AASHTO vehicle impact on retaining wall

[manstrom]

I have a retaining wall along side a road where the county has requested a design for a vehicle impact.

I know IBC and ASCE much better than AASHTO. If this was an IBC load, it would be a 6k load at 1'-6" or 2'-3" depending on the year. But this is a public road. I'm not familiar with the requirements for vehicle loading under AASHTO.

Can someone point me in the right direction? Loading? Height? Load factors, etc? What else do I need?

When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

-R. Buckminster Fuller

 

[ztengguy]

Is this using LRFD or LFD AASHTO Code?

 

[yakpol]

If the road is on top of the retaining wall then you will need to find traffic barrier loads in AASHTO Appendix A13-Railings and the load combination Extreme Event II in Section 3.4. Horizontal load distribution along the height of the wall can be assumed (V:H) from 1:1 to 1:2 (less conservative).
If the road is at the bottom of the wall then you are looking at some local damages in concrete due to vehicle impact.

Hope it helps!