In general, you need a grating thatn is 1/4" deeper than plain tread grating to carry the equal loads. For your case, I would think a 15 degree slope is close enough to a horizontal plane to use manufactueres load tables, and then pick the next deeper section to account for teh serrations.
If one had to perform impact testing, what is the impact test reference (I know it is colloquially called Charpy v-notch) and what is the mimimum impact energy? Thanks in advance.
