ACI 360 SOG Clarifications

[JoshH726]

Two parts:

1) Curious how others define slab on grade edges with regard to concentrated wheel loads. For discussion purposes, assume a slab on grade with fiber for crack control only and provisions of ACI. Would you consider loads adjacent to interior control joints as an “edge”? How about at a future date where it be reasonable to assume that a slab would have cracked at a control joint? Would you consider a location adjacent to an exterior threshold location as “close” to an edge? If if that threshold would be doweled in over top of a recessed concrete wall?

2) With regard to soil pressure below a slab on grade with a concentrated wheel load, how much additional area would be reasonable to assume below a wheel load contact area by the time to load reaches the bottom of a slab to be be resisted by the soil? What about considering the use of the area calculated using a radius of relative stiffness? Or a similar area considered for punching shear?

Thanks in advance

 

[Lomarandil]

1. Yes, yes, yes, and depending on the detail.

2. Using a punching shear-style perimeter and load spread can be a quick lower-bound check method (although without reinforcement, the depth d is less obvious).

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just call me Lo.