm or 25 kN over 305mm x 305mm. Then there are some load factors and dynamic load factors (1.7 and 2.0 I think). From there I would use Roark's Formulas for Stress and Strain to size the plate.

If you want a manual specific for road plates you might try searching NAVFAC for a design manual...they're full of useful information.

 

[JStephen]

I would think the highway department or somebody already had tables of standard width/thickness for this kind of stuff.

 

[WARose]

I would think the highway department or somebody already had tables of standard width/thickness for this kind of stuff.

From what i understand, it's almost always 3/4" thick. I don't know if they have plates they reuse but that thickness is typically enough. (Not that the numbers shouldn't be run on it though.)

 

[dicksewerrat]

Ask the firms that rent barricades, flashers and concrete barriers. They sometimes rent the road plates. Ask about their design process.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com

 

[bridgebuster]

Try this link

Http://www.eng-tips.com/viewthread.cfm?qid=177907

 

[alwayslearning123]

Thank Everyone! I found my answer from the last post.