PVC Grating

[Koda01]

I need to calculate the allowable load on 1-inch deep PCV bar grating. I have the material properties of the grating, but are unsure on how to determine the allowable bending and shear stresses. My gut tells me that following the same approach as if it was steel is wrong. Has anyone come across this problem?

 

[paddingtongreen]

The manufacturers have safe load tables. The allowable stress should be there, or can be derived from information there.

Michael.
Timing has a lot to do with the outcome of a rain dance.

 

[cvg]

note that PVC creeps. Most safe loads are for short term duration. If you have long term loads, don't use PVC.

 

[Koda01]

My aaplication is as a trench cover around a swimming pool, so long term loads should not be an issue.

I cannot find any load tables on the web for PVC grating, do you know of any?

 

[cvg]

properties of the pvc material are dependant on the resins and the process used and this info should be obtained from the the manufacturer. Allowable loads would also be dependant on the dimensions / geometry of the grate.

 

[MiketheEngineer]

Stongwell comes to mind. Try googling "plastic beams" or "grating" or even "expanded metal". In the past, I have had some luck with all.

 

[paddingtongreen]

Search for FRP Grating, or contact whomever you will buy from to get the manufacturer's name.

Michael.
Timing has a lot to do with the outcome of a rain dance.

 

[TheMan008]

If you can't find load tables for PVC grating, maybe you should hire a competent engineering firm to do it for you.

 

[paddingtongreen]

On thinking about it, I've never heard of a PVC structural grating, only decorative.

Michael.
Timing has a lot to do with the outcome of a rain dance.

 

[Gumpmaster]

Trench drains like this normally have a specific grating that works with the specific product. In the manufacturer's catalog, it should have a load rating. For instance, the ACO Slab drain with plastic grating has a 70psi rating for a 4" width (ADA compliant).

http://www.acousa.com/drain/slabdrain.htm

There are many other configurations available.

I'd recommend not starting something from scratch if you can buy a pre-manufactured product that's already been figured out.