ACI 318-08 Appendix D 2

[olsont]

My current design requires using appendix D in the ACI 318 code. I'm having problems with the units in equation D-7 and concrete pryout strength for anchors in shear. Am I missing something in this equation?

 

[Lemony]

As always, f'c should be in psi. If you are using some computing tool with dimensional inputs, normalize the units in the square root and under the power to have units of psi and in^2 after the operations.

 

[olsont]

I'm trying to use Mathcad to set up a program for ACI-318 appendix D. Can you expand on your answer...possibly giving an example?

 

[fancypants]

Generally how i do this in MathCad is to divide by psi inside the radical and then multiply by psi outside the radical to get the unit back.

That is what Lemony means by normalizing the units.

 

[fegenbush]

fancypants,

I do similarly, but multiply (or divide) by √psi as necessary.

One of the perils of Mathcad.

 

[11NPBG]

i m designing reinf. around pintle (steel tube). is there any simple method to calculate force to design reinf.?

 

[Lemony]

I have had this issue with mathcad as well, you need to normalize the argument to the function first; for sqrt(f'c), use sqrt(f'c*psi).