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Engineering Power Tools - Slenderness Ratio

Engineering Power Tools - Slenderness Ratio

Engineering Power Tools - Slenderness Ratio

(OP)
Good morning and Merry Christmas.

My question is in regards to buckling in columns.  I started using the Engineering Power Tools download to check my calculations.  I have run into two challenges I hope you can help me with.

1. I get a different critical load when using Johnsons formula.  I have checked my hand calcs over and over.  I know it is right as I am using a textbook from college for a reference.

2. The slenderness ratio calculated by the software is different than what I solve.  I also noticed the slenderness ration does not change when the end conditions are changed (ie fixed-fixed, fixed-free, etc).

I am calculating the slenderness ratio by multiplying the end condition constant (K) by the length and dividing the result by the radius of gyration.

Is this wrong, or is there a flaw in the program?  Any thoughts?

Daniel

RE: Engineering Power Tools - Slenderness Ratio

Yes, you are correct.

Try a few cases with different end conditions (set L/r = 1) and check the results (k). If still do not agree, send them an inquiry and let us know the answer.

RE: Engineering Power Tools - Slenderness Ratio

(OP)
Thanks for the input, cntw.  I have sent an email to their support group.  I will let you know the response.

Does anyone else use this program?  I just downloaded it yesterday as a coworker pointed me in the direction.  I have let him know of the issue I have, but have not heard a response.

RE: Engineering Power Tools - Slenderness Ratio

Hi GTDan

I have not used the tools to which you refer however I have a link here to another online calculator which might be of use:-

http://www.tech.plymouth.ac.uk/sme/desnotes/buccalc.htm

The slenderness ratio is L/r where L is the length of strut and r is the least radius of gyration of the section.

desertfox

RE: Engineering Power Tools - Slenderness Ratio

(OP)
Thanks Desertfox.  I will check them out

RE: Engineering Power Tools - Slenderness Ratio

Euler's equations work nicely....I use them routinely.

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