h-20 load rating for grating
 

h-20 load rating for grating?
i'm trying to select heavy duty grating capable of carrying h-20 highway loading from manufacturer catalogs. the catalogs ask for a specific concentrated load or ultimate load rating. i'm having trouble determining what ultimate or concentrated load on the grating is produced by h-20 vehicles to find the max span and bar sizing. any help is greatly appreciated.
thank you,
derek medved
if you are looking for an hs-20 truck, the concentrated wheel load is 16 kips.
i have some catalogue information relating the truck loading vs. the bearing bar size and spacing. i couldn't find it on line. i could fax it to you. it's only a few pages.
one strange thing about grating loading. an h-15 wheel loading sometimes controls over an h-20 due to its smaller footprint.
concur with broekie & jedclampett. h-20 loading is also 16 kips per tire (like hs-20). an h-20 truck has 2 axles - 8 kips on the front (4 kips/tire) and 32 kips on the back (16 kips/tire). hs-20 is essentially an h-20 truck pulling a one axle trailier, 32 kips on the trailer axle (16 kips/tire).
thanks everyone for the links and info. it confirms what i found myself. i found that most heavy duty grating companies will design a grate just from specifying h-20 loading. good stuff to know though. thanks again.
derek medved