How to Achieve Partial Fixity in Bridge Pier Column?

I am using LEAP Steel and LEAP Concrete to model a 4-span, continuous steel bridge on a 2-column pier system. This is an existing bridge undergoing rehab. and columns are on isolated spread footings.  I wish to treat the columns as partially fixed, which involves inputting the desired spring constants KxKx, KyKy, and KzKz, and Rx, Ry, and Rz.  Where might I find information to accurately determine these spring constant based on my type of soil/rock that the footings rest on?  Thank you for any help.

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