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Subgrade Modulus

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Like I said in my last post I am doing a mat foundation 26’x54’.  There is a column line down the center parallel to the longitudinal direction.  Basically a large buried concrete shoe box.  Again since I don’t have a mat foundation design program I have set it up on Risa3D.  I understand (hopefully correctly) that the modulus that I input into the software is the plate value modified for footing size as suggested in Bowles.  What are the dimensions used for the modifying formula.  Should it be the entire 26’x54’ or should it be say the area tributary to one of the columns?  Sorry for the fundamental nature of the question, this is my first time.

Thanks again,



Joseph R. Grill, PE

Verde Valley Engineering, PLLC

2220 Sky Drive

Clarkdale, AZ 86324

Ph. 928-600-5459

Fax 928-649-3659

email: VVEng(--nospam--at)