ACI 350.3 Stiffness Equation
ACI 350.3 Stiffness Equation
(OP)
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.
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.






RE: ACI 350.3 Stiffness Equation
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.