Stiffness of Buried FLexible Pipe
Stiffness of Buried FLexible Pipe
(OP)
I am looking for references that cover the calculation of the stiffness of a pre insulated plastic pipe material.
The ring bending moment of inertia is required as is the location of the neutral axis. From this data I rpesume one can calulate the stiffnes using the various moduli of the core, insulation and outer sheath.
Neither Moser or Watkins cover this in their buried pipeline books, no standards appear to cover this apsect either.
Has anyone in the district heating field had to do this type of design where the criteria of stress, strain, deflection, combined loading and buckling are determined for external loads such as wheel loading, impact loading superimposed loads and soil loads?
Apologies for posting on two forums but I need an answer from as many people as possible.
The ring bending moment of inertia is required as is the location of the neutral axis. From this data I rpesume one can calulate the stiffnes using the various moduli of the core, insulation and outer sheath.
Neither Moser or Watkins cover this in their buried pipeline books, no standards appear to cover this apsect either.
Has anyone in the district heating field had to do this type of design where the criteria of stress, strain, deflection, combined loading and buckling are determined for external loads such as wheel loading, impact loading superimposed loads and soil loads?
Apologies for posting on two forums but I need an answer from as many people as possible.





RE: Stiffness of Buried FLexible Pipe
RE: Stiffness of Buried FLexible Pipe
It would seem that your dealing with a beam on elastic foundation, as a pipe and a as a beam? Sounds interesting.
http:
RE: Stiffness of Buried FLexible Pipe
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Stiffness of Buried FLexible Pipe
RE: Stiffness of Buried FLexible Pipe
Thanks, I have both of these books to hand however they do not provide the information that I seek. i will end up with some non linear FEA program to undertake this matter.
DickSewerrat
Stiffness is one of the important criteria in the design of soil/pipe structures. In the design the computation of the stress, strain, buckling, deflection and combined loading criteria in undertaken.
GRP is sold under stiffness ratings as it is difficult to define the properties of such an anisotropic material.
Suggest you read AS 2566, BS7199 or ISO 14692 or the references given previously