Lateral Stability Ratio
Lateral Stability Ratio
(OP)
Hello All,
I am currently working on a design of a simple monorail system. Some of my old mentors spreadsheets has a "Lateral Stability Ratio" which can not exceed 40. The equation is the length of the beam divided by the width of the beam. Does this sound familiar to anyone? If so, could you please point me in the right direction to find where something like that is stated?
Regards,
jheydon2
I am currently working on a design of a simple monorail system. Some of my old mentors spreadsheets has a "Lateral Stability Ratio" which can not exceed 40. The equation is the length of the beam divided by the width of the beam. Does this sound familiar to anyone? If so, could you please point me in the right direction to find where something like that is stated?
Regards,
jheydon2






RE: Lateral Stability Ratio
RE: Lateral Stability Ratio
Go to this page of my website and download the Carnegie Pocket Companion - 1934, located near the top of the page. See the portion of the book "Safe Loads For Sections Used as Beams" beginning on page 182. The 40:1 ratio is addressed on page 184.
www.SlideRuleEra.net
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RE: Lateral Stability Ratio
1) A poor man's check on lateral torsional buckling (LTB) or;
2) A poor man's check on lateral stiffness although I wouldn't technically call that stability.
Is there a separate LTB check built into the spreadsheet?
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Lateral Stability Ratio
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Lateral Stability Ratio
RE: Lateral Stability Ratio
www.SlideRuleEra.net
www.VacuumTubeEra.net
RE: Lateral Stability Ratio
RE: Lateral Stability Ratio
As WARrose alluded though, if this is a hung monorail, the trick will be defining the unbraced length between points of torsional support. That's a problem that hasn't really had a codified solution (as far as I'm aware).
I'd recommend reading this thread for sure: http://www.eng-tips.com/viewthread.cfm?qid=387114
There are also a handful of threads about suspended beams here on eng-tips if you want to get into a lot of depth.