Design of Precast Barrier Curb Anchoring to Existing Concrete Wall with TL-2 Loading

[Champion2022]

I am designing for a Proposed Precast Barrier (30" height) on top of an existing concrete wall and the Precast Barrier is to resist AASHTO TL-2 Loading. I initially tried to use the Hilti Adhesive Anchors but none of their post installed anchors worked unless the spacing is reduced to 5" on center (due to the concrete pull out failure of the post installed anchors). However, i am now considering an alternative for the Contractor whereby using 1 vertical adhesive anchor (#6 at 12" spacing)anchoring 9" embedment into the existing wall and then supplementing it with 2 horizontal anchors (threaded rods) one into the existing wall and the other into the precast barrier connected through a C8 x 18.7. Would you think this connection is viable for this situation. I am considering that the vertical anchor is stressed to 100% tension capacity of the concrete pull out/bond failure and the remaining tension resistance required is mainly resisted by the lower horizontal anchor into the existing wall. Sketch is attached. Do you think the channel is to be designed for bending based on max. tension in the bottom horizontal anchor and moment about the upper anchor. Has anyone dealt with a similar situation and/or has any recommendations. Appreciate the input.

 

[JStructsteel]

Is the top of the precast wall designed for the impact?

Could you cut the wall down and do a moment barrier?

How long of a wall is this?