k value for slab-on-grade

[Okiryu]

Hi, are the k values for slab-on-grades based on 30" dia. or 12" dia. plate?

I understand that for rigid pavements, k values are based on a 30" dia. plates, but not sure if this also applies for slab-on-grades of buildings.

Thanks in advance for your help !!

 

[thaidavid40]

Around here, most of the engineers whom I know, use a 30"-diameter plate, as the smaller plates give an unusably-high k-value, when used for rigid slab support.

Thaidavid

 

[Okiryu]

Thanks for the information. Although this number should be used with care, it is good to know how it can be verified at the field.