Moment slab on Sheet Pile wall

[JohnFarley]

Does anyone have a design example or other reference for for a concrete traffic barrier/moment slab atop a sheet pile wall resisting live load impact? The concept would be similar to a barrier mounted on top of an MSE wall.

I am looking to be able to assess stability of the barrier/slab and correctly transfer the impact forces into the sheet pile.

Thanks.

 

[PEinc]

Check AASHTO. It gives a vehicle impact load (I think it's 10 kips) acting at the top of the Jersey Barrier (about 2'-8" above the roadway). AASHTO lets you distribute the load over 5 LF of wall. Therefore, you have a load (10 kips) , a distribution (2 klf), and a location. Add it to your sheeting design.

 

[JohnFarley]

PEinc,

Thanks for the reply. I'm familiar with the AASHTO requirements, but I thought there might me something more to a moment slab/barrier system. Is it feasible to assume that there is some resistance to the horizontal force by friction between the slab and the subgrade?

 

[PEinc]

I have designed cantilevered and tiedback soldier beam walls where I mounted the barrier on top of the soldier beams. There was no moment slab. The barrier and sheeting wall became one. If you have a moment slab, I would think that the wall would need to be designed for the horizontal force due to the moment slab sliding against the wall but that the wall would not need to be designed for moment due to the barrier trying to overturn. Agree?

Friction would help prevent the moment slab from sliding but that force would push on the dirt which would push on the wall (as I said above).

 

[JohnFarley]

Sounds good. I'll proceed in that vein. Thanks very much for your help.