ACI 350.3 Stiffness Equation

[EngineerRam]

Hi,

In the commentary of chapter 9.2.4 of ACI 350.3, an equation is given to solve for the stiffness of a fixed-base, open top tank. The formula is as follows:

k = Ec/48 * (tw/h)^3

My question is, should the units of the thickness of wall and h cancel out (ie using like units)? Or, should I maintain the original units defined in chapter 1 (tw defined in inches and h defined in feet)?

Thanks.

 

[Bendog01]

EngineerRam

Attached is a page from PCA Design of Liquid-Containing Concrete Structures for Earthquake Forces by Munshi. h is in feet and t is in inches.