Local stresses in pipe at support
Local stresses in pipe at support
(OP)
I am trying to analyse the local stresses in pipe (24" sch. 20) at a support without pipe shoe. I have used the euqations shown in the attached file. These equations are taken from "Formulas for stress and strain" by Roark.
In 5th edition of the book, the coefficient for 3rd equation is "-1" while in 6th edition it is -1.56. I wonder if any body have the original paper these equations have been taken from and confirm which coefficient is correct.
Could some body suggest any other method for analysing local stresses at pipe support.
Thanks and regards
Waheed
In 5th edition of the book, the coefficient for 3rd equation is "-1" while in 6th edition it is -1.56. I wonder if any body have the original paper these equations have been taken from and confirm which coefficient is correct.
Could some body suggest any other method for analysing local stresses at pipe support.
Thanks and regards
Waheed





RE: Local stresses in pipe at support
Waheed
RE: Local stresses in pipe at support
RE: Local stresses in pipe at support
Many years later (but still a quarter century ago!) I assisted in some laboratory work for a rather detailed research program that looked at the specific wall response of another type of metallic pipe material, utilizing at least more expensive/at the time modern if not at least equally effective instrumentation etc.!
In any case, I believe an outgrowth of work over many decades involving at least steel water pipes is now ensconced in Chapter 7 "Supports for Pipe" of AWWA Manual M11, "Steel Pipe – A Guide for Design and Installation" if this would be of interest to you.
RE: Local stresses in pipe at support
Part of your question was "did anyone have the original paper."
Does Roark provide a reference to the papers (most books do). If you post the particular reference it might help getting a copy.
Did you contact the publisher and ask why the value changed? Often a publisher will forward this type of question to the author(s). That would give you the most authoritative answer.
Patricia Lougheed
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RE: Local stresses in pipe at support
RE: Local stresses in pipe at support
RE: Local stresses in pipe at support
RE: Local stresses in pipe at support
Much easier to use FE/Pipe suite of software so maybe I am REALLY getting lazy in my olde age
John
RE: Local stresses in pipe at support
I think even quite earlier in that century other testing was conducted, even with cast iron (pipe) shells loaded on supports, and even involving e.g. buried earth simulations and other conditions at Iowa State College (later to become ISU, my alma mater) and later some maybe also at U. Illinois-Champaign Urbana.
[You may see some other testing etc. references noted e.g. on page 57 of the book that can be viewed in part at http://