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
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...