Grade Beam Curb - Reinforcement

[Serhiy2]

Good day,

I'm working on a stick-framed building where I have walls on grade beams which are supported on piles. Interior slab is concrete slab-on-grade. In order to create slab/grade beam joint right at the wall, I'm providing the curb. I was intending to have curb cast with grade beam as I have all kinds of anchors fastening my walls and opening posts down to grade beam. My concern is that when beam is in bending, curb reinforcement is in compression (as per strain analysis under ultimate limit state - I haven't checked it under service loads) and can potentially buckle and cause curb spalling. I attached sketch showing the detail. Would be nice to hear your thoughts on this matter and whether I should be worrying about it at all. Thank you

 

[KootK]

This kind of thing is done all the time without issue and without checking. I'd not worry about this.

 

[TLHS]

As a side note, for your own information make sure you sketch your reinforcement detail to scale including bar bends and bar widths if you go with that detail. U-Bars in tight wall caps and curbs can end up being more congested than you expect, and your longitudinal bars end up not where you think they'll be as a result.

 

[jayrod12]

In a standard 6" curb I usually only provide a single horizontal and hairpin dowels as opposed to what you're showing for exactly what TLHS is describing... even at a 10m bar, you're hard pressed to fit 2 horizontals and a u bar.