Critical Buckling Force
Critical Buckling Force
(OP)
Hi all,
Does anyone know how to calculate the critical buckling force for a buried subsea pipeline for a given imperfection?
Just to be clear, I don't mean the effective axial force that is generated in the pipeline because of the Temp,Pressure. I mean the minimum force which causes to buckle a buried pipeline. (upheaval buckling). So it is independent to Temp./Press.
As far as I know it depends on the uplift soil resistance, download coefficient and wave length coefficient and I know all the equations!...but don't know how to find the critical buckling force for a given imperfection.
Many thanks in advance.
Does anyone know how to calculate the critical buckling force for a buried subsea pipeline for a given imperfection?
Just to be clear, I don't mean the effective axial force that is generated in the pipeline because of the Temp,Pressure. I mean the minimum force which causes to buckle a buried pipeline. (upheaval buckling). So it is independent to Temp./Press.
As far as I know it depends on the uplift soil resistance, download coefficient and wave length coefficient and I know all the equations!...but don't know how to find the critical buckling force for a given imperfection.
Many thanks in advance.





RE: Critical Buckling Force
If, as you say, you have all the equations then I'm guessing you have the already looked at Hobbs R. E. (1984): "In-Service buckling of Heated Pipelines", ASCE Journal of Transportation Engineering,vol. 110, pp 175-189 as this will give you the basis of your critical buckling force for a certain prop-type...if not, a very old scanned copy is attached.
RE: Critical Buckling Force
By the way I could get the answer just by using MathCAD to solve the equations.
Cheers
RE: Critical Buckling Force
Don't forget to keep in mind that whatever equations you are using are based on very specific shapes for the imperfections.