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Units problems, Concrete shear formula

Forum|Forum|8 years ago
April 5, 2018
6 replies
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Hi, college student new to Mathcad here. I'm having trouble with the units of a concrete shear formula. I put units to the unit weight correction factor, lambda, but that didn't help.

Help would be much appreciated!

Other

Best answer by Werner_E

As Valery already pointed out - look at your definition of lambda - is this really what you intended?

BTW, don't post just pictures - its hard to debug a picture. Always post your worksheet as well. You may have to zip it first because a severe bug in this forum often prevents you from uploading the file as it is.

V

ValeryOchkov

24-Ruby IV

Sorry, but what is it

F

Fred_Kohlhepp

23-Emerald I

A very neat work-around for an empirical formula that takes the square root of a stress.

W

Werner_E

Answer

25-Diamond I

As Valery already pointed out - look at your definition of lambda - is this really what you intended?

BTW, don't post just pictures - its hard to debug a picture. Always post your worksheet as well. You may have to zip it first because a severe bug in this forum often prevents you from uploading the file as it is.

24-Ruby IV

23-Emerald I

23-Emerald IV

Please attach your worksheet. You may have to ZIP it first. A serious bug in this forum often prevents from attaching a mathcad file. In Windows Explorer click with the right-mouse button on the mathcad file and select 'Send to' -> 'Compressed (zipped) folder'. The resulting .zip file can be attached.

Success!
Luc

F

Fred_Kohlhepp

23-Emerald I

My first guess was that you had a unit mis-match,especially after reading Luc's rant about lambda, but you don't.

Prime is notorious for getting the "labels" wrong. It's possible (in Prime) to have two things look exactly or nearly the same and be different things; you can have a variable m and it can be six meters long and write m := 6 m. If the first is labeled "variable" or "-", and the second is "unit" Prime will happily continue. But if you created something in the red rectangle with one label, and in the rectangle it has a different label, Prime will refuse to continue.

Check that.

J

joswizz

Author

1-Visitor

Thank you all for your quick replies. I appreciate it very much!

S

SPRstructur

15-Moonstone

if not wrong, You refer this.

The problem that you can't solve it because shear stress. just put psi because it from testing and result with square root but it keeping still Stress unit .
Hope it useful.

W

Werner_E

25-Diamond I

Yes, as Fred already wrote its an interesting workaround to be able to use an empiric formula where f is expected in psi and the square root of it is taken.

Guess most of us would have done it the "usual" way: remove the unit by dividing by the asked for unit, do the calculation (root) and then add the proper unit.