This paper presents details on the load bearing capacity of pipelines subjected to combined loading (internal pressure, axial and bending load) based on the findings of a recent research project of the European Pipeline Research Group (EPRG). Firstly, the failure mechanisms of line pipe under combined loading, which depend on local geometry, material characteristics as well as local and global applied loading, are characterized. Afterwards, differences between laboratory testing and the real-life situation of pipelines subjected to combined loading are described. Here, optimal boundary conditions for realistic testing are defined. Finally, a large variety of modelling approaches, specifically dedicated to combined loading experimental data from 59 full-scale tests on line pipe joints have been analysed. The relevant parameters in the analysis of buckling behavior of the pipes were: actual material properties, boundary conditions, failure phenomena and strain at failure, with the final aim to issue recommendations with regard to the selection of modelling approaches, sensitivity towards input parameters as well as strain threshold values. For the prediction of the limit pipe deformation a large selection of equations suggested by various authors in terms of critical bending moment, critical strain and critical stress for various loading conditions were considered. The methods differ in solution methodology (analytical vs. numerical), in the definition of material behavior (elastic, elastic-plastic) and in the definition of critical conditions and critical points. Then, the different types of buckling as a function of pipe geometry were characterized. Finally, the buckling behavior of an actual bending test was simulated using measured input data.
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2012 9th International Pipeline Conference
September 24–28, 2012
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute
- Pipeline Division
ISBN:
978-0-7918-4515-8
PROCEEDINGS PAPER
Combined Loading Capacity of Pipelines: Approaches Towards the Compressive Strain Limit
Hossein Karbasian,
Hossein Karbasian
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany
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Steffen Zimmermann,
Steffen Zimmermann
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany
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Ulrich Marewski,
Ulrich Marewski
Open Grid Europe, Essen, Germany
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Michael Steiner
Michael Steiner
Open Grid Europe, Essen, Germany
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Hossein Karbasian
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany
Steffen Zimmermann
Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany
Ulrich Marewski
Open Grid Europe, Essen, Germany
Michael Steiner
Open Grid Europe, Essen, Germany
Paper No:
IPC2012-90615, pp. 375-382; 8 pages
Published Online:
July 25, 2013
Citation
Karbasian, H, Zimmermann, S, Marewski, U, & Steiner, M. "Combined Loading Capacity of Pipelines: Approaches Towards the Compressive Strain Limit." Proceedings of the 2012 9th International Pipeline Conference. Volume 4: Pipelining in Northern and Offshore Environments; Strain-Based Design; Risk and Reliability; Standards and Regulations. Calgary, Alberta, Canada. September 24–28, 2012. pp. 375-382. ASME. https://doi.org/10.1115/IPC2012-90615
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